VICTRON GX TOUCH 50 Battery Monitor Manual

ENGLISH

Cerbo GX Manual

Cerbo GX Manual

Table of Contents

1. Introduction ............................................................................................................................. 4

1.1. What is the Cerbo GX? ..................................................................................................... 4

1.2. What's in the box? ........................................................................................................... 4

2. Installation .............................................................................................................................. 5

2.1. Overview of connections .................................................................................................... 5

2.2. Power ......................................................................................................................... 5

2.3. GX Touch Screen ............................................................................................................ 6

2.4. Connecting Victron products ............................................................................................... 8

2.4.1. Multis/Quattros/Inverters (VE.Bus products) ................................................................... 8

2.4.2. Battery Monitor BMV-700 series; and MPPTs with a VE.Direct port ......................................... 9

2.4.3. Skylla-i, Lynx Shunt VE.Can, Lynx Ion + Shunt and MPPTs with a VE.Can port .......................... 9

2.4.4. BMV-600 series .................................................................................................. 10

2.4.5. DC Link box ...................................................................................................... 10

2.4.6. VE.Can Resistive Tank Sender Adapter ...................................................................... 10

2.5. NMEA Tank senders from other manufacturers ........................................................................ 10

2.6. Connecting a PV Inverter ................................................................................................. 10

2.7. Connecting a USB GPS .................................................................................................. 11

2.8. Connecting a Fischer Panda Generator ................................................................................ 11

2.9. Connecting NMEA 2000 tank senders .................................................................................. 11

2.10. Connecting IMT Solar Irradiance, Temperature and Wind Speed Sensors ....................................... 11

2.10.1. Data Visualisation - VRM ..................................................................................... 15

2.11. Connecting Temperature Sensors ...................................................................................... 16

2.12. Connecting Tank Level Sensors ........................................................................................ 16

3. Internet connectivity ................................................................................................................. 17

3.1. Ethernet LAN port ......................................................................................................... 17

3.2. Wi-Fi ........................................................................................................................ 17

3.3. GX GSM .................................................................................................................... 18

3.4. Mobile (cellular) network using a 3G or 4G router ..................................................................... 18

3.5. USB tethering using a mobile phone .................................................................................... 18

3.6. IP Configuration ........................................................................................................... 19

3.7. Connecting both Ethernet and Wi-Fi (failover) ......................................................................... 19

3.8. Minimize internet traffic ................................................................................................... 19

3.9. More information about setting up an internet connection and VRM ................................................ 20

4. Accessing the GX device ........................................................................................................... 21

4.1. Using VictronConnect via Bluetooth ..................................................................................... 21

4.2. Accessing via the built-in WiFi Access Point ........................................................................... 24

4.3. Accessing Remote Console via the local LAN/WiFi Network ........................................................ 25

4.3.1. Alternative methods to find the IP Address for Remote Console .......................................... 25

4.4. Accessing via VRM ........................................................................................................ 27

5. Configuration ......................................................................................................................... 29

5.1. Menu structure and configurable parameters .......................................................................... 29

5.2. Battery State of Charge (SOC) .......................................................................................... 33

5.2.1. Which device should I use for SOC calculation? ............................................................ 33

5.2.2. The different solutions explained in detail .................................................................... 33

5.2.3. Notes on SOC ................................................................................................... 34

5.2.4. Selecting SOC source .......................................................................................... 34

5.2.5. Details on VE.Bus SOC ........................................................................................ 36

5.3. Customize the logo on the Boat & Motorhome page .................................................................. 36

6. Updating GX Firmware .............................................................................................................. 37

6.1. Via internet or with microSD-card/USB-stick ........................................................................... 37

6.2. Direct download from the internet ....................................................................................... 37

6.3. MicroSD-card or USB-stick ............................................................................................... 37

6.4. Changelog .................................................................................................................. 38

7. VE.Bus Inverter/charger monitoring ............................................................................................... 39

7.1. Input current-limiter setting ............................................................................................... 39

7.2. Phase rotation warning ................................................................................................... 40

7.3. Grid failure monitoring .................................................................................................... 41

7.4. Advanced menu ........................................................................................................... 41

8. DVCC - Distributed Voltage and Current Control ................................................................................ 43

8.1. Introduction and features ................................................................................................. 43

8.2. DVCC Requirements ...................................................................................................... 44

8.3. DVCC effects on the charge algorithm .................................................................................. 44

8.4. DVCC features for all systems ........................................................................................... 45

8.4.1. Limit charge current ............................................................................................. 45

8.4.2. Shared Voltage Sense (SVS) .................................................................................. 45

8.4.3. Shared Temperature Sense (STS) ............................................................................ 46

2

Cerbo GX Manual

8.4.4. Shared Current Sense (SCS) .................................................................................. 46

8.5. DVCC Features when using CAN-bus BMS Battery .................................................................. 46

8.6. DVCC for systems with the ESS Assistant ............................................................................. 47

9. VRM Portal ........................................................................................................................... 48

9.1. VRM Portal Introduction .................................................................................................. 48

9.2. Registering on VRM ....................................................................................................... 48

9.3. Datalogging to VRM ....................................................................................................... 48

9.4. Trouble shooting data logging ............................................................................................ 49

9.5. Analysing data offline, without VRM ..................................................................................... 52

9.6. Remote Console on VRM - Trouble shooting .......................................................................... 52

10. Marine MFD integration by App .................................................................................................. 54

10.1. Introduction & requirements ............................................................................................ 54

10.2. Compatible MFDs and instructions .................................................................................... 55

11. Marine MFD integration by NMEA2000 .......................................................................................... 56

11.1. NMEA2000 Introduction ................................................................................................. 56

11.2. Supported Devices / PGNs ............................................................................................. 56

11.3. NMEA2000 Related menu settings .................................................................................... 57

11.4. NMEA2000-out technical details ....................................................................................... 58

11.4.1. NMEA2000 Glossary .......................................................................................... 58

11.4.2. NMEA2000 Virtual-devices35 (Electrical generation) ...................................................... 58

11.4.3. NMEA2000 Classes and functions ........................................................................... 58

11.4.4. NMEA2000 Instances ......................................................................................... 58

11.4.5. NMEA2000 Changing Instances ............................................................................. 59

11.4.6. PGN 60928 NAME Unique Identity Numbers ............................................................... 60

12. Digital Inputs ........................................................................................................................ 61

12.1. Configuration ............................................................................................................. 61

12.2. Read-out of digital inputs via Modbus-TCP ........................................................................... 62

13. Error Codes ......................................................................................................................... 63

14. FAQ .................................................................................................................................. 64

14.1. Cerbo GX FAQ ........................................................................................................... 64

14.2. Q2: Do I need a BMV to see proper battery state of charge? ....................................................... 64

14.3. Q3: I have no internet, where can I insert a sim-card? .............................................................. 64

14.4. Q4: Can I connect both a GX Device and a VGR2/VER to a Multi/Inverter/Quattro? ............................ 64

14.5. Q5: Can I connect multiple Color Controls to a Multi/Inverter/Quattro? ........................................... 64

14.6. Q6: I see incorrect current (amps) or power readings on my Cerbo GX ........................................... 64

14.7. Q7: There is a menu entry named "Multi" instead of the VE.Bus product name .................................. 65

14.8. Q8: There is a menu entry named "Multi", while there is no Inverter, Multi or Quattro connected .............. 65

14.9. Q9: When I type the ip-address of the Color Control into my browser, I see a web page mentioning Hia-

watha? ........................................................................................................................... 65

14.10. Q10: I have multiple Solar chargers MPPT 150/70 running in parallel. From which one will I see the

relay status in the Cerbo GX menu? ......................................................................................... 65

14.11. Q11: How long should an automatic update take? .................................................................. 65

14.12. Q12: I have a VGR with IO Extender, how can I replace this with a Cerbo GX? ................................ 65

14.13. Q13: Can I use Remote VEConfigure, as I was doing with the VGR2? .......................................... 65

14.14. Q14: The Blue Power Panel could be powered through the VE.Net network, can I also do that with a

Cerbo GX? ...................................................................................................................... 66

14.15. Q15: What type of networking is used by the Cerbo GX (TCP and UDP ports)? ............................... 66

14.16. Q16: What is the functionality behind the menu item Remote support (SSH), in the Ethernet menu? ....... 66

14.17. Q17: I don’t see support for VE.Net products in the list, is that still coming? .................................... 66

14.18. Q18: What is the data usage of the Cerbo GX? .................................................................... 67

14.19. Q19: How many AC Current Sensors can I connect in one VE.Bus system? ................................... 67

14.20. Q20: Issues with Multi not starting when Cerbo GX is connected / Caution when powering the Cerbo

GX from the AC-out terminal of a VE.Bus Inverter, Multi or Quattro ...................................................... 67

14.21. Q21: I love Linux, programming, Victron and the Cerbo GX. Can I do more? ................................... 68

14.22. Q22: How do I change the logo ....................................................................................... 68

14.23. Q23: Multi restarts all the time (after every 10sec) ................................................................. 68

14.24. Q24: What is Error #42? ............................................................................................... 68

14.25. GPL Note ............................................................................................................... 69

15. More information ................................................................................................................... 70

3

Cerbo GX Manual

1. Introduction

1.1. What is the Cerbo GX?

The Cerbo GX sits at the heart of your energy installation. All the other system-components - such as inverter/chargers, solar
chargers, and batteries - are connected to it. The Cerbo GX ensures that they all work in harmony.

There is an optional touch screen accessory for the Cerbo GX called the GX Touch.

Monitoring of the system can be done either with the Cerbo GX in front of you - or from anywhere in the world using an internet
connection and the VRM Portal.

The Cerbo GX also provides Remote firmware updates and allows settings to be Changed Remotely.

The Cerbo GX is part of the GX product family. GX products are Victron's state-of-the-art monitoring solution that run our Ve­nus OS operating system.

All the information in this manual refers to the latest software. You can check your device has the latest version in the Firmware

menu [29] when the GX device is connected to the internet. For installations without internet, you can find the latest version in
Victron Professional.

1.2. What's in the box?

• Cerbo GX device

• Power cable with inline fuse and M8 terminal eyes for battery or DC busbar-attachment.

• VE.Can terminators (2 pcs)

• Terminal Blocks for all the connectors on each side.

• Watch this Video for an unboxing and overview of the interfaces.

https://www.youtube.com/embed/3wheKaU2_qw

4

2. Installation

CAN

4 x Digital inputs

Door Alarm

Bilge pump

Bilge alarm
Burglar alarm
Smoke alarm

Fire alarm

CO2 alarm

Generator running

5V max – not isolated

4 x Temperature

inputs

4 x Resistive

tank level inputs

2 x Potential Free Relays
Generator start/stop, alarm signaling, remote control switch

Cerbo GX power

from battery

VE.Bus RJ-45

Digital Multi Control GX

Multi

MultiPlus

MultiPlus-II

Quattro

VE.Bus Phoenix Inverter

Networking

Modbus TCP,

Internet connectivity

Ethernet

3 x VE.Direct ports

BMV & SmartShunt

SmartSolar & BlueSolar MPPT

VE.Direct inverter, charger, peak power pack

GX Touch 50 touchscreen display

HDMI

USB

RS485 Energy meter, IMT

solar irradiation, wind and

temperature sensor

3 x USB ports

GX GSM

RS485 to USB interface

USB hubs

WIFI dongles

Keyboard

USB GPS modules

USB memory

VE.Can RJ-45

BMS-Can Cable Type A or B

Victron Compatible Battery Management Systems

Bluetooth connection

& built in WIFI to

VictronConnect app

with Remote Console

SmartSolar MPPT VE.Can

VE.Can RJ-45

Lynx Shunt VE.Can

RS inverter

Skylla-i, Skylla-S charger VE.Can

Internet router

MicroSD card
firmware updates
data logging

VE.Can

terminator

WIFI & Bluetooth on/off

reset network

button

500 kbps

Managed Battery BMS

VRM &
Remote
Support

Compatible

AC PV inverter

Compatible

Marine MFD

To Marine

NMEA2000 Network

VE.Can to

NMEA2000

adapter

RS485
to
USB

2.1. Overview of connections

Cerbo GX Manual

On the Cerbo GX, the USB socket closest to the HDMI connector can only be used to power a GX Touch. That USB port can not
be used for any data related functions such as VE.Direct to USB cables, USB-sticks, USB-GPS-es, or other common USB usa­ges. It’s a power port only, no data.

2.2. Power

The device is powered by using the Power in V+ connector. It accepts 8 to 70 V DC. The device will not power itself from any of
the other connections (eg network). The supplied DC power cable includes an inline 3.15 A slow blow fuse.

If the DC voltage exceeds 60V, the Cerbo GX is classified as a “built-in product”. Installation should be in such a way the user
cannot touch the terminals.

Powering in systems with VE.Bus BMS

When the Cerbo GX is used in an installation with a VE.Bus BMS, connect the Power in V+ on the Cerbo GX to the terminal
labelled 'Load disconnect' on the VE.Bus BMS. Connect both negative leads to the negative stub of a common Battery.

A Cautionary word about Powering from the AC-out terminal of a VE.Bus Inverter, Multi or Quattro:

If you power the Cerbo GX from an AC adaptor connected to the AC-out port of any VE.Bus product (Inverter, Multi or Quattro),
then a deadlock will occur after the VE.Bus products are powered-down for any reason (after any operational fault or during a
black start). The VE.Bus devices will not boot-up until the Cerbo GX has power …but the Cerbo GX will not boot-up until it has
power. This deadlock can be rectified by briefly unplugging the Cerbo GX VE.Bus cable at which point you will observe the
VE.Bus products will immediately begin to boot-up.

Or a modification can be done to the RJ45 cabling. See FAQ Q20 [67]for more information about this.

5

Cerbo GX Manual

Note that both with or without above modification, powering the monitoring equipment with the AC-out of an inverter/charger (of­course) has the disadvantage that all monitoring is shut down when there is a problem that causes the inverter/charger to shut
down. Examples are Inverter overload, high temperature or low battery voltage. It is therefore recommended to power the GX
device from the battery.

Isolation

Because the Cerbo GX is connected to many different products, please ensure that proper care is taken with isolation to prevent
ground loops. In 99% of installations this will not be a problem.

• The VE.Bus ports are isolated

• The VE.Direct ports are isolated

• The VE.Can ports are not isolated.

• The USB ports are not isolated. Connecting a Wi-Fi Dongle or GPS Dongle will not create a problem as it is not connected to
another power supply. Even though there will be ground loop when you mount a separately-powered USB hub, during exten­sive testing we have not found that it caused any issues.

• The Ethernet port is isolated, except for the shield: use unshielded UTP cables for the Ethernet network

Extending USB ports by use of a self-powered USB hub

Although the number of USB ports can be extended by using a hub, there is a limit to the amount of power that the onboard USB
port can provide. When extending the number of USB ports, we recommend you always use powered USB hubs. And to minimize

the chance of issues, be sure to use good-quality USB hubs. As Victron also offers a VE.Direct to USB adapter, you can use this
arrangement to increase the number of VE.Direct devices you can connect to your system, please see this document for the limit
of how many devices can be attached to various different GX devices.

2.3. GX Touch Screen

The optional touch screen accessory is connected via HDMI and USB cable and plugs that are supplied as part of the screen.

The ports to connect these plugs are located on the top of the Cerbo GX. See Overview of connections diagram. [5]

No configuration is required. When the screen is connected, the device will automatically display the GX overview and menu con­trols.

Display options are available in the Settings - Display and Language menu. You can set a time before the display turns off, or
enable adaptive brightness.

The screen is controlled by a finger tip. You can swipe to scroll up and down through the menus, and tap to make selections.

Text and number input is entered via an onscreen keyboard -

6

Cerbo GX Manual

It is possible to mount the GX Touch in several different ways, using the included bracket frames.

7

Cerbo GX Manual

2.4. Connecting Victron products

2.4.1. Multis/Quattros/Inverters (VE.Bus products)

In order to keep this document short we are going to refer to all Multis, Quattros and Inverters as VE.Bus products.

The earliest version of the VE.Bus devices which can be connected to the Cerbo GX is 19xx111 or 20xx111, which were released
in 2007. VE.Bus firmware 26xxxxx and 27xxxxx are also supported …but 18xxxxx is not.

Note that it is not possible to use the Remote On/Off (header on the VE.Bus control PCB) in combination with a Cerbo GX. There
should be wire between the left and middle terminal, as it is when shipped from the factory. In case a wired switch that disables
the system is required, use the Safety Switch Assistant.

Single VE.Bus products

To connect a single VE.Bus product, connect it to one of the VE.Bus sockets on the back of the Cerbo GX. Both sockets are
identical, use either one. Use a standard RJ45 UTP cable, see our pricelist.

Parallel, split- and three-phase VE.Bus systems

To connect multiple VE.Bus products, configured as a parallel, split-phase or three phase VE.Bus system, connect either the first
or the last VE.Bus product in the chain to either one of the VE.Bus sockets on the back of the Cerbo GX. Use a standard RJ45
UTP cable, see our pricelist.

VE.Bus systems with Lithium batteries and a VE.Bus BMS

8

Cerbo GX Manual

• Connect the Cerbo GX to the socket labelled ‘MultiPlus/Quattro’, or to one of the Multis/Quattros in the system. Do not connect
it to the Remote panel socket on the VE.Bus BMS.

• Note that it will not be possible to control the On/Off/Charger Only switch. This option is automatically disabled in the Cerbo GX
menu when a VE.Bus BMS is used. The only way to control a Multi or Quattro when used with a VE.Bus BMS is to add a Digital
Multi Control to the system. Setting the input current limit is possible in systems with a VE.Bus BMS.

• Combining MultiPlus/Quattro with a VE.Bus BMS and a Digital Multi Control is possible. Simply connect the Digital Multi Control
to the RJ-45 socket on the VE.Bus BMS labelled Remote panel.

• To allow auto-power-down in the Cerbo GX in case of a low battery, make sure the Cerbo GX is powered via the VE.Bus BMS:
connect Power in V+ on the Cerbo GX to Load disconnect on the VE.Bus BMS. And connect both negative leads to the nega­tive stub of a common Battery.

Combining the Cerbo GX with a Digital Multi Control

It is possible to connect both a Cerbo GX and a Digital Multi control to a VE.Bus system. The ability to switch the product On, Off
or set it to Charger Only via the Cerbo GX will be disabled. The same applies to the input current limit: when there is a Digital
Multi Control in the system, the input current limit which is set at that control panel will be the master-setting, and changing it on
the Cerbo GX will not be possible.

Connecting multiple VE.Bus systems to a single Cerbo GX

Only one VE.Bus system can be connected to the VE.Bus ports on the back of the Cerbo GX. The professional way to to monitor
more systems is to add a second Cerbo GX

If you do require to connect more than one system to the same Cerbo GX, use an MK3-USB. Functionality will be limited:

• Only the system connected to the built-in VE.Bus ports is used to generate the data on the Overview pages.

• All connected systems will be visible on the Device-list

• All connected systems will be taken into account for Energy consumption and distribution calculations (kWh graphs on VRM)

• Only the system connected to the built-in VE.Bus ports is used for the Generator start/stop logic

• In case of an ESS system, only the system connected to the built-in VE.Bus ports is used in the ESS mechanisms. The other
one is displayed in the device list only.

Alternatively the VE.Bus to VE.Can interface (ASS030520105) can be used. Add one for each additional system. Note that we
advise against it; this interface is a deprecated product. Make sure that the VE.Can network is terminated and powered. For pow­ering the VE.Can network, see Q17 in our data communication whitepaper.

2.4.2. Battery Monitor BMV-700 series; and MPPTs with a VE.Direct port

Direct connection via a VE.Direct cable is limited to the number of VE.Direct ports on the device (see Overview of Connections

[5]). There are two types of VE.Direct cable available:

1. Straight VE.Direct cables, ASS030530xxx

2. VE.Direct cables with an angled connector on one end. These are designed to minimize the required depth behind a panel,

ASS030531xxx

VE.Direct cables have a maximum length of 10 metres. It is not possible to extend them. If longer lengths are required, use a
VE.Direct to USB adapter with an active USB extension cable.

It is also possible to use the VE.Direct to VE.Can interface, but note that this only works for BMV-700 and BMV-702. Not for the
BMV-712, MPPT solar chargers and Inverters with a VE.Direct port. See next paragraph for more information on that VE.Can
interface.

Connecting more VE.Direct devices to your Cerbo GX than number of VE.Direct Ports

First of all, note that the maximum of VE.Direct devices that can be connected, regardless of the interface is limited. How they are
connected, either direct, via USB or via CAN, does not change the maximum. See here for the maximum connected device limits.
Select the correct GX device for the number of connected devices required by the system.

• Option 1: Use the VE.Direct to USB interface. The Cerbo GX has built-in USB ports (see Overview of Connections [5]). Use a
USB-hub when additional USB ports are required.

• Option 2: The BMV-700 and BMV-702 can also be connected using the VE.Direct to VE.Can interface. Note that the BMV-712,
MPPTs and VE.Direct Inverters cannot be connected using this CAN-bus interface as it does not translate the data into CAN­bus messages. When using the VE.Direct to VE.Can interface, make sure that the VE.Can network is terminated, and also
powered. For powering the VE.Can network, see Q17 in our data communication whitepaper.

Notes about older VE.Direct MPPTs

• An MPPT 70/15 needs to be from year/week 1308 or later. Earlier 70/15s are not compatible with the Cerbo GX , and unfortu­nately upgrading the MPPT firmware will not help. To find the year/week number of your model, look for the serial number
which is printed on a label on its back. For example number HQ1309DER4F means 2013, week 09.

2.4.3. Skylla-i, Lynx Shunt VE.Can, Lynx Ion + Shunt and MPPTs with a VE.Can port

To connect a product with a VE.Can port, use a standard RJ45 UTP cable. (Available with straight and elbow connectors)

9

Cerbo GX Manual

Don't forget to terminate the VE.Can network at both ends using a VE.Can terminator. A bag with two terminators is supplied with
each VE.Can product. They are also available separately.

Other notes:

1. In order to work with the Cerbo GX an MPPT 150/70 needs run firmware v2.00 or newer.

2. You can combine a Skylla-i control panel with a Cerbo GX.

3. You can combine a Ion Control panel with a Cerbo GX.

4. The Skylla-i, Lynx Shunt VE.Can, Lynx Ion + Shunt and the MPPTs with a VE.Can port all power the VE.Can network …so it

won't be necessary to power the VE.Can network separately in these circumstances. All the protocol converters - for example
the VE.Bus to VE.Can interface; and the BMV to VE.Can interface, do not power the VE.Can network.

2.4.4. BMV-600 series

Connect the BMV-600 using the VE.Direct to BMV-60xS cable. (ASS0305322xx)

2.4.5. DC Link box

Connect the DC Link box, using the RJ-12 cable supplied. Then connect the BMV-700 to the Cerbo GX - see connecting
BMV-700 for more instructions.

2.4.6. VE.Can Resistive Tank Sender Adapter

See its page and manual on our website for details about the Adapter.

To connect a product with a VE.Can port, use a standard RJ45 UTP cable.

Don't forget to terminate the VE.Can network on both ends using a VE.Can terminator. A bag with two terminators is supplied with
each VE.Can product. They are also available separately (ASS030700000). (Available with straight or elbow connectors.)

Make sure that the CAN-bus is powered, see the Power chapter in the Tank Sender Adapter manual for details.

2.5. NMEA Tank senders from other manufacturers

A tank sender must meet the following requirements to be visible on the Cerbo GX :

•

Transmit the NMEA 2000 Fluid Level PGN, 127505

• The NMEA 2000 device class needs to be 'General', 80

• The NMEA 2000 function needs to be 'Transducer', 190

Since v2.17 the following functions are accepted as well:

• The NMEA 2000 device class 'General', 80 and function 'Sensor', 170

• The NMEA 2000 device class 'Sensors', 75 and function 'Fluid Level', 150

A single function reporting multiple Fluid Levels is currently not supported.

For some tank senders it is also possible to configure the capacity and the fluid type from the Cerbo GX - for example the Mare­tron TLA100. This facility may be available with other senders made by other manufacturers - it's well-worth trying.

To connect an NMEA 2000 network to the VE.Can port on the Cerbo GX , use a VE.Can to NMEA2000 cable.

Alternatively, instead of a VE.Can to NMEA 2000, you can use a 3802 cable from Oceanic Systems: https://osukl.com/ve-can-

adaptor/. The difference is that it lends itself well to connecting a single NMEA 2000 device into a VE.Can network. It's also able

to power a lower voltage NMEA 2000 network directly from a 48V Victron system.

2.6. Connecting a PV Inverter

Measuring the output of a PV Inverter will provide the user with an overview of both actual power balance and the energy distribu­tion. Note that these measurements are only used to display information. They are not needed, nor used, by the installation for its
performance. Besides monitoring, the GX device can also curtail some types and brands of PV Inverters, ie. reduce their output
power. This is used, and required, for the ESS Zero feed-in feature.

Direct connections

Type Zero feed-in Details

Fronius Yes LAN Connection, see GX - GX - Fronius manual

SMA No LAN Connection, see GX - GX - SMA manual

SolarEdge No LAN Connection, see GX - SolarEdge manual

ABB Yes LAN Connection, see GX - ABB manual

Using a meter For PV Inverters that cannot be interfaced digitally, a meter can be used:

10

Cerbo GX Manual

Type Zero feed-

AC Current Sensor No Connected to inverter/charger analog input. Lowest cost - least accurate. Energy Meter

Energy Meter No Wired to the Cerbo GX, or connected wirelessly using our Zigbee to USB/RS485 interfaces. See the Energy Me-

Wireless AC sensors No See the Wireless AC Sensor manual - Discontinued

in

ters start page

Details

2.7. Connecting a USB GPS

Use a GPS to track remote vehicles or boats and, optionally, get an alarm when they leave a designated area (geofencing). It is
also possible to download a gps-tracks.kml file which can be opened with Navlink and Google Earth for example.

Victron does not sell USB-GPS, but the Cerbo GX will support third-party GPS modules which use the NMEA0183 command-set ­almost all do. It can communicate at both 4800 and 38400 baud rates. Plug the unit into either of the two USB sockets …connec­tion may take a few minutes, but the Cerbo GX will automatically recognize the GPS. The unit's location will automatically be sent
to the VRM online portal and its position shown on the map.

The Cerbo GX has been tested for compatibility with:

• Globalsat BU353-W SiRF STAR III 4800 baud

• Globalsat ND100 SiRF STAR III 38400 baud

• Globalsat BU353S4 SiRF STAR IV 4800 baud

• Globalsat MR350 + BR305US SiRF STAR III 4800 baud

2.8. Connecting a Fischer Panda Generator

See GX - Fischer Panda generators.

2.9. Connecting NMEA 2000 tank senders

A third party NMEA 2000 tank sender must meet the following requirements to be visible on the GX Device:

• Transmit the NMEA 2000 Fluid Level PGN, 127505

• The NMEA 2000 device class needs to either General (80) in combination with function code Transducer (190), or Sensor
(170). Or, the NMEA 2000 device class needs to be Sensors (75), in combination with function Fluid Level (150).

A single function reporting multiple Fluid Levels is currently not supported.

For some tank senders it is also possible to configure the capacity and the fluid type on the GX Device - for example the Maretron
TLA100. This facility may be available with other senders made by other manufacturers - it's well-worth trying.

To connect an NMEA 2000 network to the VE.Can port on the Cerbo GX , use a VE.Can to NMEA2000 cable.

Alternatively, instead of a VE.Can to NMEA 2000, you can use a 3802 cable from Oceanic Systems: https://osukl.com/ve-can-

adaptor/. The difference is that it lends itself well to connecting a single NMEA 2000 device into a VE.Can network. It's also able

to power a lower voltage NMEA 2000 network directly from a 48V Victron system.

Tested NMEA2000 tank senders:

• Maretron TLA100

• Maretron TLM100

• Navico Fluid Level Sensor Fuel-0 PK, partno. 000-11518-001. Note that this sender requires a 12V powered NMEA 2000 net­work; it breaks when connected to a 24V-powered NMEA 2000 network. And note that you need a Navico display to configure
the Capacity, Fluid type, and other parameters of the sensor.

Most likely others work as well. If you know of one working well, please edit this page -or- get in touch with us on Community ->

Modifications.

2.10. Connecting IMT Solar Irradiance, Temperature and Wind Speed Sensors

Compatibility

Ingenieurbüro Mencke & Tegtmeyer GmbH (IMT) offer a range of digital silicon irradiance sensor models within the Si-RS485 ser-

ies that are all compatible with a Victron GX device.

The optional/additional external module temperature, ambient temperature and wind speed sensors are also supported.

Optional/additional external sensors are either connected to the solar irradiance sensor with pre-installed plugs or pre-wired to the
solar irradiance sensor (external module and ambient temperature only). When external sensors are connected via an appropri­ate solar irradiance sensor, all measurement data is transmitted to the Victron GX device with the single interface cable.

Each model solar irradiance sensor within Si-RS485 series has a different capability with regards to external sensors (or comes
with an external sensor pre-wired), so carefully consider any future desires/requirements before initial purchase.

11

Cerbo GX Manual

It is also possible to connect an independent IMT Tm-RS485-MB module temperature sensor (visible as ‘cell temperature’) or IMT

Ta-ext-RS485-MB ambient temperature sensor (visible as ‘external temperature’) directly to the Victron GX device, without a solar

irradiance sensor or in addition to one.

Operation

The IMT Si-RS485 series solar irradiance sensors operate using RS485 electrical interface and Modbus RTU communication pro­tocol.

The required interface software is pre-installed within the Venus OS, however the Victron GX device must be running recent firm­ware - FW v2.40 is the minimum requirement.

Physical connection to the Vicron GX device is via USB port and requires a Victron RS485 to USB interface cable.

A suitable external DC power source (12 to 28 VDC) is also required - the sensor is NOT powered via USB.

Wiring Connections

The schematic in the installation guide below depicts the wiring configuration in a typical installation.

Wire connections

Si-Sensor Victron RS485 to USB interface Signal

Brown Orange RS485 Data A +

Orange Yellow RS485 Data B -

Red - Power Pos - 12 to 28 VDC

Black Power Neg/Gnd - 0 VDC

Black (thick) - Ground / Cable Shield / PE

- Red Power Pos - 5 VDC (not used)

- Black Power Neg/Gnd - 0 VDC (not used)

Brown Terminator 1 - 120R (not used)

Green Terminator 2 - 120R (not used)

Installation Notes

12

Cerbo GX Manual

The maximum DC power supply voltage permitted for the IMT Si-RS485 series solar irradiance sensor range is 28.0 VDC - ac­cordingly for 24 V and 48 V battery banks/systems an appropriate Victron DC-DC converter (24/12, 24/24, 48/12 or 48/24) or AC­DC adaptor must be utilised in the installation.

For 12 V battery banks/systems the IMT Si-RS485 series solar irradiance sensor range may be powered directly from the battery
bank and will continue to operate down to minimum voltage of 10.5 V (as measured at the sensor, account for voltage drop in the
cable).

For detailed wiring/installation notes and specifications refer to the IMT Si-RS485 series solar irradiance sensor 'Quick Reference

Guide' and Victron RS485 to USB interface cable ‘Datasheet’.

To ensure signal integrity and robust operation, particularly ensure that;

• Extension cabling complies with the minimum cross-sectional area specifications in the related table - dependent on DC supply
voltage and cable length

• Extension cabling has appropriate shielding and twisted pair cores

• The original cable attached to the Victron RS485 to USB interface is reduced to a maximum length of 20cm in installations
where the total cable length is over 10m or there are installation/site specific interference issues – in this case appropriate/high
quality cabling should be used for the entire cable length, rather than only for the extension length

• Cabling is installed separated/away from the main DC or AC power cabling

• All wiring is properly terminated (including unused wires) and properly isolated from weather/water ingress

• The sensor housing is not opened or tampered with during installation - as sealing integrity will be compromised (and warranty
void)

The IMT Si-RS485TC series solar irradiance sensor includes internal Galvanic Isolation (up to 1000V) between power supply and
RS485 Modbus circuits, accordingly the non-isolated Victron RS485 to USB interface is suitable for most installations.

However, if an isolated RS485 to USB interface is preferred the only compatible device is Hjelmslund Electronics USB485-

STIXL (any others type will not be recognised by the GX device).

Multiple Sensors

It is possible to connect multiple IMT Si-RS485 series solar irradiance sensors to a common Victron GX device, however a dedi­cated Victron RS485 to USB interface is required for each individual unit.

Multiple units cannot be combined on a single interface (as this is not supported by the related Venus OS software).

Configuration

There is normally no need for any special/additional configuration – the default ‘as shipped’ configuration is compatible for com­munication with a Victron GX device.

However, in cases where the IMT Si-RS485 series solar irradiance sensor has been previously used in another system and/or the
settings changed for any reason, it is necessary to restore the default configuration before further use.

To revise the configuration, download the IMT 'Si-MODBUS-Configuration software tool'. Follow the instructions in the IMT ‘Si

Modbus Configurator Documentation’. and check/update the following settings:

• MODBUS Address: 1

• Baud Rate: 9600

• Data Format: 8N1 (10 Bit)

For further support related to configuration of the IMT Si-RS485 Series irradiance sensors please contact IMT Solar directly.

User Interface - GX Device

Upon connection to the Victron GX device and power up the IMT Si-RS485 Series irradiance sensor will be automatically detec­ted within a few minutes and appear in the 'Device List' menu.

13

Cerbo GX Manual

Within the ‘IMT Si-RS485 Series Solar Irradiance Sensor’ menu all available parameters will be automatically displayed (depend­ent on the sensors connected) and update in real time.

Within the ‘Settings’ sub-menu it is possible to manually enable and disable any optional/additional external sensors that are con­nected to the IMT Si-RS485 Series irradiance sensor.

14

Cerbo GX Manual

2.10.1. Data Visualisation - VRM

To review logged historical data on the VRM portal, expand the ‘Meteorological Sensor’ widget list and select the ‘Meteorological
Sensor’ widget.

15

Cerbo GX Manual

Data from all available sensor types will be automatically displayed in the graph. Individual sensors/parameters can also be disa­bled/enabled by clicking on the sensor name/legend.

2.11. Connecting Temperature Sensors

See the Connection Overview [5] for the location and number of temperature sensors.

They can be used to measure & monitor all kinds of temperature-inputs.

Temperature senders are not included. The required sensor is ASS000001000 - Temperature Sensor QUA/PMP/Venus GX.

(Note that this is different to the BMV temperature accessory.)

2.12. Connecting Tank Level Sensors

See the Connection Overview [5]for the location and number of tank level sensor inputs.

The tank level inputs are resistive and should be connected to a resistive tank sender. Victron does not supply tank senders.

The tank level ports can each be configured to work with either European (0 - 180 Ohm); or US tank senders (240 - 30 Ohm).

16

Cerbo GX Manual

3. Internet connectivity

Connect the Cerbo GX to the internet to get all the advantages of the VRM Portal. The Cerbo GX sends data from all connected
products to the VRM portal - from where you can monitor energy usage, view the current status of connected products, config­ure email alarms and download data in CSV and Excel formats.

To monitor this data from your smartphone or tablet download the iOS or Android VRM App.

In addition to remote monitoring, an active internet connection allows the Cerbo GX to regularly check for a new firmware ver­sions - which will be automatically downloaded and installed.

There are several ways to connect a Cerbo GX to the internet:

• Run a network cable between a router and the Cerbo GX Ethernet LAN port

• Connect to the router wirelessly using WiFi

• Via the mobile (cellular) network, using the GX GSM - a cellular USB modem or, with a 3G or 4G router.

• USB Tethering on a mobile phone

This video explains how to connect LAN, WiFi and a GX GSM:

https://www.youtube.com/embed/645QrB7bmvY

3.1. Ethernet LAN port

When you connect an ethernet cable between a router and Cerbo GX, the Settings -> Ethernet page of your Cerbo GX will con­firm connection.

3.2. Wi-Fi

The Cerbo GX includes built in Wi-Fi. It is also possible to connect a supported external USB Wi-Fi dongle (to increase wireless
range outside of a cabinet for example).

Using Wi-Fi it is possible to connect to WEP, WPA and WPA2 secured networks. There are four supported USB Wi-Fi dongles.
Two of them are also available from stock at Victron Energy:

• Partno. BPP900100200 - Cerbo GX WiFi module simple (Nano USB), small, low cost.

• Partno. BPP900200300 - Asus USB-N14, slightly higher cost and also better reception than the Nano USB. Supported since
software version 2.23.

WiFi modules that are no longer available, but still supported, are:

• Partno. BPP900200100 - Startech USB300WN2X2D

• Partno. BPP900100100 - Zyxel NWD2105

17

Cerbo GX Manual

• Partno. BPP900200200 - Gembird WNP-UA-002, slightly higher cost and also better reception.

Although other Wi-Fi dongles may work, they have not been tested and we do not offer support for other dongles.

The Wi-Fi menu shows the available networks. When a network is selected, it is possible to fill in the password (if the password is
not already known) to connect to the network. Setting up via WPS (Wi-Fi Protected Setup) is not supported.

When the Cerbo GX finds multiple Wi-Fi networks of which the password is known, the strongest network is selected automatical­ly. When the signal of the connected network becomes too weak, it will automatically switch to a stronger network - if it knows the
password of that network.

Wi-Fi is an inherently less reliable connection than a hardwired ethernet cable. It should always be a preference to connect via
ethernet when possible. Signal strength should always be at least 50%.

3.3. GX GSM

Please see the GX GSM Manual.

3.4. Mobile (cellular) network using a 3G or 4G router

To connect the Cerbo GX to a mobile (cellular) network, such as a 3G or 4G network, use a cellular router. Connect the Cerbo GX
to that router with either a LAN cable or the router's Wi-Fi network.

Make sure you use a router that is designed for unattended setups. Do not use low cost consumer-grade routers intended for
business or leisure travel. A more expensive professional router will quickly pay for itself, and you won't have wasted journeys
simply to perform a re-set. Examples of such professional routers are the H685 4G LTE from Proroute, as well as the Industrial

4G router range from Pepwave.

More information in this blogpost.

Note that the Cerbo GX does not support USB 3G/4G dongles, other than the GX GSM available from Victron.

3.5. USB tethering using a mobile phone

This is a useful facility when it works - but don't rely on it because it has not proved very dependable. Consult the internet for
instructions about tethering for your phone and its particular operating system. We have heard of it working on:

• Samsung Galaxy S4

…but not on:

• iPhone 5s with iOS 8.1.1

18

Cerbo GX Manual

3.6. IP Configuration

Almost no installations will need the IP address configuration to be inserted manually as most systems support automatic IP con­figuration (DHCP) - and that is also the Cerbo GX default setting. If you do need to configure the address manually, select the
following template:

Complete details of IP requirements, as well as used port numbers will be found in the VRM FAQ - ports and connections used by

the Cerbo GX.

3.7. Connecting both Ethernet and Wi-Fi (failover)

It is possible to connect the Cerbo GX to both Ethernet and Wi-Fi. In this case, the Cerbo GX will try to determine which interface
provides an active internet connection and then use that interface. When both have an active internet connection, the Ethernet
connection is used. The Cerbo GX will automatically check again for active internet connections when something changes on the
interfaces.

3.8. Minimize internet traffic

In situations where internet traffic is expensive, for example a satellite uplink or with roaming GSM/cellular charges, you may want
to minimize the internet traffic. The steps to take are:

• Disable auto-update

• Do not enable remote support

• Reduce the Logging interval to a very low frequency. Note that state changes (charging → inverting, or bulk→float) and also
alarms will cause extra messages to be sent

To find out how much data allowance you need to buy the best way is to let the system run for a couple of days and monitor the
internet RX and TX counters in your 3G or 4G router. Or even better, some mobile companies will report the data used via a
website.

The amount of data used is also very dependent on the system:

More products connected to the Cerbo GX will generate more data.

• A state change (from inverter to charger for example) will trigger a data transmission, so a system with very frequent state
changes will also tend to generate more data. This is especially true in certain Hub-1 and Hub-2 systems.

We recommend setting-up your data plan in such a way as to avoid costly 'excess' charges. Make sure you put a cap on your
data usage; or use a pre-paid plan.

One customer - burdened with global costs of between twenty cents and several euros per mb of data - invented a clever solu­tion: Using a VPN he modified the IP to route ALL traffic to and from the GX device via his VPN. Using a firewall at the VPN
server allows him to control traffic according to time, connection type, place and destinations. Although this is beyond the scope
of this manual it works, and - with the help of a Linux and networking expert - it can work for you.

19

Cerbo GX Manual

3.9. More information about setting up an internet connection and VRM

• Setting up a VRM account

• VRM Portal alarms and monitoring

• VRM Portal - Frequently asked questions

20

Cerbo GX Manual

4. Accessing the GX device

It is possible to access the GX device using either a smartphone, tablet or computer.

This access is called Remote Console. In GX devices with a display this Remote Console feature may be disabled by default and
need to be enabled. GX devices without a display have Remote Console enabled by default.

There are several ways to get access:

• Using VictronConnect via Bluetooth

• By using the built-in WiFi Access Point

• Via the local LAN/WiFi network

• Through the online VRM Portal, which requires internet

4.1. Using VictronConnect via Bluetooth

If you are just getting started for the first time with VictronConnect, you may wish to begin with the VictronConnect manual.

Load the latest version of the VictronConnect app onto your bluetooth compatible device (phone or laptop), and make sure that
bluetooth is enabled.

21

Cerbo GX Manual

Make sure that the Cerbo GX is powered on, and the Bluetooth LED is blinking.

Open the VictronConnect App within 10 meters of the Cerbo GX and wait for nearby devices to be discovered.

Once discovered, Click or Tap on the Cerbo GX.

On first connection you will be asked to enter a bluetooth PIN code - the default PIN is 000000

You will then be asked to change this insecure default PIN code to a more secure unique code. Please set your unique code, and
then put it in a safe place for passwords in case you forget.

22

Cerbo GX Manual

From the main device screen it is possible to change the networking settings, view the system on VRM, or open the Remote Con­sole.

Network settings for the Cerbo GX are set in the Cog menu.

23

Cerbo GX Manual

Note - Bluetooth functionality is limited to the features mentioned above. It is intended to be used to assist with initial connection
and networking configuration. You cannot use Bluetooth to connect to other Victron products (e.g. SmartSolar charge controllers).
For more information about how to connect other Victron products, please see Connecting Victron products [8]

4.2. Accessing via the built-in WiFi Access Point

This method requires the VictronConnect App to be installed on your smartphone, tablet or laptop.

Steps to Connect Automatically via the QR Code:

1. Locate the QR code sticker on the side of the Cerbo GX

2. Scan the QR code using your phone's camera function, or a QR code scanning app.

3. If supported by your phone, this will prompt you to connect you to the WiFi Access point.

4. Once connected, open VictronConnect

5. Select the GX device from the list

6. Open the Remote Console

Steps to Manually Connect:

1. Stand as close as possible from the Cerbo GX, and no further than a few meters away.

2. Go to the WiFi settings on your phone / tablet / laptop.

3. After searching, the Cerbo GX will show up in the list, as Venus-HQ1940DEFR4-3b6. Where HQ… is the serial number as

printed on the side of the box.

4. Connect to WiFi using the 'WiFi key' which you will find printed on the side of the box …and also on a card in the plastic bag.

Keep that in a safe place.

5. Open VictronConnect, it will start scanning the WiFi network automatically.

6. Once found, select the GX device from the list.

7. Open the Remote Console

Notes:

• If you cannot use VictronConnect, you can use a web browser and navigate to the IP address http://172.24.24.1 or http://

venus.local

• For added security it is possible to disable the WiFi Access Point. See Settings → Wi-Fi → Create access point. See below
chapter explaining the Push button for how to restore access in case ever necessary.

Instruction video

Step by step instruction video on how to connect to a GX device using the VictronConnect App.

24

Cerbo GX Manual

https://www.youtube.com/embed/aKJMXxRIkG0

Detailed instruction video

This second video was made before VictronConnect got the feature to find a device on a network. All the explanations in the
video regarding IP Addressing can be ignored, and use VictronConnect as in above video instead.

https://www.youtube.com/embed/ptYV_JEcaMU

4.3. Accessing Remote Console via the local LAN/WiFi Network

This section explains how to connected to Remote Console when the Cerbo GX is connected to the local computer network, with
either an Ethernet cable, or having it configured to connect to a local WiFi network.

This method does not require an internet connection. Just a local computer network is sufficient.

Once connected, connect to the GX Device by running the VictronConnect App on a phone, tablet or laptop. Note that will need to
be connected to the same computer network as the Cerbo GX.

This video shows how it is done

https://www.youtube.com/embed/aKJMXxRIkG0

4.3.1. Alternative methods to find the IP Address for Remote Console

In case VictronConnect can't be used, here are a few other methods to find the Cerbo GX, ie. its IP Address.

Link Local Address - Venus.local

When the Remote Console on LAN setting is enabled. A direct connection (via network cable without a router or DHCP server) is
possible. You can access the GX device by typing venus.local or http://venus.local into a web browser, or in VictronConnect when
connected to the same network. Only Enable this function on trusted networks or direct connections. Make sure you have disa­bled the password check, or set a password first.

IP Address on VRM

On the VRM Portal, you'll find the IP address on the Device List page of the installation. Note that this does require the Cerbo GX
to be connected to the internet.

25

Network (on Microsoft Windows)

Cerbo GX Manual

In a local network, for example at home, you can also find the Cerbo GX in the Windows 'Network' overview:

Double-clicking the icon will open up Remote Console on LAN.

Open the 'Properties' window to see the IP address.

26

Cerbo GX Manual

This uses Universal plug-and-play broadcast technology.

4.4. Accessing via VRM

This method requires a working internet connection, both on your phone/tablet/laptop as well as for the Cerbo GX. For a new
install, this means that it needs to be connected by Ethernet cable.

Step by step instructions:

First, connect the Cerbo GX to the internet by plugging it into a working Ethernet network which has a DHCP server, as most
networks do, and which is connected to the internet. The Cerbo GX will immediately connect to VRM.

Now, go to the VRM Portal, https://vrm.victronenergy.com/, and follow the instructions to add the device. More information about
this is available in the VRM Manual.

Then once visible on VRM, click the 'Remote Console' link to open the window. Which will look like below screenshot.

More information about 'Remote Console' on VRM is explained in the Cerbo GX Manual, VRM Remote Console chapter.

27

Cerbo GX Manual

28

Cerbo GX Manual

5. Configuration

5.1. Menu structure and configurable parameters

After completing the installation and setting up the internet connection (if required), go through the menu from top to bottom to
configure the Cerbo GX:

Item Default Description

General

Access level User and installer Set this to 'User' to prevent accidental and unwanted changes to the configuration. Installer has

Remote support No No / Yes - Enable this to allow Victron engineers to access your system in case there is a prob-

Reboot? Reboots the GX device

Audible alarm Yes When there is an alarm on the Cerbo GX or a connected product, the Cerbo GX will beep - unless

Demo mode Disabled Demonstrates product and installation features to a client or at an exhibition. This simulation

Firmware

Firmware Version x.xx Displays the currently installed firmware version

Online updates: Auto update Check only If this is Enabled, the GX device will check with the server to see if there is a new version availa-

Online updates: Update to Latest release Use the default setting unless you want to participate in test versions. End-user systems should

Install firmware from SD/USB Use this menu to install a new version from a microSD card or USB stick. Insert the card or stick

Stored backup firmware With this feature you can go back to the previously installed firmware version.

Date & time

Date/Time UTC Automatic from internet -

Date/Time local Automatic from internet When connected to the internet, time will be automatically synchronised regardless of this setting.

Change time zone Select the correct local time zone.

Remote Console - Read full feature description [21]

Disable password check Password authentication not required for remote console access.

Enable password check Choose password to allow remote console access.

Enable on VRM No No / Yes - Enabling on VRM will allow connection to the Cerbo GX from anywhere via the VRM

Remote Console on VRM - Sta­tus

Enable on LAN No No / Yes - Enabling will allow direct connection to the Cerbo GX by typing its IP address or Ve-

System setup

System name Automatic Select the system name - presets or user defined

AC input 1 Generator Select Generator, Grid or Shore power. Note additional configuration is required for complete set-

AC input 2 Grid Same choices as above.

Monitor for grid failure Disabled Monitors for loss of AC-input, and triggers an Alarm if detected. Alarm is cleared when the AC-

Battery monitor Automatic Select the SOC source. This function is useful where there is more than one BMV. More details.

Has DC system No Enable this for boats, vehicles and installations with DC loads and chargers - in addition to Multi

Marine MFD App Configuration Not set Set up what batteries you want to see on the MFD, and by what name.

DVCC - Read full feature description [43]

DVCC No Enabling DVCC changes a GX device from a passive monitor into an active controller. Default

Limit Charge Current No No / Yes - User-configurable system wide maximum charge current setting in Amps.

- Displays the connection state of the VRM Remote Console Feature, eg Online, Offline, Disabled.

additional privileges and once changed from default requires a password. Password is available
from your dealer.

lem.

this setting is set to 'Off'.

mode will allow better understanding without (yet) changing any settings. Note that this will add
simulated devices to a VRM installation. Demos for ESS, Boat and Motorhome are available.

ble. It is possible to set to disable, or update automatically

certainly be set to 'Latest release'.

that holds the new firmware .swu file.

Toggle this setting to Manually input the time where no internet connection is present.

portal. Trouble shooting Remote Console on VRM

nus.local into a web browser, or in VictronConnect when connected to the same network. Only
Enable this function on trusted networks. Disable password check, or set password first

up of these options.

input is reconnected.

and MPPT chargers. This won't be applicable to most off-grid installations; and any discrepancy
between the DC current measured by the Multi, and by the BMV, will be attributed to a 'DC sys­tem'. This may be power-in from an alternator, or power-out from a pump, for example.

A positive value indicates consumption. A negative value indicates charging, for example by an
alternator.

Note that the value shown will always be an approximation, and is affected by the variation in
sample rate between elements of the system.

setting is No, unless a compatible BMS-Can managed battery is connected, then setting is set
and locked to manufacturers specification.

29

Cerbo GX Manual

Item Default Description

SVS - Shared voltage sense No No / Yes - The GX device automatically selects the best available voltage measurement and

STS - Shared temperature
sense

Temperature sensor Automatic Select the temperature sensor to use for shared temperature sense measurement.

SCS - Shared current sense No Forwards the battery current, as measured by a battery monitor connected to the GX device, to all

SCS status Describes if SCS is enabled, or why it is disabled

Display & language

Adaptive brightness Yes Use the ambient light sensor to adjust screen brightness

Brightness Configure the brightness between 0 and 100%

Display off time Set time-to-off between 10s / 30s - 1m / 10m /30m - or never

Show mobile overview No Enable this to show the mobile overview page which is designed for Marine and Remote Vehicle

Language English Choose between English, Dutch, Chinese, German, Spanish, French, Italian, Swedish, Turkish

VRM online portal - Read full feature description [48]

Logging enabled Enabled -

VRM Portal ID - Use this value when registering the GX device onto the VRM Portal

Log interval 15 minutes Set to anything between 1 minute and 1 day. Choose longer times on systems with an unreliable

Use secure connection (HTTPS) Yes This encrypts the communication between the GX device and the VRM server.

Last contact - Time since the VRM server was last contacted.

Connection error - Displayed if there is an error in VRM communications. See here for more details on troubleshoot-

VRM two-way communication No Enable remote configuration and firmware updates.

Reboot device when no contact No The GX device will reset itself to attempt to correct a potential networking issue if the internet con-

No contact reset delay (hh:mm) 01:00 How long the unit must be offline before restarting itself

Storage location Internal storage Displays if an external storage device (eg USB drive or microSD card) is mounted, or the internal

Free disk space -

microSD/USB - Select to Safely Eject an external microSD or USB storage (if one is connected) before physically

Stored records - How many records are stored locally when no internet connection is available. The GX device will

Oldest record age - If internet/VRM is not available, then this will display the oldest record stored on the GX device.

ESS - An Energy Storage System (ESS) is a specific type of power system that integrates a power grid connection with a Victron Inverter/Charger, GX device and
battery system. Read full feature description.

Mode Optimized (with Batter-

Grid Meter Leave default when there is no External Victron grid meter is installed.

Inverter AC output in use Yes Setting this to 'No' hides the AC-out graphic in the overview pane.

Multiphase regulation - Use the Phase compensation setting in systems with a three-phase connection to the utility grid.

Minimum SOC (unless grid fails) 10% Configurable minimum SOC limit. ESS will supply loads from the grid once the SOC has fallen to

Active SOC limit 10% Use this setting to see the current BatteryLife SOC level.

BatteryLife state Self-Consumption Self-consumption, Discharge disabled, Slow charge, Sustain, Recharge

Limit charge power No This setting limits the flow of power from AC to DC for battery charging from AC-in.

Limit inverter power No Limit the power drawn by the Multi: ie. limit the power being inverted from DC to AC.

Grid setpoint 50W This sets the point at which power is taken from the grid when the installation is in self-consump-

Scheduled charging No Allows you to set up to five scheduled periods, during which the system will take power from the

Energy meters - Read full feature description

Role Grid meter Grid meter, PV inverter, Generator

Phase type Single phase

Modbus unit ID 30

PV inverters - Read full feature description

Inverters: Shows connected AC PV inverters

Inv: Position AC Input 1 AC input 1, AC input 2, AC Output

Inv: Phase L1

Inv: Show Yes

No No / Yes - The GX device will send the measured battery temperature to the Inverter/charger sys-

yLife)

shares it with other connected devices.

tem as well as all connected Solar Chargers.

connected solar chargers.

applications. This overview gives direct access to the AC Current limit as well as the On/Off/
Charger-only settings and pump control. Also shows up to four tank levels.

and Arabic.

connection. Note that this setting does not affect reporting problems and state changes (bulk →
absorption) to the VRM Portal. These events initiate an immediate transmission of all parameters.

ing VRM errors. [49]

nection is lost for the set delay period.

storage is in use.

removing it. Failure to do so can cause data loss.

store as many records as it can locally, then upload them when internet is available again.

Optimized (with BatteryLife) and Optimized (without BatteryLife), Keep batteries charged, External
control

the configured setting - except when the utility grid has failed and the system is in Inverter mode.

tion mode.

grid to charge the battery.

30

Cerbo GX Manual

Item Default Description

Find PV inverters Scan for available PV inverters

Detected IP addresses Shows the IP address of PV inverters that have been discovered

Add IP address manually If an inverter has a manually assigned IP address, you can add it directly here.

Automatic scanning Yes This setting will continue to look for PV inverters, this can be useful if using a DHCP assigned IP

Wireless AC sensors

Select the position for each AC sensor (PV Inverter on AC-input 1, 2 or on AC-output). More information about the Wireless AC sensors.

Ethernet - read full feature description [17]

State Connected

MAC address -

IP configuration Automatic

IP address -

Netmask -

Gateway -

DNS server -

Link-local IP address -

Select the configuration type (DHCP vs. manual configuration) and IP settings.

Wi-Fi- Read full feature description [17]

Create access point

Wi-Fi networks

Name

Connect to network

Forget network

Signal strength

MAC address

IP configuration

IP address

Netmask

Gateway

DNS server

Manage wireless networks and IP settings.

GSM modem - Read full feature description

Bluetooth

Enabled Yes

Pincode 000000

GPS - Read full feature description [11]

GPS information Status, Latitude, Longitude, Speed, Course, Altitude, Number of satellites

Format Select the format in which to show the Latitude and Longitude.

Speed unit km/h Choose between km/h, meters per second, miles per hour, or knots.

Device Connected, Connection, Product, Product ID, Firmware version, Device instance

Generator start/stop

Configure generator autostart settings and conditions. Read full feature description

State Displays if the generator is running or not

Error Displays if there is error (eg generator is supposed to be running but no AC input is detected)

Total run time Total time the generator has been running since reset.

Time to next test run If a periodic run is programmed, this counter will display in days, and hours how long before that

Auto start functionality Enable or Disable the Autostart functions, this can be further configured in the Generator -> Set-

Manual start Start generator, Run for hh:mm

Daily run time Submenu shows the history of time generator has been running (minutes) each day for the previ-

Generator start/stop -> Settings

Generator start/stop -> Settings -> Conditions

On loss of communication Stop generator Stop, Start, Keep generator running

Do not run generator when AC1
is in use

No This option is ideal for back-up systems where a Quattro has mains/grid electricity connected to

address that might change.

will occur.

tings -> Conditions menu

ous 30 days.

its AC-in 1 terminal, and a Genset connected to its AC-in 2 terminal. With this option enabled, the
Genset will only start after a mains failure.

31

Cerbo GX Manual

Item Default Description

Battery SOC No Use Battery SOC value to start/stop - No / Yes

Start when SOC is lower than - %

Start value during quiet hours - % (to override programmed quiet hours when absolutely necessa­ry)

Stop when Battery SOC is higher than - %

Stop value during quiet hours - % (allows for less runtime during quiet hours, once system is re­covered)

Battery current

Battery voltage

AC output

Inverter high temperature

Inverter overload

Generator start/stop -> Settings -> Conditions -> Periodic run

Periodic run No Enable - No / Yes

Generator start/stop -> Settings

Minimum run time 0 The minimum number of minutes the generator will run for any time that it is started, even after

Detect generator at AC input No No / Yes - An alarm will be triggered when no power from the generator is detected at the inverter

Quiet hours 0 Quiet hours will prevent normal generator run conditions from starting the generator. It is possible

Reset daily run time counters An option to reset generator run time counters, for example if these are used for service, or if the

Generator total run time (hours) The total time the generator has been running since the counter was reset.

Tank pump

Configure automatic starting and stopping of pump based on tank level(sender) information. Pump auto start/stop with Color Control GX

Pump state Displays if the pump is running or not

Mode Auto Options are Auto, On and Off. This is the manual override to the start and stop level triggers when

Tank Sensor Automatic Select the tank sensor that is used for the tank pump trigger. 'No tank sensor' will be displayed if

Start level 50% The trigger point of the tank level to start the tank pump (close the relay).

Stop level 80% The trigger point of the tank level to stop the tank pump (open the relay).

Relay

Function Alarm relay Select the relay function. Possible functions are 'Alarm relay', 'Generator start/stop', 'Tank pump'

Polarity Normally open Select the polarity of the relay on the back of the Cerbo GX. 'Normally open' or 'Normally closed'.

Services

ModbusTCP Off This setting enables the ModbusTCP service. More information about ModbusTCP in this docu-

MQTT on LAN (SSL) On Enables MQTT on LAN - More information on MQTT is available on Victron Community.

MQTT on LAN (Plaintext) Off This setting is required to be enabled when connecting an Marine MFD

No Use value to start/stop - No / Yess

Start when value is higher than - Amps / Voltage / Watts

Start value during quiet hours - Amps / Voltage / Watts (to override programmed quiet hours when
absolutely necessary)

Start after condition is reached for - seconds (to allow for momentary spikes to pass without trig­gering start)

Stop when value is lower than - Amps / Voltage / Watts

Stop value during quiet hours - Amps / Voltage / Watts (allows for less runtime during quiet hours,
once system is recovered)

Stop after the condition is reached for - seconds (to allow for momentary dips without stopping the
running generator)

No Start on value warning - No / Yes

Start when warning is active for - seconds (to allow for momentary spikes to pass without trigger­ing start)

When warning is cleared stop after - seconds (to allow for momentary dips without stopping the
running generator)

Run interval

Skip run if has been running for

Run interval start date

Start time

Run duration (hh:mm)

Run until battery is fully charged

stop conditions.

AC input. Make sure that the correct AC input is set to generator on the system setup page.

for some settings to specify override values to the quiet hours ( an extremely low battery voltage
trigger to prevent a system shutdown for example)

generator is replaced or majorly repaired.

a tank sensor is connected.

no tank sensor is connected or detected,

and 'None' (disabled).

(Note that setting it to normally closed increases the Cerbo GX power draw.)

ment and in the communications white paper https://www.victronenergy.com/upload/documents/
Whitepaper-Data-communication-with-Victron-Energy-products_EN.pdf

32

Cerbo GX Manual

Item Default Description

VE.Can port VE.Can CAN-bus profile (Disabled, VE.Can & Lynx Ion BMS 250 kbit/s, VE.Can & Can-bus BMS 250

BMS-Can port - CAN-bus BMS (500 kbit/s)

CAN-bus CAN-bus profile, Send data to VE.Can, Unique device number for VE.Can, Check unique num-

I/O

Analog inputs On Available tank level sensors On/Off, Available Temperature sensors On/Off

Digital inputs Off Available Digital inputs Off, Door alarm, Bilge pump, Bilge alarm, Burglar alarm, Smoke alarm,

kbit/s, CAN-bus BMS 500 kbit/s, Oceanvolt 250 kbit/s), Send data to VE.Can, Unique device num­ber for VE.Can, Check unique numbers

bers

Fire alarm, CO2 alarm, Generator

When using a VE.Bus system, it is possible to configure the severity of problems on the VE.Bus system that should cause a notifi­cation to show up on the Cerbo GX (and make it beep):

• Disabled: The Cerbo GX will never beep or show a notification

• Alarm only: The Cerbo GX will only beep and show a notification when the VE.Bus system switched off in an alarm condition.

• Enabled (default): The Cerbo GX will beep and show a notification

When all done, don't forget to change the access level to user when required.

5.2. Battery State of Charge (SOC)

5.2.1. Which device should I use for SOC calculation?

There are three products types that calculate State Of Charge (SOC). The Cerbo GX itself does not calculate SOC, it only re­trieves it from the connected devices.

The three products that calculate SOC are:

1. Battery Monitors, such as the BMVs, the Lynx Shunt, or the Lynx Ion BMS

2. Multi and Quattro inverter/chargers

3. Batteries with built-in battery monitor and a (mostly BMS-Can) connection to the Cerbo GX.

When to use what?

If you have a battery with build-in battery monitor, such as a BYD or Freedomwon battery; its easy. Use that.

If not, then the options depend on the type of system:

1. If the MultiPlus or Quattro inverter/charger is the only source of charge to the batteries and the only draw then it can function

as a basic battery monitor because it counts what went in and counts what comes out. No need for a dedicated battery moni­tor such as the BMV.

2. If the systems consists of an inverter/charger, MPPTs and a GX device, then there is still no need to add a dedicated battery

monitor.

3. For any other system types, such as a boat or vehicle with DC lights and other loads, a dedicated battery monitor will be

required.

5.2.2. The different solutions explained in detail

(A) Battery and Multi or Quattro (a typical backup system)

No battery monitor is required: the Multi or Quattro is the only product connected to the battery and has full control over all charge
and discharge currents. Therefore it can calculate the correct SOC itself.

Configuration:

1. Enable and configure the Battery Monitor in VEConfigure.

2. In the Cerbo GX , in Settings → System setup, verify the selected Battery Monitor. It should be set to the Multi or Quattro.

(B) Battery with Multi or Quattro and MPPT Solar Chargers -ALSO- An EasySolar with GX Device built-in

No battery monitor is required, as long as all MPPT Solar Chargers are Victron products and are connected to the Cerbo GX .
The Cerbo GX will continuously read the actual charge current from all solar chargers, and send the total to the Multi (or Quattro)
which then uses that information in its SOC calculations.

Configuration:

1. Enable and configure the Battery Monitor in VEConfigure.

2. On the Cerbo GX , in Settings → System setup, verify the selected Battery Monitor. It should be the Multi or Quattro.

3. In the same menu, verify that the option 'Use solar charger current to improve VE.Bus SOC' is enabled. Note that this is not a

setting - it just an indicator of an automatic process.

33

Cerbo GX Manual

Note that this feature requires recent firmware versions in both the Multis or Quattros (402 minimum), and the Cerbo GX (v2.06
minimum).

(C) Batteries with a built-in battery monitor

In cases where the system includes a battery which has a built-in battery monitor and SOC calculation - such as many of the
batteries listed here - a dedicated battery monitor is not required.

Configuration:

1. Connect the battery communications cable to the Cerbo GX according to the instructions.

2. In the Cerbo GX , in Settings → System setup, verify that the selected Battery Monitor is the battery.

Note that the Battery Monitor setting in VEConfigure3 is irrelevant. For systems like this, changing this setting will have no effect
on the charge or any other parameters in this type of system.

(D) Other system types

When there are more chargers, or loads, connected to the battery than just the Multi or MPPT Solar Chargers, a dedicated Bat­tery Monitor will be required. Examples are:

• House loads in Marine or Vehicle system.

• PWM Solar Chargers

• AC chargers, such as Skylla-is, Phoenix chargers, non Victron chargers, etc.

• Alternators

• DC-DC chargers

• Wind turbines

• Hydro turbines

In case a battery with built-in monitor is used, such as explained in (C), then that is the dedicated battery Monitor. Refer to section
(C).

Otherwise, install a BMV or Lynx Shunt VE.Can.

Configuration:

1. Configure the battery monitor as per its documentation.

2. In the Cerbo GX , in Settings → System setup, verify the selected Battery Monitor.

3. It should be the BMV or Lynx Shunt Battery Monitor.

4. Finished.

Note that the Battery Monitor setting in VEConfigure3 is irrelevant. For systems like this, changing this setting will have no effect
on the charge - or any other parameters - in this type of system.

5.2.3. Notes on SOC

• Note that this is all about showing an accurate state of charge to the user, rather than being required for an efficient system.
The SOC percentage is not used for battery charging. It is, however, required when a generator needs to be started and stop­ped automatically based on battery SOC.

More information:

VRM Portal FAQ - difference between BMV SOC and VE.Bus SOC

See Configurable Parameters Section [29] on Battery Monitor selection and Has DC System.

5.2.4. Selecting SOC source

(Settings → System Setup → Battery monitor)

In the image below you can see a range of selectable choices for the SOC values which are shown in the main Overview screen.
Choose the source you want to see on the main Overview screen of your Cerbo GX.

34

Cerbo GX Manual

In the image above we have chosen the Automatic setting. When automatic is selected the System setup screen will be as shown
in the image below.

The 'Automatic' function uses the following logic:

1. When available, it will use a dedicated Battery Monitor, such as the BMV or a Lynx Shunt, or a battery with built-in battery

monitor.

2. When there is more than one of those connected, it will use a random one - although you can select one manually.

3. when there is no dedicated Battery Monitor, it will use the VE.Bus SOC.

When should I use the 'No battery monitor' option?:

Use that in systems where:

1. there is a Multi or Quattro installed

2. no BMV or other battery monitor is installed

35

Cerbo GX Manual

3. the system has other DC loads, or other chargers, connected to the same battery, which are not connected to the Cerbo GX.

A short explanation: the VE.Bus SOC as determined by the Multi or Quattro will be incorrect in above situation. As it will not take
the discharge and charge currents by those other DC Loads, and also unmonitored chargers, into account.

5.2.5. Details on VE.Bus SOC

• While the Inverter/Charger is in bulk, the SOC will not rise above the value as set in VEConfigure3 for the “State of charge
when Bulk finished“ parameter on the General tab; default 85%. In a system with Solar chargers, make sure that the Absorption
voltage as configured in the MPPT is slightly above the same setting in the inverter/charger. The latter needs to recognize that
the battery voltage has reached the absorption level. If it doesn’t, the SOC will be stuck at the earlier mentioned End-of-bulk
percentage, default 85%.

5.3. Customize the logo on the Boat & Motorhome page

It is possible to use a custom logo onto the Boat & Motorhome page.

Type the following address into the web browser of a device connected to the same network. Using this address as a tem­plate: http://venus.local/logo.php or http://[ip-here]/logo.php (inserting your device’s IP address between the square brackets). The
IP address can be found by going to Settings -> Ethernet or Wifi. Once the page is loaded, Choose an image file from your de­vice. Re-boot the GX device.

36

Cerbo GX Manual

6. Updating GX Firmware

6.1. Via internet or with microSD-card/USB-stick

There are two ways to update the firmware:

1. Update it via the internet, either manually or let it check for new updates every day

2. Update it from a microSD-card or USB-stick

6.2. Direct download from the internet

Direct download from the internet

To update from the internet, navigate to: Settings→ Firmware→Online updates.

6.3. MicroSD-card or USB-stick

Updating with a microSD-card or USB-stick is called 'Offline updating'. Use it when updating a device that is not connected to the
internet.

Step 1. Download

Get the latest swu file:

• venus-swu-einstein.swu

Note that the same files, and the change log, is available on Victron Professional. That also features a dropbox connection, so
you can always have the latest file available on your laptop.

Step 2. Install on a microSD card or usb stick

Store the file in the root folder of a USB-stick or microSD-card.

Step 3. Insert the device

Note that you will see a warning “Not using media for storing logs”. That warning can safely be ignored.

37

Cerbo GX Manual

Step 4. Initiate the update

Navigate to Settings → Firmware → Offline updates.

Press Check for updates

If the firmware in the microSD-card or USB-stick is newer than the running one, “Update available” item will appear, press it to
start the update process.

6.4. Changelog

The change log is available in Victron Professional, under Firmware, Venus OS.

38

Cerbo GX Manual

7. VE.Bus Inverter/charger monitoring

7.1. Input current-limiter setting

'Overruled by remote' setting in VEConfigure

This chapter explains the implications of enabling or disabling user control of the input current-limiter setting, as seen here in the
menu:

The limit as set by the user in the Cerbo GX will be applied to all inputs where 'Overruled by remote', configured with VictronCon­nect or VEConfigure, is enabled:

Using the example of a boat with two AC inputs and a Quattro where:

1. A Genset capable of delivering 50A is connected to input 1;

2. Shore power is connected to input 2. (Available power depends on the rating of the harbour power-supply.)

Configure the system exactly as in above VEConfigure screenshot. Input 1 has priority over input 2, therefore the system will au­tomatically connect to the genset whenever it is running. The fixed input current limit of 50A will be applied. And when the genset
is not available, and mains is available on input 2, the Quattro will use the input current limit as configured in the Cerbo GX.

Two more examples: (In both cases if you disable 'Overrule by remote', setting a current limit in the Cerbo GX will have no effect.
And if you enable 'Overrule by remote' for both inputs, the current limit set in the Cerbo GX will be applied to both inputs.)

39

Cerbo GX Manual

Minimum input current limit values

When PowerAssist is enabled in VEConfigure, there is a minimum input current limit. The actual limit differs for each model.

After setting the input current to a value below the limit, it will automatically be increased again to the limit.

Note that is still possible to set the input current limit to 0. When set to 0, the system will be in passthrough (charger disabled).

Parallel and three phase systems

The configured AC input current limit is the total limit per phase.

7.2. Phase rotation warning

The AC supply, either Generator or Grid, to a three phase inverter/charger system needs to be in the correct rotation, also known
as sequence. If not, then the Inverter/chargers will not accept the AC supply and remain in Inverter mode.

The Phase rotation warning will be raised in such case. To resolve the issue, change the wiring on the AC input: swap either one
of the phases, effectively changing the rotation from L3 → L2 → L1 to L1 → L2 → L3. Or reprogram the Multis and modify the
phase assigned to match the wiring.

On the GX device itself, the warning will be popup as a notification on the GUI:

Also, it is visible in the menus:

And on the VRM Portal, it is visible on the VE.Bus Alarms & warnings widget on the Advanced page:

40

Cerbo GX Manual

And also it will be listed in the Alarm Log on VRM, and an email will be sent; using the VRM Alarm Monitoring system.

7.3. Grid failure monitoring

When this feature is enabled, an alarm is raised when the system hasn't been connected to the AC input configured to be Grid or
Shore for more than 5 seconds.

The alarm shows as a Notification in the GUI, and as an alarm on the VRM Portal, and is available on ModbusTCP / MQTT.

Recommend to use for backup systems. But also for yachts or vehicles on shore power.

Note that this settings monitors that the system is connected to grid/shore. Generator monitoring is already available as part of
the Generator start/stop function and not part of this.

Do not use this feature in systems that use the Ignore AC Input settings in our inverter/chargers: when the system ignores the AC
input, ie runs in island mode, as intended, even though grid is available, it will report a grid failure.

7.4. Advanced menu

Equalisation

Starts equalisation. See Multi or Quattro documentation for details.

Redetect system

41

Cerbo GX Manual

Redetects the type of inverter/charger and its features & configuration. Use this feature when, for example, a VE.Bus BMS
used to be part of a system, and is no longer.

System reset

Restarts the inverter/charger when it has stopped retrying. For example after a (very) heavy overload; or three overloads in a row.

ESS Relay test

Shows the status of the ESS Relay test. Only relevant when its an ESS system. See Q9 in the ESS Manual FAQ for details

42

Cerbo GX Manual

8. DVCC - Distributed Voltage and Current Control

8.1. Introduction and features

Enabling DVCC changes a GX device from a passive monitor into an active controller. The available features and effects of ena­bling DVCC depend on the type of battery used. The effect also depends on the installed Victron components and their configura­tion.

Example 1 - Managed CAN-bus batteries For example, in systems with an Managed CAN-bus BMS battery connected, the GX
receives a Charge Voltage Limit (CVL), Charge Current Limit (CCL), Discharge Current Limit (DCL) from that battery and relays
that to the connected inverter/chargers and solar chargers. These then disable their internal charge algorithms and simply do
what they're told by the battery. There is no need to set-up charge voltages or choose the charge algorithm type.

Example 2 - Lead batteries For systems with lead batteries, DVCC offers features such as a configurable system wide charge
current limit, where the GX device actively limits the inverter/charger in case the solar chargers are already charging at full power.
As well as shared temperature sense (STS) and shared current sense (SCS).

This table shows the recommend settings for different battery types:

Carefully study the following chapters to fully understand DVCC for a particular system.

To enable or disable DVCC, see Settings → DVCC in the menus:

43

Cerbo GX Manual

8.2. DVCC Requirements

Battery compatilibity

For CAN-bus connected batteries, check the relevant page on the Battery Compatibility manual to see if enabling DVCC has
been tested with your battery-type and is supported. If DVCC is not mentioned in notes relating to your battery, do not enable
DVCC.

For Gel, AGM, OPzS and other lead batteries, DVCC can be used without any problem. The same is true for Victron Energy lithi­um batteries with the VE.Bus BMS, the Lynx Ion + Shunt BMS or the Lynx Ion BMS. DVCC is the preferred operating mode for
Redflow ZBM2/ZCell batteries using the Redflow CANBus BMS.

Firmware versions

Do not use DVCC in cases where these requirements are not met. In all cases we recommend to install the latest available firm­ware during commissioning. Once running well, there is no need to pro-actively update firmware without reason. In case of diffi­culty, the first action is to update firmware.

Required minimum firmware versions:

• Multi/Quattro: 422

• MultiGrid: 424

• Cerbo GX: v2.12

• VE.Direct MPPTs: v1.46

• VE.Can MPPTs with VE.Direct: v1.04

• Older style VE.Can MPPT Solar Chargers (with the screen) cannot be used: they do not support the new control mechanisms.

• Lynx Ion + Shunt: v2.04

• Lynx BMS: v1.09

From Venus firmware v2.40, there will be a warning message 'Error #48 - DVCC with incompatible firmware' when one of the
devices has an incompatible firmware while using DVCC.

In case of an ESS System, the ESS Assistant needs to be version 164 or later (Released in November 2017).

8.3. DVCC effects on the charge algorithm

Our inverter/chargers and MPPT Solar Chargers use their own internal charge algorithm when in stand-alone mode. This means
that they determine how long to remain in Absorption, when to switch to Float, when to switch back to Bulk, or Storage. And in
those various phases they use the configured parameters in VictronConnect and VEConfigure.

In certain systems, the internal charge algorithm is disabled, and the charger is then working with an externally controlled charge
voltage target.

This guide explains the different possibilities:

Internal

The internal charge algorithm (bulk → absorption → float → re-bulk), and the configured charge voltages are active.

Inverter/charger indicated charge state: bulk, absorption, float, and-so-forth.

MPPT indicated charge state: bulk, absorption, float and-so-forth. (firmware version v1.42 onwards. Earlier versions have a bug
that make the MPPT say “Ext. Control” when it is only being current limited; its internal charge algorithm still active.

Inverter/charger (applies to MPPTs only)

44

Cerbo GX Manual

The MPPTs internal charge algorithm is disabled; instead it's being controlled by a charge voltage setpoint coming from the inver­ter/charger.

MPPT indicated charge state: Ext. control.

Battery

The internal charge algorithm is disabled; and instead, the device is being controlled by the battery.

Inverter/charger indicated charge state: Bulk when in current controlled mode, Absorption when in voltage controlled mode. Never
Float; even though currents might be low / battery might be full.

MPPT indicated charge state: Ext. control.

8.4. DVCC features for all systems

These features apply to all types of systems when DVCC is enabled: with or without ESS Assistant, and with lead or other normal
batteries as well as when an intelligent CAN-bus BMS connected battery is installed:

8.4.1. Limit charge current

This is a user-configurable maximum charge current setting. It works across the whole system. MPPT Solar Chargers are auto­matically prioritized over the mains/generator.

This setting is available in the “Settings → “System Setup” menu on the GX device.

Particulars:

1) If a CANBUS-BMS is connected and the BMS requests a maximum charge current that is different from the user-configurable

setting, the lower of the two will be used.

2) This mechanism only works for Victron inverter/chargers and Solar chargers. Other chargers, such as Skylla-i’s are not control-

led and also their charge current is not taken into account. The same applies for devices that are not connected to the GX device,
such as an alternator. Worded differently: the total charge current of the inverter/chargers and all MPPTs will be controlled, noth­ing else. Any other sources will be extra charge current, unaccounted for. Even when installing a BMV or other battery monitor.

3) DC Loads are not accounted for. Even when a BMV or other battery monitor is installed. For example, with a configured maxi-

mum charge current of 50 Amps, and DC Loads drawing 20 Amps, the battery will be charged with 30 Amps. Not with the full
allowed 50 Amps.

4) Current drawn from the system by the inverter/charger is compensated for. For example, if 10A is drawn to power AC loads,

and the limit is 50A, the system will allow the solar chargers to charge with a maximum of 60 Amps.

5) In all situations, the maximum charge limit configured in a device itself, ie. the Charge current limit set with VictronConnect or

VEConfigure for the Solar chargers or Inverter/chargers will still be in effect. An example to illustrate this: in case there is only an
Inverter/charger in the system, and in VEConfigure or VictronConnect the charge current is configured to 50 Amps. And on the
GX Device, a limit of 100A is configured, then the working limit will be 50 Amps.

8.4.2. Shared Voltage Sense (SVS)

Works with VE.Bus devices and VE.Direct Solar Chargers.

The system automatically selects the best available voltage measurement. It will use the voltage from the BMS or a BMV battery
monitor, if possible, otherwise it will use the battery voltage reported by the VE.Bus system.

The voltage displayed on the GUI reflects the same voltage measurement.

Shared Voltage Sense (SVS) is by default enabled when DVCC is enabled. It can be disabled with a switch in the Settings →
System Setup menu.

45

Cerbo GX Manual

8.4.3. Shared Temperature Sense (STS)

Select the temperature sensor to use; and the GX device will send the measured battery temperature to the Inverter/charger sys­tem as well as all connected Solar Chargers.

Selectable sources for the battery temperature are:

• BMV-702 battery monitor

• BMV-712 battery monitor

• Lynx Shunt VE.Can battery monitors

• Temperature inputs on a Cerbo GX (and same for other GX devices that have a temperature input)

• Multi/Quattro inverter/charger

• Solar Chargers (if fitted with a temperature sensor)

8.4.4. Shared Current Sense (SCS)

This feature forwards the battery current, as measured by a battery monitor connected to the GX device, to all connected solar
chargers.

The solar chargers can be configured to use the battery current for its tail current mechanism that ends absorption when the cur­rent is below the configured threshold. For more information about that, refer to Solar charger documentation.

This feature only applies to systems that are not ESS, and/or don’t have a managed battery, since in both of those cases the
MPPT is already externally controlled.

Requires MPPT solar charger firmware v1.47 or newer.

8.5. DVCC Features when using CAN-bus BMS Battery

This chapter applies to all systems where an intelligent battery BMS is installed, and connected via CAN-bus. Note that this does
not include the Victron VE.Bus BMS.

Such intelligent BMS sends four parameters to the GX device:

1. Charge voltage limit (CVL): the maximum charge voltage that the battery currently accepts.

2. Charge current limit (CCL): the maximum charge current requested by the battery.

3. Discharge current limit (DCL): the maximum discharge current as requested by the battery.

For all three parameters, some types of batteries transmit dynamic values. For example they determine the maximum charge volt­age based on cell voltages, state of charge, or for example temperature. Other makes and brands use a fixed value.

Here is the page in the menus showing the parameters:

For such batteries, there is no need to wire allow-to-charge and allow-to-discharge connections to the AUX inputs on a Multi or a
Quattro.

When inverting, ie in Island mode, Multis and Quattros will shut down when the max discharge current is zero. They will automati­cally start again as soon as either AC mains returns, or when the BMS increases the max discharge current again.

See previous chapter, “Limit charge current”, the user setting, for details about how the Maximum charge current is used, how it
prioritises solar and more.

All above means that setting up charge voltages or charge profiles in VEConfigure or VictronConnect is not necessary, and will
also have no effect. The Multis, Quattros and MPPT Solar Chargers will charge with the voltage as received via CAN-bus from the
battery.

46

Cerbo GX Manual

8.6. DVCC for systems with the ESS Assistant

• The ESS Keep batteries charged mode works properly. It does not without DVCC.

• A fixed solar offset of 0.4V is used instead of a variable 2V. (values for 48V systems, divide by 4 for 12V). Note that this solar
offset is only applied when ESS-mode is set to Optimized in combination with the Feed-in excess solar charger power-setting
enabled, or when ESS-mode is set to Keep batteries charged.

• Add Auto-recharge feature for the ESS Modes Optimized and Optimized (with BatteryLife). The system will automatically re­charge the battery (from the grid) when the SOC drops 5% or more below the value of ‘Minimum SOC’ in the ESS menu. Re­charge stops when it reaches the Minimum SOC.

• ESS improved state display: In addition to the charger states (Bulk/Absorption/Float), additional Discharging and Sus­tain modes were added. In addition it also shows reasons for the state it is in:

• #1: Low SOC: discharge disabled

• #2: BatteryLife is active

• #3: Charging disabled by BMS

• #4: Discharging disabled by BMS

• #5: Slow Charge in progress (part of BatteryLife, see above)

• #6: User configured a charge limit of zero.

• #7: User configured a discharge limit of zero.

47

Cerbo GX Manual

9. VRM Portal

9.1. VRM Portal Introduction

When connected to the internet, a GX device can be used in combination with the Victron Remote Management (VRM) portal,
which enables:

• Easy remote access to all statistics and systems status online

• Remote Console on VRM: access and configure your system as if you were standing besides it

• Remote Firmware updates of connected Solar Chargers and other Victron products.

• Use of the VRM App for iOS and Android.

See Internet Connectivity chapter [17] for how to connect the device to the internet.

9.2. Registering on VRM

Instructions are in the VRM Portal Getting Started document.

Note that any system will need to first have been able to successfully send data to the VRM Portal. As long is there has been no
successful connection, it will not be possible to register the system to your VRM user account. In such case, refer to below Trou­bleshooting section 5.7.

9.3. Datalogging to VRM

Data-logs are transmitted to the VRM Portal over the Internet, if it's available. All related settings are available in the VRM Online
Portal menu:

The transmission of the data logs has been designed to work also on bad internet connections. Lines of up to 70% permenant
packet loss are still sufficient to get the data out, even if delayed in some cases.

Adding an external storage device

When unable to transmit the logs, then the GX device will store them to non-volatile storage (ie. data is not lost on a power loss or
reboot).

The GX device has a buffer to store a couple of days worth of logs internally. To extend this period, insert a microSD card or USB
stick. You can see the internal storage status in the settings.

Note that, when inserting such storage device, any internally stored logs will automatically be transferred to the inserted stick: no
data is lost.

With or without an external storage device inserted, the GX Device will always keep trying to connect to the portal and transmit all
backlogged logs. That means that even with months worth of backlog, once it re-acquires an Internet connection, all of the back­log is sent out. The data is sent in a compressed manner: sending a lot of backlogged data will use considerably less bandwidth
than than sending the data with a continuously available internet connection.

Storage device requirements

• MicroSD cards or USB flash drives must be formatted as FAT12, FAT16 or FAT32 file systems - and not exFAT or NTFS.

• SD and SDHC type microSD cards of 32 GB capacity and smaller are sold containing FAT12, FAT16 or FAT32. They can be
used without a problem, unless they are subsequently re-formatted to a different file system.

• SDXC type microSD cards which have greater than 32 GB capacity are often formatted with exFAT, and therefore cannot be
used with the Cerbo GX without reformatting and possibly re-partitioning.

Manually transferring datalogs to VRM

48

Cerbo GX Manual

For devices permanently without Internet, it is possible to take the data out, and then upload it manually from a laptop.

1. go to Settings → VRM Portal, and click Eject the storage. Make sure to never just remove the SD-card/USB-stick, this can

lead to corruption and data loss.

2. now, remove the storage device and insert it into a computer or laptop that is connected to the internet.

3. open a webbrowser, and navigate to the VRM Portal.

4. Login, and then click the 'Upload GX file' option, and follow instructions:

5. Remove the file from the storage device, and then it re-insert it into the GX Device. Note that uploading the same data twice

does not cause any problems; but still it is better not to do that.

With a log interval of once per minute, the required storage space roughly amounts to about 25 MB per month, depending on the
number of connected products. So with a 1 GB microSD card, you can store about 3 years of backlog. In other words, any mi­croSD card or USB stick should be sufficient to store the 6 months of data which VRM retains.

When the storage device is full, no more data will be logged.

If multiple storage devices are inserted, the GX device will store the data on the one inserted first. When that is removed, it
will not use the other one. Instead, it will create an internal backlog buffer. Only inserting a new one will make it switch to using
external storage again.

Network watchdog: auto-reboot

This feature, disabled by default, makes the GX device automatically reboot itself in case it has not been able to connect to the
VRM Portal.

Please be careful with enabling this feature on ESS systems: when grid connection is lost, and the GX device reboots, the system
can lose power when rebooting takes too long (when grid is present, the Multi's or Quattro's will enter passthru).

9.4. Trouble shooting data logging

This chapter explains what to do when the GX Device cannot transmit data to the VRM Portal.

The communication required to send logs to the VRM Portal is:

1. Working DNS

2. Proper IP address

3. Working internet connection

4. Outbound http(s) connection to http://ccgxlogging.victronenergy.com on port 80 and 443. Note that should never be an issue,

unless on very specialized company networks.

Note that the Cerbo GX does not support a proxy setup. For more details on the required networking, see here.

Step 1: Update the GX Device to the latest available firmware

GX Device firmware update instructions

Step 2: Verify the network and internet connection

In the menu Settings → Ethernet or Settings → Wi-Fi, check the following:

1. State must be ‘Connected’

49

Cerbo GX Manual

2. There must be an IP address, that does not start with 169.

3. There must be a gateway

4. There must be DNS servers

For a GX GSM, see the Troubleshooting guide in the GX GSM Menu.

In case the IP address starts with 169, check whether your network has a DHCP server running. 99% of all networks have a
DHCP server running and it is enabled by default on all well-known ADSL, cable and 3G routers. If there is no DHCP server run­ning, then configure the ip address manually.

Ethernet

When using Ethernet and State shows 'Unplugged', verify that the Ethernet network cable is not faulty: try another one. The two
lights at the back of the Cerbo GX, where the Ethernet RJ45 cable plugs in, should be lit or blinking. Two dead lights indicate a
connection problem.

WiFi

When using Wi-Fi and the menu shows 'No Wi-Fi adapter connected' check the USB connection to the Wi-Fi dongle. Try to re­move the dongle and insert it again.

When using Wi-Fi and the State shows 'Failure', it might be that the Wi-Fi password is incorrect. Press 'Forget network' and try to
connect again with the correct password.

Step 3. Verify VRM Portal Connectivity

Navigate to Settings → VRM online portal, and check the Connection error status:

50

Cerbo GX Manual

If a Connection error is shown, the Cerbo GX is not able to contact the VRM database. The connection error will show an error
code that indicates the nature of the connectivity problem. Also, details of the error message are shown, to facilitate on site IT
experts to diagnose the problem.

• Error #150 Unexpected response text: The http/https call succeeded, but the response was incorrect. This indicates that there
is a WiFi or network login page. Such as seen in Airports, Hotels, Marinas or RV campgrounds some times. There is no solution
to make the CCGX work with a WiFi network that requires such login page and/or accepting of terms of use.

• Error #151 Unexpected HTTP Response: A connection succeeded, but the response did not indicate a successful HTTP result
code (normally 200). This might indicate that a transparent proxy is hijacking the connection. See #150 above for examples.

• Error #152 Connection time-out: this could indicate a poor quality internet connection, or a restrictive firewall.

• Error #153 Connection error: this could indicate a routing problem. For details, check the shown error message:

• Error #153 Connection problem, and then specifically an SSL related issue, such as in below screenshot: check the date and
time setting of the Gx Device, and also the time zone. And check that your router router is not showing a special disclaimer,
login or acceptance page, like often seen in airports, hotels and other public wifi.

• Error #154 DNS Failure: Make sure that a valid DNS server is configured in the Ethernet or WiFi menu. Typically this is as­signed automatically by a DHCP server in a network.

• Error #155 Routing error: VRM is unreachable. This error occurs if an ICMP error is received indicating that no route exists to
the VRM server. Make sure your DHCP server assigns a working default route, or that the gateway is correctly configured for
static configurations.

• Error #159 Unknown error: this is a catch-all error for errors that cannot be directly categorised. In such cases the Error mes­sage will provide information about the problem.

51

Cerbo GX Manual

Check 'Last contact'. If this shows dashes, the GX device has not been able to contact the VRM Portal since power up. If it shows
a time, but still an error is shown, then the GX device has been able to send data, but has since lost contact.

The 'Buffered items' indicates the number of logs that it has stored to send later. If this is larger than 0, it means that the Cerbo
GX can not connect to the VRM Portal. All data is sent using the First in First out principle: the VRM Portal will only show the most
up to date information after all old data has been sent.

9.5. Analysing data offline, without VRM

In certain cases, for example for very remote sites where there is no internet available, it can be useful to be able to analyse the
data without first having to upload it to the VRM Portal.

1. Install VictronConnect on a Windows or Apple laptop

2. Insert the storage device containing the log file(s)In Victron

3. Connect, use the GX Log Converter feature to convert them to Excel sheets.

9.6. Remote Console on VRM - Trouble shooting

Follow these steps to trouble shoot Remote Console on VRM

1. Make sure that Logging to the VRM portal works, see chapter 5.4. Without this; Remote Console on VRM will not work.

2. After enabling the Remote Console feature, make sure to set (or disable) the password.

3. Also make sure to restart the Cerbo GX after setting (or disabling) the password.

4. Make sure to update the Cerbo GX to the latest firmware version. The last stability improvement for Remote Console was

made in version v2.30.

5. After the restart, check the Remote Console on VRM status shows online or a port number. In case it says offline, or port

number 0, the Cerbo GX was unable to connect to the Remote Console server. This is normally caused by a (company) fire­wall, blocking the connection. The solution is then to configure an exception rule in the firewall.

6. -Verify that your web browser, on which you're using VRM, can access both of below URLs. Click both of the links, to check

them. Note that seeing an Error means that all is OK. The good error is 'Error response, Error code 405, Method Not Allowed'.
If you get a timeout or another (browser) error, there may be a firewall blocking the connection. https://vncrelay.victronener­gy.com & https://vncrelay2.victronenergy.com/

Technical background

To have Remote Console on VRM working, your web browser and the GX Device need to have a connection between them. This
connection is designed such that it doesn't need any special configuration or opening up of firewalls in almost all situations. The

0.1% of situations where it doesn't work out of the box are, for example, large corporate networks with special security, or long

range expensive satellite or radio supported networks, such as seen in rural areas of Africa and other remote areas.

When Remote Console on VRM is enabled, the GX Device will open and maintain a connection to any of the servers pointed to
by supporthosts.victronenergy.com. Which currently resolves to two IP addresses (84.22.107.120 and 84.22.108.49), and likely
more in the future. The technology used is SSH, and it will try to connect using port 22, 80 and 443, only one of them needs to
work. The reason for it to try all three is that on most networks at least one of them will be allowed by the local firewall.

Once connected to one the the supporthost servers, that reverse SSH tunnel is waiting to be connected from someone needing
the connection. Which can be your browser, or a Victron engineer since this same technology is used for the Remote Support
functionality; for more information see above.

52

Cerbo GX Manual

When using Remote Console on VRM, the browser will connect to either vncrelay.victronenergy.com, or vncrelay2.victronener­gy.com, using websockets on port 443. For more details of used connections by the GX Device, see Q15 of the FAQ.

53

Cerbo GX Manual

10. Marine MFD integration by App

10.1. Introduction & requirements

A Glass Bridge is a MFD (Multi-Functional Display) that integrates a boat’s systems and navigation status into a large screen or
screens at the helm of the vessel, so doing away with multiple gauges, brackets and wiring complications.

A Victron system can be easily integrated into that, as shown in this video:

https://www.youtube.com/watch?v=RWdEQfYZKEs

Functionalities:

• Monitor shore power and generator status.

• Monitor battery status for one or more batteries. By using the voltage of for example battery chargers, it can also visualise sec­ondary batteries such as Generator starter batteries.

• Monitor the power conversion equipment: chargers, inverters, inverter/chargers.

• Monitor solar production from an MPPT Solar Charger.

• Monitor AC loads, and DC loads.

• Control shore power input current limit.

• Control the inverter/charger: switch it off, on, or set it to charger-only.

• Optionally open the Victron Remote Console panel; allowing access to further parameters.

Victron equipment compatibility:

• All Victron inverter/chargers: From a 500VA single phase device up to a large 180kVA three phase-system, including Multis,
Quattros, 230VAC and 120VAC models.

• Battery Monitors: BMV-700, BMV-702, BMV-712, SmartShunt, and newer, Lynx Shunt VE.Can, Lynx Ion BMS.

• All Victron MPPT Solar Charge Controllers

Required components:

54

Cerbo GX Manual

• Battery system.

• Victron GX Device (all models are compatible: CCGX, Cerbo GX, Venus GX, and so forth)

• Victron Inverter/charger.

• Victron Battery monitor.

• Ethernet network cable connected between MFD and the GX device

• MFD specific ethernet adapter cable (only for some brands, see detailed information in below links)

10.2. Compatible MFDs and instructions

Instructions for Garmin MFDs

Instructions for Navico MFDs (Simrad, B&D, Lowrance)

Instructions for Raymarine

Instructions for Furuno

Using the App for other purposes

The App as visible on the MFDs, is a HTML5 App, hosted on the GX Device. It can also be accessed from a normal PC (or a
tablet), by navigating to with a browser to: http://venus.local/app/. Or replace venus.local with the GX IP address.

55

Cerbo GX Manual

11. Marine MFD integration by NMEA2000

11.1. NMEA2000 Introduction

Our GX Devices feature an NMEA 2000-out function: when enabled, the GX Device acts as a bridge: it makes all Battery moni­tors, Inverter/chargers and other products connected to the GX device available on the NMEA2000 network.

Using that feature, and having the GX Device connected a NMEA2000 network, Marine MFDs can read this data and visualise it
to the user. Often in a highly configurable manner.

Use our VE.Can to NMEA2000 micro-C male cable to connect the GX Device to the NMEA 2000 network.

Comparison to the App integration

Compared to MFD integration using the App, as explained in the previous chapter, integration via N2K offers a more customisable
configuration. The downside of integration via N2K is that there is more work in making such configuration, as well as making
sure all PGNs and fields therein are supported and compatible between the Victron system and the MFD.

More information

Besides this chapter, make sure to also read the introduction blogpost, as well as our main Marine MFD Integration document.

Besides this chapter, make sure to also read (1) the introduction blogpost, (2) our main Marine MFD Integration document and (3)
the NMEA2000 chapter in the Victron manual for the MFD you are using (Navico/Simrad/Lowrance/B&G, or Raymarine, or Gar-

min, or Furuno)

Yes that is a lot of reading, but that is basically inherent to NMEA2000: for example some of those MFDs support displaying AC
data received over the NMEA2000 wiring, others do not. Some require changing Data instances, others do not, and so forth.

11.2. Supported Devices / PGNs

NMEA 2000 defines several messages. Messages are identified by their parameter group number (PGN). A textual description of
the message is publicly available on the NMEA 2000 website (http://www.nmea.org/).

Detailed specification of the protocol and message definition or part thereof can be ordered online on the NMEA 2000 website.

NMEA 2000 is based on and compatible with SAE J1939. All AC information messages are in the AC status message format as
defined in J1939-75. The specification of these messages can be bought on the SAE website (http://www.sae.org/).

For a detailed list of PGNs, please refer to our data communication whitepaper.

Inverter/chargers

All inverter/chargers that connect using a VE.Bus port are supported. This includes Multis, Quattros, MultiPlus-IIs, and other (simi­lar) Victron inverter/chargers.

Data is transmitted out; and its possible to set shore current as well as switch the inverter charger on, off, inverter only and charg­er only.

The interface has two functions:

• The function, “153 Inverter”, represents the AC-output

• The function “154 AC Input” monitor represents the AC-input

Charger Status messages will be sent by the Inverter function. Both functions have their own network address.

Since both functions transmit the same PGNs, for example an AC Status PGN containing voltage, current and more information,
NMEA 2000 data consumers like generic displays will need to be able to make a distinction based on the network address.

Depending on the function belonging to that network address the need to interpret it as either Inverter Input or Inverter Output.

56

Cerbo GX Manual

Displays not being capable of doing so will regard the data as belonging to the mains (utility).

The Inverter Output is then interpreted as utility #0 and Inverter Input as utility #1. These default instance numbers can be
changed by a network configuration tool if necessary.

Inverters

Only VE.Bus type inverters are supported: any Inverter connected using VE.Direct is not (yet) made available on the N2K bus.

Battery monitors

Supported. This includes any battery monitor as supported by the GX Device.

Solar chargers

Not yet supported by the NMEA2000-out function but in the works and expected after in a firmware update after the summer of

2020.

Tank level data

Not yet supported by the NMEA2000-out function but in the works and expected after in a firmware update after the summer of

2020.

Other data and product types

Not supported. Above explicitly mentioned types are the only ones now supported. For example data from a charger (such as the
Phoenix Smart Charger connected via VE.Direct) is not supported and not expected to be supported soon.

11.3. NMEA2000 Related menu settings

Table 1.

Setting Default Description

CAN-bus Profile VE.Can Defines the type & baudrate of the CAN-bus network. To use in combination with NMEA2000, make sure to choose one of the

Send data to
VE.Can

Unique device
number

Off Enables and disabled the NMEA2000-out function

1 Selects the block of numbers to use for the NAME Unique Identity Numbers in the PGN 60928 NAME field. For the GX Device

profiles that include VE.Can and is at 250kbit/s

itself, and when NMEA2000-out is enabled, also for the virtual-devices. Change it only when installing multiple GX Devices in the
same VE.Can network. There are no other reasons to change this number.

57

Cerbo GX Manual

Setting Default Description

Check unique
numbers

Searches for other devices that use the same unique number. When the search is completed it will respond with either an OK, or
the text :

There is another device connected with this unique number, please select another one.

Note that there is normally no reason to use this function: the GX Device automatically and continuously checks uniqueness of the
numbers in use, and will warn when in case there is a conflict. This setting is made available to quickly confirm that everything is
OK after changing the setting.

11.4. NMEA2000-out technical details

11.4.1. NMEA2000 Glossary

Here is a glossary to help with the interpretation of this text:

• Virtual-device: a Battery Monitor, Inverter, or other Victron device that does not have a CAN-bus port by itself, made available
“virtually” on the CAN-bus by the NMEA2000-out function of the GX Device.

• CAN-bus: the VE.Can port on the GX Device, that, in the context of this chapter, is most likely connected to a NMEA2000 net­work.

• NMEA2000-out function: the software feature in the GX Device, which is described in this chapter.

• NMEA2000: Marine CAN-bus protocol, based on J1939.

• Instance: there are many types of instances, and explained in detail below.

• J1939: A set of standards defining a CAN-bus protocol, defined by the SAE organisation.

• Address Claim procedure (ACL): a mechanism, specified by J1939 and used in NMEA2000, which used by devices on the net­work to negotiate and assign each device on the network a unique network addresses. Its is a number from 0 to 252. There are
three special network addresses defined:

1. 0xFD (253) - Reserved

2. 0xFE (254) - Unable to claim address - for example when all others are in use

3. 0xFF (255) - The broadcast address

11.4.2. NMEA2000 Virtual-devices35 (Electrical generation)

When the NMEA2000-out feature is enabled, the GX Device acts as a bridge: it will make each Battery monitor, Inverter/charger
or other device that is connected, available individually on the CAN-bus.

Individually, as in each with its own network address, its own device instance, function codes, and so forth.

For example, a GX Device with two BMVs connected on a VE.Direct port and an inverter/charger connected using VE.Bus, will
make the following data available on the CAN-bus:

Table 2.

Address Class Function Description

0xE1 130 (Display) 120 (Display) The GX Device itself

0x03 35 (Electrical generation) 170 (Battery) The 1st BMV

0xE4 35 (Electrical generation) 170 (Battery) The 2nd BMV

0xD3 35 (Electrical generation) 153 The inverter/charger (AC-output)

0xD6 35 (Electrical generation) 154 The inverter/charger (AC-input)

11.4.3. NMEA2000 Classes and functions

As per NMEA2000 specification, these define the types of senders and devices connected to the CAN-bus. Classes are the main
categories, and functions specify it to a further detail.

11.4.4. NMEA2000 Instances

NMEA2000 defines three different instances:

1. Data instance

2. Device instance

3. System instance

For all Battery monitors and other devices that the GX Device makes available on the CAN-bus, each of the above types of in­stance is available, and can be individually configured.

Per virtual-device, there is one Device instance and one System instance. And depending on the type of the virtual-device, there
are one or multiple Data instances.

For example, for a BMV-712 there are two data instances, one “DC Instance” for the main battery, and another one for the Starter
battery voltage.

58

Cerbo GX Manual

How to configure the instances depends on the equipment and software that is used to read them from the CAN-bus. Examples
of equipment and software meant here are MFDs such as from Garmin, Raymarine or Navico; as well as more software oriented
solutions from for example Actisense and Maretron.

Most, or hopefully all, of those solutions identify parameters and products by requiring unique Device instances, or using the PGN
60928 NAME Unique Identity Numbers. They do not rely on the data instances to be globally unique.

The NMEA2000 specification specifies the following: “Data instances shall be unique in the same PGNs transmitted by a device.
Data instances shall not be globally unique on the network. Field programmability shall be implemented through the use of PGN
126208, Write Fields Group Function.”.

In other words, data instances need to be unique only within a single device. There is no requirement for them to be globally
unique – the only exception is “Engine Instance” that at least for now, to cope with legacy devices, needs to be globally unique
(e.g. Port = 0, Starboard = 1). For example, some of our BMV Battery monitors can measure two voltages, one for the main
battery, and one for the starter battery, and thats where data instancing is used. Similar for multiple-output battery chargers. Note
that there is no need for the installer to change those data instances, as those products are pre-configured to transmit the rele­vant PGNs with unique data instances (Battery instance & DC Detailed instance, in this case).

WARNING: whilst it is possible to change the data instances, changing them on a Victron devices will render that device impossi­ble to read correctly by other Victron devices.

A note about the Device instances: it is not necessary to assign a unique device instance to each device on the CAN-bus. Its no
problem for a battery monitor and a solar charger to both be configured with (their default) Device instance 0. Also when having
multiple battery monitors or solar chargers, it is not always necessary to assign each of them a unique device instance. If at all
necessary, they only need to be unique between the devices that use the same Function.

And note that changing the Device instance on a Victron device can change its operation, see below.

System instances

As per NMEA2000 specification, this instance is a 4-bit field with a valid range from 0 to 15 that indicates the occurrence of devi­ces in additional network segments, redundant or parallel networks, or sub networks.

The System Instance Field can be utilized to facilitate multiple NMEA 2000 networks on these larger marine platforms. NMEA
2000 Devices behind a bridge, router, gateway, or as part of some network segment could all indicate this by use and application
of the System Instance Field.

The ECU instance and Function instance

In some documentation and software tools, yet other terminology is used:

• ECU Instance

• Function Instance

• Device Instance Lower

• Device Instance Upper

Here is how they all relate: the ECU Instance and Function Instance terminology originates from the SAE J1939 and ISO 11783-5
specification. And they do not exist in the NMEA2000 definition. However, they all do define the same fields in the same CAN-bus
messages which NMEA2000 defines as Device instance.

In more detail: the field that J1939 defines as ECU Instance is in the NMEA2000 specification renamed to Device Instance lower.
The Function Instance is renamed to Device Instance Upper. And together they form the Device Instance, an NMEA2000 defini­tion.

While using different terms, those fields are the same fields in both standards. Device Instance Lower being 3 bits in length, and
Device Instance Upper 5, together 8 bits. Which is the one byte being the NMEA2000 Device Instance.

The Unique Instance

The Unique Instance is one more word used to describe almost the same information. It's used by Maretron, and can be made
visible in their software by enabling the column. The Maretron software itself chooses between Device Instance and Data In­stance.

11.4.5. NMEA2000 Changing Instances

Data instance

Even though we recommend to not change data instances (see explanation and WARNING above), it is possible to change them.

There is no option within Venus OS to change them - a third party tool is required and the only tool that we know can do that is
Actisense NMEA2000 reader.

To change the Data instances, see this document.

Device instance

59

Cerbo GX Manual

To change the Device instances, see this document.

WARNING: these (Victron-)features depend on the Device Instance:

1. For an ESS system with Solar chargers connected on a VE.Can network, those Solar chargers must remain to be configured

to their default Device instance (0) for proper operation. This does not apply to VE.Direct-connected Solar Chargers made
available on the CAN-Bus as a Virtual-device, using the NMEA2000-out function. Unless the Device instance of the GX De­vice is re-configured to another Device Instance. Which is technically possible but not advised and also never required. But in
that situation the chargers must be configured to the same instance as the GX Device.

2. For systems with managed batteries, the same.

3. For both Solar chargers, as well as AC-Connected battery chargers, when connected in a VE.Can network, they will syn-

chronise their operation. Charge state and such. For that function to work, all chargers must be configured to the same device
instance.

In summary, for the majority of systems we recommend to leave the Device instance to its default, 0.

11.4.6. PGN 60928 NAME Unique Identity Numbers

The GX device will assign an individual Unique Identity Number to each virtual-device. The number assigned is a function of
the PGN 60928 NAME Unique Identity Number block aka Unique device number for VE.Can as in above screenshot, as config­ured in the settings of the GX Device.

This table shows how changing that setting translates into the virtual-devices as made available on the CAN-bus:

Table 3.

configured Unique Identity block: 1 2 3 4

GX device 500 1000 1500 2000

1st virtual-device (for example a BMV) 501 1001 1501 2001

2nd virtual-device (for example another BMV) 502 1002 1502 2002

3rd virtual-device (for example a third BMV) 503 1003 1503 2003

60

Cerbo GX Manual

12. Digital Inputs

The Cerbo GX digital inputs are shown in the overview of connections. [5]

12.1. Configuration

Each of the digital inputs can be configured as one of a number of predefined sensors that can also be configured as alarms.

Note Pulse Meter is not supported in Cerbo GX.

The possible configurable functions are:

Function States

Door alarm Open/Closed

Bilge pump On/Off

Bilge alarm Ok/Alarm

Burglar alarm Ok/Alarm

Smoke alarm Ok/Alarm

Fire alarm Ok/Alarm

CO2 alarm Ok/Alarm

Generator Running/Stopped

The function of each input can be configured in the GUI under Settings → I/O → Digital Inputs.

Once the input is configured for its intended purpose, it will show up with other devices.

61

Cerbo GX Manual

Other parameters related to that function can be configured by entering the device menu and selecting Setup.

For sensors and alarms, you can decide whether the input should be treated as an alarm condition, whether the labels should be
inverted, and whether the logical levels should be inverted.

• To swap the labels attached to the alarm, set Inverted to on.

• If a logical low input (0V) should be considered a positive condition, set Inverted alarm logic to on.

12.2. Read-out of digital inputs via Modbus-TCP

The values/states of the digital inputs are available on Modbus-TCP. For more details about this, please download a copy of the
document “Modbus-TCP register list” from our website. And see our Modbus-TCP FAQ.

62

Cerbo GX Manual

13. Error Codes

Different origins of errors

On your GX device, some error codes shown will be from the GX device itself, in that case see below list. As the system control
panel, it also shows error codes from the connected devices.

• Multi and Quattro inverter/chargers: VE.Bus Error Codes

• MPPT Solar Chargers: MPPT Solar Charger Error Codes

GX Error #42 - Storage corrupt

This error means that the flash memory inside the GX Device is corrupt.

The device must be sent in for repair/replacement. It is not possible to correct this issue in the field or with a firmware update.

The affected flash memory is the partition that holds all user settings and factory data, such as serial numbers and wifi codes.

GX Error #47 - Data partition issue

The internal storage in the GX Device is most likely broken: causing it to loose its configuration.

Contact your dealer or installer; see www.victronenergy.com/support

GX Error #48 - DVCC with incompatible firmware

This error is raised when the DVCC feature is enabled whilst not all devices in the system are updated to recent enough firmware.
More information about DVCC and minimal required firmware versions in chapter 4 of this manual.

Note for systems with BYD, MG Energy Systems, and Victron Lynx Ion BMS batteries:

Since Venus OS v2.40, released in December 2019, the DVCC feature is automatically switched on when the system detects a
supported battery/BMS type connected. In systems that require DVCC to be enabled by the battery manufacturers, it is now no
longer possible to switch DVCC off.

This creates an issue for systems installed and commissioned a long time ago, before DVCC was available, and they may not
have the other necessary components or firmware to work correctly with it enabled.

The solution is to:

1. Disable automatic updates; Settings → Firmware → Online updates.

2. Roll back to v2.33; See Settings, Firmware and then Stored backup firmware.

3. Make sure that DVCC is disabled again.

Please do consult your installer, to check if the battery system is managed with two wire control (an earlier alternative control
method to DVCC) or not:

If there is no charge- and discharge- wiring between BMS, inverter/chargers and charge controllers, then DVCC is required for
above mentioned battery brands, and this also has certain minimum firmware requirements for connected Inverter/chargers and
Solar charge controllers.

Whats new since Venus OS v2.40 is (a) that it automatically enables DVCC when it sees the above mentioned battery types, and
(b) that when DVCC is enabled, it checks the connected devices for the minimum firmware, and raises Error #48 in case the firm­ware of one or more connected devices is too old.

63

Cerbo GX Manual

14. FAQ

14.1. Cerbo GX FAQ

Q1: I cannot switch my Multi/Quattro system on or off

To solve the problem, first find out how the system is connected, and then follow the right step by step instruction below. There
are two ways to connect a Multi/Quattro system to a Cerbo GX. In most systems they will be connected directly to the VE.Bus
port on the back of the Cerbo GX. And, option two, in some systems they are connected to the Cerbo GX using a VE.Bus to

VE.Can interface.

Step by step instructions when connected to VE.Bus port on the Cerbo GX

1. Update the Color Control to the latest available version. See our blog posts in the https://www.victronenergy.com/blog/catego-

ry/firmware-software/.

2. Do you have a Digital Multi Control or VE.Bus BMS in the system? In that case it is normal that on/off is disabled. See also

the VE.Bus related notes in the Cerbo GX manual

3. In case you have had a Digital Multi Control or VE.Bus BMS connected to your system, the Color Control remembers it and

even when those accessories have been removed the On/off switch will still be disabled. To clear the memory, execute a Re­detect system, the option is in the Multi or Quattro section of the Cerbo GX menu.

4. For parallel/three phase systems consisting of more than 5 units: depending on temperature and other circumstances, it might

not be possible to switch a system back on after switching it off with the Cerbo GX. As a work around you'll need to unplug the
VE.Bus cable from the back of the Cerbo GX. And plug it back in after starting the VE.Bus system. The real resolution is to
install the “Cerbo GX dongle for large VE.Bus systems”, partnumber BPP900300100. For details, read its connection instruc-

tion.

Step by step instructions when connected to Cerbo GX via VE.Can.

1. Update the Color Control to the latest available version. See our blog posts in the firmware category.

2. Update the VE.Bus to VE.Can interface to the latest version. The easiest way to do that is by using Remote firmware update:

having a special piece of hardware, the CANUSB, is then not necessary.

3. Do you have a Digital Multi Control or VE.Bus BMS in the system? In that case it is normal that on/off is disabled. See also

the VE.Bus related notes in the Cerbo GX manual

4. In case you have had a Digital Multi Control or VE.Bus BMS connected to your system, and it is now no longer connected, the

Canbus interface remembers it. Therefore, even after those accessories have been removed, the On/off switch will still be
disabled. Clearing this memory is unfortunately not possible yourself, please contact us so we can help you.

14.2. Q2: Do I need a BMV to see proper battery state of charge?

Moved here.

14.3. Q3: I have no internet, where can I insert a sim-card?

There is no 3G modem in the GX Device, and therefore also no slot for a sim-card. Go to a local store and buy a 3G router with
Ethernet ports. More information in the blog post link below and particularly in the comments section, as more users try differing
equipment:

https://www.victronenergy.com/blog/2014/03/09/off-grid-color-control-gx-to-vrm-portal-connectivity/

Note that it is not possible to use a VGR2 or VER for this. Also it will not be possible in the foreseeable future.

14.4. Q4: Can I connect both a GX Device and a VGR2/VER to a Multi/Inverter/

Quattro?

No. Also, instead of this combination, we recommend to use the Cerbo GX, and add a 3G or similar mobile router. See Internet

connectivity [17].

14.5. Q5: Can I connect multiple Color Controls to a Multi/Inverter/Quattro?

No.

14.6. Q6: I see incorrect current (amps) or power readings on my Cerbo GX

Examples are:

• I know that a load is drawing 40W from the Multi, but the Cerbo GX shows 10W or even 0W.

• I see that the Multi is supplying a load with 2000W, while in inverter mode, but from the battery only 1850W is being taken. Is
those 150W coming out of nowhere?

The general answer is: the Multi and Quattros are not measurement instruments, they are inverter/chargers, and the measure­ments shown are a best effort delivery.

64

Cerbo GX Manual

In more detail, there are several causes for measurement inaccuracies:

1. Part of the power taken from a battery by the inverter is being lost in the inverter, converted into heat: efficiency losses.

2. The Multi does not really measure the power being drawn from the battery. It measures the current at the output of the inver-

ter, and then makes an assumption of the power being drawn from the battery.

3. Watts vs VA: depending on the Multi/Quattro firmware version and also the Cerbo GX firmware version, you are either looking

at VAs (the result of calculating AC voltage * AC current) or looking at a Watts measurement. To see WATTS on the Cerbo
GX , update your Cerbo GX to the latest version (v1.21 or newer). Also make sure the firmware version in your Multi supports
Watts readout, minimum versions are xxxx154, xxxx205 and xxxx300.

4. Multis/Quattros connected to the Cerbo GX via a VE.Bus to VE.Can interface will always reports VAs, not (yet) Watts.

5. If a current sensor assistant is loaded in a Multi/Quattro and no sensor is connected it will return invalid power / kWh values.

6. If a current sensor assistant is loaded in a Multi/Quattro make sure the position is set correctly and the scale match with the

dipswitches on the sensor itself.

7. A current sensor assistant measures and reports VAs, not Watts.

Notes for systems with multiple units in parallel:

1. Cerbo GX version prior to v1.20 use the power and current reported by the master of a phase and multiplied that by the num-

ber of devices in that phase. Since version v1.20 the values of all device is summed per phase and hence should be more
accurate.

2. This revealed a bug for in the firmware of the multi when running in parallel. Ccgx v1.21 workarounds this, by falling back to

the original behavior when it sees an affected firmware version. For better readings the multi's should be updated. The bug
has been fixed in VE.Bus firmware version xxxx159, xxxx209, xxxx306. That firmware was released on February 17th 2015.

3. Multi firmware versions since 26xx207 / xxxx300 can also freeze the Power values at a certain moment in time.

Tips to prevent measurement problems:

1. Do not connect VEConfigure while the Cerbo GX is connected

2. VE.Bus is not a 100% plug and play system: if you disconnect the Cerbo GX from one Multi, and very quickly connect it to

another, it can result it wrong values. To make sure that this is not the case, use the 'redetect system' option in the Multi/
Quattro menu on the Cerbo GX .

14.7. Q7: There is a menu entry named "Multi" instead of the VE.Bus product

name

A VE.Bus system can be completely turned off, including its communication. If you turn a VE.Bus system off, and thereafter reset
the Cerbo GX, the Cerbo GX cannot obtain the detailed product name and shows “Multi” instead.

To get the proper name again, go into the Multi menu on the Cerbo GX and set the Switch menu entry to On or in case a Digital
Multi Control is present, set the physical switch to On. Note that when there is a BMS, above procedure only works when within
battery working voltages.

14.8. Q8: There is a menu entry named "Multi", while there is no Inverter, Multi

or Quattro connected

If a Cerbo GX ever saw a VE.Bus BMS or Digital Multi Control (DMC), it will remember them, until 'Redetect system' is started
from the Cerbo GX menu.After a minute, restart the Cerbo GX: Settings → General → Reboot.

14.9. Q9: When I type the ip-address of the Color Control into my browser, I see

a web page mentioning Hiawatha?

Our plan is to at least run a website where you can change settings and see the current status. If all works out as we would like
to, there might come be a fully functional version of the online VRM Portal running locally on the Cerbo GX. This allows people
without an internet connection, or an intermittent internet connection to have the same features and functionality.

14.10. Q10: I have multiple Solar chargers MPPT 150/70 running in parallel. From

which one will I see the relay status in the Cerbo GX menu?

From a random one.

14.11. Q11: How long should an automatic update take?

The size of the download typically is around 90MB. After download it will install the files which can take up to 5 minutes.

14.12. Q12: I have a VGR with IO Extender, how can I replace this with a Cerbo

GX?

It is not yet possible to replace the IO Extender functionality.

14.13. Q13: Can I use Remote VEConfigure, as I was doing with the VGR2?

Yes, see VE Power Setup manual

65

Cerbo GX Manual

14.14. Q14: The Blue Power Panel could be powered through the VE.Net net-

work, can I also do that with a Cerbo GX?

No, a Cerbo GX always needs to be powered itself.

14.15. Q15: What type of networking is used by the Cerbo GX (TCP and UDP

ports)?

Basics:

• The Cerbo GX needs to get a valid IP address from a DHCP server, including a working DNS server and gateway, or a static IP
configuration.

• DNS port 53 UDP and TCP

• NTP (time sync) UDP port 123

VRM Portal:

• Data to the VRM Portal is sent via HTTP POST and GET requests to http://ccgxlogging.victronenergy.com on port 80. Sensitive
data is sent using HTTPS on port 443 to the same host.

Firmware updates:

• The Cerbo GX connects to http://updates.victronenergy.com/ on port 443.

Remote support (default disabled):

• When enabled, an outbound SSH connection to supporthost.victronenergy.com is maintained. The Cerbo GX will try to connect
on port 22, 80 and 443, and the first that works is maintained.

• Enabling Remote Support also enables the sshd daemon, listening for incoming SSH requests on port 22. See next FAQ entry
for more information about the Remote Support functionality.

Two way communication (Remote VEConfig and Remote Firmware updates):

• Pre-v2.20: Uses HTTPS (port 443) to the Pubnub servers

• v2.20 and later: connects to mqtt-rpc.victronenergy.com on port 443

MQTT (default disabled):

• When enabled, a local MQTT broker is started, which accepts TCP connections on port 1883. The Cerbo GX will also try to
connect to the victron MQTT cloud server (mqtt.victronenergy.com) using SSL on port 8883.

Remote Console on VRM (default disabled):

• Remote Console on VRM uses the same reverse ssh tunnel as is used for Remote Support: outbound connection to suppor­thosts.victronenergy.com on port 22, 80 or 443. No port forwarding in routers is necessary to use Remote Console on VRM.
Note that supporthosts.victronenergy.com resolves to multiple IP addresses: 84.22.108.49 and 84.22.107.120.

• See here to trouble shoot Remote Console on VRM.

Remote Console on LAN (default disabled):

• Remote Console on LAN requires port 80 (small website hosted on local hiawatha webserver on Cerbo GX). And also requires
port 81, which is the listening port for the websocket tunnel to VNC.

Modbus TCP (default disabled):

• ModbusTCP server uses port 502

14.16. Q16: What is the functionality behind the menu item Remote support

(SSH), in the Ethernet menu?

When enabled, the Color Control will open a SSH connection to our secure server, with a reverse tunnel back to the Color Con­trol. Through this tunnel, Victron engineers can login to your Cerbo GX and perform remote support. This works when the Cerbo
GX is installed on an internet connection. The connection will even work when installed behind a firewall. The SSH connection will
be outbound, to port 80, 22 or 443 at supporthost.victronenergy.com. Remote support function is by default disabled.

14.17. Q17: I don’t see support for VE.Net products in the list, is that still com-

ing?

No.

66

Cerbo GX Manual

14.18. Q18: What is the data usage of the Cerbo GX?

Data usage depends heavily on amount of connected products, and behavior and usage of those products. The measurements
below are an indication only, and taken from a system with one Cerbo GX, one Multi, one BMV and one MPPT. Log interval set to
15 minutes. If you are on an expensive data-plan, do make some fail-safe.

Data consumption per month:

• VRM logging: 15MB download, 45MB upload

• Remote support: 22MB download, 40MB upload

• Update checks: 8MB download, 0.3MB upload (This does not include the update itself)

• 2 way communication: 26MB download, 48MB upload

Mentioned megabytes do not include the download of a Color Control firmware update. Firmware updates of 60MB are not un­common.

14.19. Q19: How many AC Current Sensors can I connect in one VE.Bus sys-

tem?

The current maximum is 9 sensors (since Cerbo GX v1.31). Note that each need to be configured separately with an assistant in
the Multi or Quattro to which it is wired.

14.20. Q20: Issues with Multi not starting when Cerbo GX is connected / Caution

when powering the Cerbo GX from the AC-out terminal of a VE.Bus Inverter,
Multi or Quattro

Make sure that the GX device and MultiPlus is running the latest firmware version.

If you power the Cerbo GX from an AC adaptor connected to the AC-out port of any VE.Bus product (Inverter, Multi or Quattro),
then a deadlock can occur after the VE.Bus products are powered-down for any reason (after any operational fault or during a
black start). The VE.Bus devices will not boot-up until the Cerbo GX has power …but the Cerbo GX will not boot-up until it has
power. See FAQ for more information about this.

This deadlock can be rectified by briefly unplugging the Cerbo GX VE.Bus cable at which point you will observe the VE.Bus prod­ucts will immediately begin to boot-up.

This deadlock can be avoided in two ways:

• Power the Cerbo GX from the battery; or

• Cut pin 7 in the VE.Bus cable connected to the Cerbo GX

Cutting/Removing pin 7 of the VE.Bus cable to the Cerbo GX (brown/white according to standard RJ45 ethernet cable colour cod­ing) allows the VE.Bus products to start up without waiting for the Cerbo GX to boot up first.

Note that when using a Redflow ZBM2/ZCell battery, pin 7 should be cut even if the Cerbo GX is DC powered, to avoid the same
deadlock at times when the Redflow battery cluster is at 0% SoC.

67

Cerbo GX Manual

The disadvantage of cutting pin 7 is that switching the VE.Bus device off will be less effective: although it will stop charging and
inverting, it will still be in standby mode and therefore drawing more current from the battery than if pin 7 had been left in place.
Typically this is only relevant in Marine or Automotive systems where it's normal to regularly switch the VE.Bus device off. For
those types of systems we recommend that you do not cut pin 7, but simply power the Cerbo GX from the battery.

14.21. Q21: I love Linux, programming, Victron and the Cerbo GX. Can I do

more?

Yes you can! We intend to release almost all code as open source, but we are not that far yet. What we can offer today is that
many parts of the software are in script or other non-precompiled languages, such as Python and QML, and therefore available
on your Cerbo GX and easy to change. Root password and more information is available here.

14.22. Q22: How do I change the logo

Typic the following address into the web browser of a device connected to the same network. Using this address as a tem­plate: http://[ip-here]/logo.php (inserting your device’s IP address between the square brackets). The IP address can be found by
going to Settings > Ethernet or Wifi. Once the page is loaded, Choose an image file from your device. Re-boot the GX device.

14.23. Q23: Multi restarts all the time (after every 10sec)

Please check the remote switch connection on the Multi control PCB. There should be a wire bridge between the left and middle
terminal. The Cerbo GX switches a line which enables the power of the Multi control board. After 10 seconds this line is released
and the Multi should take over from there. When the remote switch connection is not wired the Multi is unable to take over it's own
supply. The Cerbo GX will retry, the Multi will boot and after 10 seconds stop, and so on.

14.24. Q24: What is Error #42?

If the GX Device shows an Error 42 - Hardware fault. In that case, the flash storage on the device is corrupt. As a result, settings
will not be saved (rebooting resets back to default) and other problems will rise.

This error is not recoverable in the field or by repair departments. Contact your dealer for a replacement.

68

Cerbo GX Manual

Firmware versions until v2.30 did not report the error. Since v2.30; its visible on the device itself (in the GUI) and on the VRM
Portal.

14.25. GPL Note

The software included in this product contains copyrighted software that is licensed under the GPL. You may obtain the Corre­sponding Source code from us for a period of three years after our last shipment of this product.

69

Cerbo GX Manual

15. More information

• GX - Generator auto start/stop

• GX - Using Fischer Panda Generators

• GX - GSM cellular modem

• VRM Portal - Remote VEConfigure and remote firmware updates

• VRM Portal - Documentation and troubleshooting

70