Operating
Instructions
Fronius Primo GEN24
8.0 Plus / 10.0 Plus
Operating Instructions
EN
42,0426,0419,EN 016-24042023
Contents
Safety rules 8
Explanation of safety notices 8
Safety 8
General 8
Environmental conditions 9
Qualified personnel 9
Noise emission values 9
EMC measures 10
Backup power 10
Data protection 11
Copyright 11
Protective earthing (PE) 11
General information 13
Fronius Primo GEN24 15
Device concept 15
Function overview 15
Fronius UP 16
Scope of supply 16
Intended use 16
Thermal concept 17
Fronius Solar.web 17
Local communication 18
The various operating modes 19
Operating modes – Explanation of symbols 19
Operating mode – Inverter with battery 20
Operating mode – Inverter with battery and several Smart Meters 20
Operating mode - inverter with battery, AC-coupled to another inverter 20
Operating mode – Inverter with battery and backup power function 21
Operating mode – Inverter with battery, Ohmpilot and backup power function 21
Operating mode – Inverter with battery, further inverter and backup power function 21
Energy flow direction of the inverter 22
Operating states (only for systems with a battery) 22
Energy saving mode 24
General 24
Switch-off conditions 24
Switch-on conditions 24
Special case 24
Indication of energy saving mode 25
Suitable batteries 26
General 26
Limitations in operation 26
BYD Battery-Box Premium 26
LG RESU FLEX 27
Manual system start 29
Requirements 29
Notification of system shutdown 29
Manual battery start after system shutdown 29
Starting backup power operation after a system shutdown 29
Protection of people and equipment 30
Central grid and system protection 30
WSD (wired shutdown) 30
RCMU 30
Safe state 30
Surge protective device 30
Control elements and connections 31
Connection area 31
Connection area divider 32
EN
3
Ground electrode terminal 32
DC disconnector 33
Data communication area 33
Button functions and LED status indicator 35
Internal schematic connection diagram of the IOs 36
Backup power variant - PV Point (OP) 39
General 41
PV Point (OP) 41
Explanation - PV Point (OP) 41
Backup power variant - Full Backup 43
General 45
Prerequisites for backup power mode 45
Transitioning from feeding energy into the grid to backup power mode 45
Transitioning from backup power mode to feeding energy into the grid 45
Backup power and energy saving mode 46
Cabling variants including backup power circuits with 1-pin separation e.g. Austria or Australia
Functions 47
Transitioning from feeding energy into the grid to backup power mode 47
Transitioning from backup power mode to feeding energy into the grid 47
All-pin separation cabling variant e.g. Germany, France, Spain, UK 48
Functions 48
Transitioning from feeding energy into the grid to backup power mode 48
Transitioning from backup power mode to feeding energy into the grid 49
All-pin separation cabling variant, Italy 50
Functions 50
Transitioning from feeding energy into the grid to backup power mode 50
Transitioning from backup power mode to feeding energy into the grid 51
47
Installation 53
General 55
Quick-lock system 55
Warning notices on the device 55
System component compatibility 57
Installation location and position 58
Choosing the location of the inverter 58
Choosing the location of third-party batteries 59
Installation position of inverter 60
Install the mounting bracket and hang up the inverter 62
Selecting the fixing material 62
Properties of the mounting bracket 62
Do not deform the mounting bracket 62
Fitting the mounting bracket to a wall 62
Installing the mounting bracket on a mast or beam 63
Attaching the mounting bracket to mounting rails 64
Attaching the inverter to the mounting bracket 64
Prerequisites for connecting the inverter 65
Permissible cables for the electrical connection 65
Permitted cables for the data communication connection 66
Cross section of the AC cable 66
Cross section of the DC cable 67
Maximum alternating current fuse protection 67
Connecting the inverter to the public grid (AC side) 69
Safety 69
Connecting the inverter to the public grid (AC side) 69
Connecting solar module strings to the inverter 72
General comments regarding PV modules 72
Safety 72
Module array - general information 73
4
Module array configuration 8 ‑ 10 kW 73
Connecting the solar module strings to the inverter 74
Connecting the battery to the inverter 78
Safety 78
Connecting the battery on the DC side 78
Connecting the LG RESU FLEX ground conductor 82
Connecting backup power - PV Point (OP) 83
Safety 83
Installation 83
Connecting backup power - Full Backup 88
Safety 88
Cabling variants including backup power circuits with 1-pin separation e.g. Austria or Aus-
tralia
All-pin separation cabling variant e.g. Germany, France, Spain 89
All-pin separation cabling variant, e.g. UK 90
All-pin separation cabling variant, e.g. Italy 91
Testing backup power mode 92
Connecting the data communication cable 93
Modbus participants 93
Routing data communication cables 94
Connecting the battery communication cable 96
Terminating resistors 96
Installing the WSD (wired shutdown) 98
Closing and commissioning the inverter 99
Closing the inverter's connection area/housing cover, and commissioning 99
Starting the inverter for the first time 99
Installation with the app 100
Installation using the web browser 100
Switching off current supply and restarting the inverter 102
De-energising the inverter and switching it on again 102
88
EN
Settings - user interface of the inverter 103
User settings 105
User login 105
Selecting the language 105
Device configuration 106
Components 106
Functions andI/Os 107
Demand Response Modes (DRM) 108
Inverter 108
Energy management 111
Energy management 111
Examples - Time-dependent battery control 112
Allowed battery control rules 114
PV power reduction 116
Load management 116
System 118
General 118
Update 118
Setup wizard 118
Restoring the factory settings 118
Event log 118
Information 118
Licence manager 119
Support 120
Communication 121
Network 121
Modbus 122
Remote control 123
Fronius Solar API 123
Safety and grid requirements 125
5
Country setup 125
Feed-in limitation 125
Dynamic power regulation with several inverters 127
I/O power management 129
Connection diagram - 4 relay 130
I/O power management settings - 4 relays 131
Connection diagram - 3 relay 132
I/O power management settings - 3 relays 133
Connection diagram - 2 relay 134
I/O power management settings - 2 relays 135
Connection diagram - 1 relay 136
I/O power management settings - 1 relay 137
Autotest(CEI 0-21) 137
Options 139
Surge protective device (SPD) 141
General 141
Safety 141
Scope of supply 141
De-energising the inverter 142
Installation 143
Commissioning the inverter 148
DC Connector Kit GEN24 150
General 150
General comments regarding PV modules 150
Safety 150
Scope of supply 151
De-energising the inverter 151
Installation 152
Commissioning the inverter 156
Appendix 157
Care, maintenance and disposal 159
General 159
Cleaning 159
Maintenance 159
Safety 159
Operation in dusty environments 159
Disposal 160
Guarantee provisions 162
Fronius manufacturer's warranty 162
Components for automatic Full Backup backup power changeover 163
Components for automatic Full Backup backup power changeover 163
Status codes and remedy 165
Display 165
Status Codes 165
Technical data 166
Fronius Primo GEN24 8.0 / 8.0 Plus 166
Fronius Primo GEN24 10.0 / 10.0 Plus 169
WLAN 172
Technical data of surge protective device DC SPD type 1+2 GEN24 173
Explanation of footnotes 173
Integrated DC disconnector 174
Circuit diagrams 175
Circuit Diagram - PV Point (OP) 177
Circuit Diagram 177
Circuit Diagram - PV Point (OP) Australia 178
Circuit Diagram 178
Fronius Primo GEN24 and BYD Battery-Box Premium HV 179
Circuit Diagram 179
6
Fronius Primo GEN24 with two BYD Battery-Box Premium HV connected in parallel 180
Circuit Diagram 180
Fronius Primo GEN24 with three BYD Battery-Box Premium HV connected in parallel 181
Circuit Diagram 181
Fronius Primo GEN24 and LG RESU FLEX 182
Circuit Diagram 182
Automatic switch to backup power 1-pin double separation - e.g. Austria 183
Circuit Diagram 183
Automatic switch to backup power 1-pin single separation - e.g. Australia 184
Circuit Diagram 184
Automatic switch to backup power 2-pin double separation - e.g. Germany 185
Circuit Diagram 185
Automatic switch to backup power 2-pin single separation - e.g. France, Spain 186
Circuit Diagram 186
Automatic switch to backup power 2-pin double separation - e.g. UK 187
Circuit Diagram 187
Automatic switch to backup power 2-pin double separation with ext. grid and system protection - e.g. Italy
Circuit Diagram 188
Fronius Primo GEN24 with Enwitec Box 189
Circuit Diagram 189
Wiring diagram - surge protective device SPD 190
Circuit Diagram 190
Dimensions of the inverter 191
188
EN
Fronius Primo GEN24 8 - 10 kW 193
Fronius Primo GEN24 8 - 10 kW 193
7
Safety rules
Explanation of
safety notices
Safety
WARNING!
Indicates a potentially hazardous situation.
Death or serious injury may result if appropriate precautions are not taken.
▶
CAUTION!
Indicates a situation where damage could occur.
If not avoided, minor injury and/or damage to property may result.
▶
NOTE!
Indicates a risk of flawed results and possible damage to the equipment.
If you see any of the symbols depicted in the "Safety rules" chapter, special care
is required.
CAUTION!
Danger from crushing due to the incorrect handling of attachments and connection parts.
Injuries to limbs may result.
When lifting up, putting down and attaching the inverter, use the integrated
▶
grips.
When fitting attachments, ensure that no limbs are located between the at-
▶
tachment and the inverter.
Do not hold onto the individual poles on the terminals when locking and un-
▶
locking.
General The device has been manufactured in line with the state of the art and according
to recognised safety standards. In the event of incorrect operation or misuse,
there is a risk of
Injury or death to the operator or a third party
-
Damage to the device and other material assets belonging to the operating
-
company
All personnel involved in commissioning, maintenance, and servicing of the
device must:
Be suitably qualified
-
Have knowledge of and experience in dealing with electrical installations
-
Have fully read and precisely followed these Operating Instructions
-
In addition to the Operating Instructions, all applicable local rules and regulations regarding accident prevention and environmental protection must also be
followed.
8
All safety and danger notices on the device:
Must be kept in a legible state
-
Must not be damaged
-
Must not be removed
-
Must not be covered, pasted, or painted over
-
Only operate the device when all protection devices are fully functional. If the
protection devices are not fully functional, there is a danger of
Injury or death to the operator or a third party
-
Damage to the device and other material assets belonging to the operating
-
company
Any safety devices that are not fully functional must be repaired by an authorized specialist before the device is switched on.
Never bypass or disable protection devices.
For the location of the safety and danger notices on the device, refer to the
chapter headed "Warning notices on the device" in the Operating Instructions for
your device.
Faults that could compromise safety must be remedied before switching on the
device.
EN
Environmental
conditions
Qualified personnel
Operation or storage of the device outside the stipulated area will be deemed as
not in accordance with the intended purpose. The manufacturer accepts no liability for any damage resulting from improper use.
The servicing information contained in these operating instructions is intended
only for the use of qualified service engineers. An electric shock can be fatal. Do
not carry out any actions other than those described in the documentation. This
also applies to qualified personnel.
All cables and leads must be secured, undamaged, insulated and adequately dimensioned. Loose connections, scorched, damaged or inadequately dimensioned
cables and leads must be immediately repaired by authorised personnel.
Maintenance and repair work must only be carried out by an authorised specialist.
It is impossible to guarantee that bought-in parts are designed and manufactured to meet the demands made on them, or that they satisfy safety requirements. Use only original spare parts (also applies to standard parts).
Do not carry out any alterations, installations, or modifications to the device
without first obtaining the manufacturer's permission.
Components that are not in perfect condition must be changed immediately.
Noise emission
values
The sound power level of the inverter is specified in the Technical data.
The device is cooled as quietly as possible with the aid of an electronic temperature control system; this depends on the amount of converted power, the ambient
temperature, the level of soiling of the device, etc.
It is not possible to provide a workplace-related emission value for this device
because the actual sound pressure level is heavily influenced by the installation
9
situation, the grid quality, the surrounding walls and the properties of the room
in general.
EMC measures In certain cases, even though a device complies with the standard limit values for
emissions, it may affect the application area for which it was designed (e.g., when
there is equipment that is susceptible to interference at the same location, or if
the site where the device is installed is close to either radio or television receivers). If this is the case, then the operator is obliged to take action to rectify the
situation.
Backup power This system has backup power functions. This enables a replacement power sup-
ply to be established in the event of a failure in the public grid.
Where an automatic backup power supply is installed, a backup power warning
notice (https://www.fronius.com/en/search-page, item number: 42,0409,0275)
must be fitted on the electrical distributor.
Maintenance and installation work in the home network requires both disconnection on the utility side and deactivation of the replacement power mode by opening the integrated DC disconnector on the inverter.
Depending on the insolation conditions and the battery state of charge, the
backup power supply is automatically deactivated and activated. This can cause
the backup power supply to unexpectedly return from standby mode. Therefore,
installation work can only be performed on the home network when the backup
power supply is deactivated.
Influencing factors on the total power in backup power mode:
Reactive power
Electrical loads with a power factor not equal to 1 also require reactive power in
addition to effective power. The reactive power also loads the inverter. Therefore,
to correctly calculate the actual total power, it is not the rated power of the load
that is relevant, but the current caused by effective and reactive power.
Devices with a high reactive power are mainly electric motors such as:
Water pumps
-
Circular saws
-
Blowers and fans
-
High starting current
Electrical loads that need to accelerate a large mass usually require a high starting current. This can be up to 10 times higher than the nominal current. The maximum current of the inverter is available for the starting current. Loads with too
high starting currents therefore cannot be started/operated, even though the
nominal power of the inverter suggests that they can. When dimensioning the
backup power circuit, the connected load power and any starting current must
also be taken into account.
10
Devices with high starting currents are, for example:
Devices with electric motors (e.g. lifting platform, circular saws, planing
-
bench)
Devices with large transmission ratio and flywheel mass
-
Devices with compressors (e.g. compressed air compressors, air conditioning
-
systems)
IMPORTANT!
Very high starting currents can cause short-term distortion or a drop in output
voltage. The simultaneous operation of electronic devices in the same backup
power supply system should be avoided.
IMPORTANT!
The inverter may only be operated within the limits of its technical capabilities.
Operation outside of its technical capabilities can cause the inverter to shut
down.
Data protection The user is responsible for the safekeeping of any changes made to the factory
settings. The manufacturer accepts no liability for any deleted personal settings.
Copyright Copyright of these operating instructions remains with the manufacturer.
The text and illustrations are all technically correct at the time of printing. We
reserve the right to make changes. The contents of the operating instructions
shall not provide the basis for any claims whatsoever on the part of the purchaser. If you have any suggestions for improvement, or can point out any mistakes that you have found in the instructions, we will be most grateful for your
comments.
EN
Protective
earthing (PE)
Connection of a point in the device, system or installation to earth to protect
against electric shock in the event of a fault. When installing a safety class 1 inverter (see Technical data), the ground conductor connection is required.
When connecting the ground conductor, ensure that it is secured against accidental disconnection. All the points listed in the chapter Connecting the invert-
er to the public grid (AC side) on page 69 must be observed. It must be ensured
that when using the strain relief devices, the ground conductor is the last to be
disconnected in the event of a possible failure. When connecting the ground conductor, the minimum cross-section requirements specified by the respective national standards and guidelines must be observed.
11
12
General information
13
14
Fronius Primo GEN24
Device concept The inverter transforms the direct current generated by the solar modules into
alternating current. This alternating current is fed into the public grid and synchronized with the grid voltage in use. Moreover, the solar energy can also be
stored in a connected battery for later use.
The inverter is intended for use in grid-connected photovoltaic systems. The inverter has backup power functions and switches to backup power mode if it has
been wired accordingly*.
The inverter automatically monitors the public grid. Whenever conditions in the
electric grid are inconsistent with standard conditions (for example, grid switchoff, interruption), the inverter will immediately stop producing power and interrupt the supply of power into the grid.
The grid is monitored by monitoring the voltage, frequency and islanding conditions.
After installation and commissioning, the inverter's operation is fully automatic;
the inverter draws the maximum possible power from the PV modules.
Depending on the operating point, this power is used in the home, stored in a battery* or fed into the grid.
EN
Function overview
As soon as the energy provided by the PV modules is no longer sufficient, the
power from the battery is fed into the home. Depending on the setting, power
may also be obtained from the public grid in order to charge the battery*.
When its temperature gets too high, the inverter automatically reduces the output or charging power, or switches off completely, in order to protect itself.
Reasons for the temperature being too high include a high ambient temperature
or insufficient heat dissipation (for example, inadequate heat dissipation when installed in switch cabinets).
* Depending on the device variant, suitable battery, appropriate wiring, set-
tings and local standards and guidelines.
Function Primo GEN24 Primo GEN24 Plus
Backup power variant - PV Point
(OP)
Battery connection*
Backup power variant - Full Backup
Available as an op-
tion**
Available as an op-
tion**
* For suitable batteries, see chapter Suitable batteries.
** The functions are optionally available via Fronius UP (see chapter Fronius
UP).
15
Fronius UP With Fronius UP*, the inverter can be expanded by the authorised specialist to
include optionally available functions (see chapter Function overview).
* The availability of Fronius UP varies from country to country. For more in-
formation on Fronius UP and availability, see Installation guide: Fronius
GEN24 & GEN24 Plus.
Scope of supply
Intended use The inverter is designed to convert direct current from PV modules into alternat-
ing current and feed this power into the public grid. A backup power mode* is
possible provided that appropriate cabling has been installed.
The following are considered improper use:
Utilisation for any other purpose, or in any other manner
-
Alterations to the inverter are not permitted unless expressly recommended
-
by Fronius
Installation of components is not permitted unless expressly recommended
-
or sold by Fronius
(1) Housing cover
(2) Inverter
(3) Mounting bracket (illustration)
(4) Quick Start guide
16
The manufacturer is not responsible for any damage resulting from improper use.
All warranty claims are considered void in such cases.
Intended use also means:
Carefully reading and obeying all the instructions, as well as safety
-
and danger notices in the Operating Instructions
Installation in accordance with chapter "Installation" from page 53.
-
When designing the photovoltaic system, ensure that all components of the
photovoltaic system are operated exclusively within their permissible operating
range.
Take into account the grid operator's regulations for energy fed into the grid and
connection methods.
The Fronius GEN24 inverter is a grid-connected inverter with a backup power
function – it is not a stand-alone inverter. The following restrictions must therefore be observed in backup power mode:
Backup power mode may be in operation for at max. 2000 hours
-
Backup power mode may be in operation for more than 2000 operating hours
-
if 20% of the duration of the inverter's grid power feed operation is not exceeded at the relevant time.
* Depending on the device variant, suitable battery, appropriate wiring, set-
tings, and local standards and guidelines.
Thermal concept Ambient air is drawn in by the fan on
the front side and blown out at the
device sides. The even heat dissipation
allows several inverters to be installed
next to each other.
EN
Fronius Solar.web
NOTE!
Risk due to insufficient cooling of the inverter.
This may result in a loss of power in the inverter.
Do not block the fan (for example, with objects that protrude through the
▶
touch guard).
Do not cover the ventilation slots, even partially.
▶
Make sure that the ambient air can always flow through the inverter's ventila-
▶
tion slots unimpeded.
With Fronius Solar.web or Fronius Solar.web Premium, the PV system can be
easily monitored and analysed by the system owner and installer. If configured
accordingly, the inverter transmits data such as power, yields, load, and energy
balance to Fronius Solar.web. For more information see Solar.web - monitoring &
analysis.
Configuration is carried out via the setup wizard, see chapter Installation with
the app on page 100 or Installation using the web browser on page 100.
Prerequisites for configuration:
Internet connection (download: min. 512 kBit/s, upload: min. 256 kBit/s)*.
-
User account on solarweb.com.
-
Completed configuration via the setup wizard.
-
* The information given does not constitute an absolute guarantee of fault-
less function. High error rates in the transmission, reception fluctuations
or transmission drop-outs can have a negative effect on the data transfer.
17
Fronius recommends testing the Internet connection on site according to
the minimum requirements.
Local communication
The inverter can be found via the Multicast DNS protocol (mDNS). It is recommended to search for the inverter by the assigned host name.
The following data can be retrieved via mDNS:
NominalPower
-
Systemname
-
DeviceSerialNumber
-
SoftwareBundleVersion
-
18
The various operating modes
EN
Operating modes
– Explanation of
symbols
PV module
generates direct current
Fronius GEN24 inverter
converts direct current into alternating current and charges the battery (battery charging is only possible with Fronius GEN24 Plus inverters). The integrated system monitoring enables the inverter to be integrated into a network by means of WLAN.
Additional inverter in the system
converts the direct current into alternating current. However, it cannot charge a battery, and is not available in backup power mode.
Battery
is coupled to the inverter on the direct current side, and stores electrical energy.
Fronius Ohmpilot
for using excess energy to heat water.
Primary meter
records the system's load curve and provides measurement data for
energy profiling in Fronius Solar.web. The primary meter also controls
the dynamic feed-in control.
Secondary meter
records the load curve of individual loads (e.g. washing machine,
lamps, TV, heat pump, etc.) in the consumption branch and provides
measurement data for energy profiling in Fronius Solar.web.
Loads in the PV system
are the loads connected in the system.
Additional loads and generators in the system
are connected to the system by means of a Smart Meter.
PV Point
is a non-uninterruptible 1‑phase backup power circuit which supplies
electrical devices with up to 3 kW if sufficient power is available from
the PV modules or the battery.
Full Backup
the inverter is prepared for backup power mode. The backup power
mode must be implemented in the switch cabinet by the electrician
performing the installation. The PV system operates in a stand-alone
manner in backup power mode.
Grid
supplies the loads in the system if insufficient power is being generated by the PV modules or supplied by the battery.
19
Operating mode
00
1
6
1
00
1
6
1
00
1
6
2
+
-
00
1
6
1
– Inverter with
battery
Operating mode
– Inverter with
battery and several Smart
Meters
In order to be able to obtain the highest rate of self-consumption with your PV
system, a battery can be used to store excess energy. The battery is coupled to
the inverter on the direct current side. Multiple current conversion is therefore
not required, and the efficiency is increased.
Operating mode
- inverter with
battery, ACcoupled to another inverter
20
Operating mode
+
-
00
1
6
1
+
-
00
1
6
1
– Inverter with
battery and
backup power
function
IMPORTANT!
In backup power mode, an increased nominal frequency is used in order to prevent undesired parallel operation with other power generators.
In the fully equipped hybrid PV system, the inverter can:
Supply loads in the house
-
Store excess energy in the battery and/or feed it into the grid
-
Supply connected loads in the event of a power failure
-
EN
Operating mode
– Inverter with
battery, Ohmpilot and backup
power function
Operating mode
– Inverter with
battery, further
inverter and
backup power
function
IMPORTANT!
In the fully equipped hybrid PV system with a Fronius Ohmpilot, the Ohmpilot
cannot be operated in the event of a power failure for regulatory reasons. It is
therefore sensible to install the Ohmpilot outside of the backup power branch.
In the hybrid photovoltaic system, batteries must only be connected to one inverter with battery support. Batteries cannot be split between multiple inverters
with battery support. However, depending on the battery manufacturer, several
batteries can be combined on one inverter.
21
+
-
00
1
6
1
Energy flow dir-
AC~DC=
DC=
(1)
(2)
(4)
(3)
+
-
ection of the inverter
In the case of hybrid inverters, there are four different energy flow directions:
(1) PV module – inverter – load/grid
Operating states
(only for systems
with a battery)
22
(2) PV module – inverter – battery*
(3) Battery – inverter – load/grid*
(4) Grid – inverter – battery*
* depending on the settings and local standards and regulations.
Battery systems distinguish different operating states. In this case, the relevant
current operating state is displayed on the user interface of the inverter or in
Solar.web.
Operating state Description
Normal operation Energy is stored or drawn, as required.
Operating state Description
Min. state of charge (SOC)
achieved
Energy saving mode
(standby)
Start The storage system starts from energy saving
Forced re-charging The inverter re-charges the battery, in order to
Deactivated The battery is not active. It has either been deac-
Battery has reached the minimum SOC set or
specified by the manufacturer. The battery cannot
be discharged any further.
The system has been put into energy saving mode.
Energy saving mode is automatically ended as
soon as sufficient excess energy is available again.
mode (standby).
maintain the set minimum SOC (state of charge)
or the SOC specified by the manufacturer (protection against deep discharge).
tivated/switched off, or an error means that no
communication with the battery is possible.
EN
23
Energy saving mode
General Energy saving mode (standby mode) is used to reduce the self-consumption of
the system. Both the inverter and the battery automatically switch to energy saving mode under certain conditions.
The inverter switches to energy saving mode if the battery is flat and no PV
power is available. Only the inverter's communication with the Fronius Smart
Meter and Fronius Solar.web is maintained.
Switch-off conditions
Switch-on conditions
If all the switch-off conditions are met, the battery switches into energy saving
mode within ten minutes. This time delay ensures that the inverter can at least be
restarted.
The battery state of charge is less than or equal to the input
minimum state of charge.
The current charging or discharging power of the battery is
less than 100 W.
Less than 50 W is available for charging the battery. The
power of feeding into the public grid is at least 50 W less than
the power currently required in the home network.
The inverter automatically switches into energy saving mode, following the battery.
If one of the following conditions is met for at least 30 seconds, energy saving
mode is ended:
Energy saving mode is no longer permissible owing to a changed setting on
-
the user interface of the inverter.
If dynamic power reduction of 0 is set, or if the system is operating in backup
-
power mode, the power of feeding into the public grid is always less than the
required power in the home network.
There is a separate condition for this case (dynamic power reduction < 300 W
or active backup power mode):
If the PV power is above a specified threshold, energy saving mode is
-
ended.
Battery charging from the public grid is requested via the user interface of
-
the inverter.
The battery is being recharged in order to restore the minimum state of
-
charge or perform calibration.
Special case If the inverter does not operate for 12 minutes (e.g. fault), or there is an interrup-
tion in the electrical connection between the inverter and the battery and there
is no backup power mode, the battery switches to energy-saving mode in any
case. This reduces self discharge of the battery.
24
Indication of en-
5
%
Energy-saving mode
ergy saving
mode
During energy saving mode:
Operating LED for the inverter lights up orange (see Button functions and
-
LED status indicator on page 35).
The user interface of the inverter can be reached.
-
All the available data is saved and transmitted to Solar.web.
-
The real-time data can be seen on Solar.web.
-
Energy saving mode is shown on the
user interface of the inverter and in
Solar.web by an "i" beside the battery
symbol in the system overview.
EN
25
Suitable batteries
General Fronius explicitly points out that the third-party batteries are not Fronius
products. Fronius is not the manufacturer, distributor or retailer of these batteries. Fronius accepts no liability and offers no service or guarantees for these batteries.
Obsolete firmware/software states may lead to incompatibilities between the inverter and the battery. In this case, the following steps are to be performed:
Update battery software – see the battery documentation.
1
Update inverter firmware – see Update on page 118.
2
Read this document and the Installation Instructions before installing and commissioning the external battery. The documentation is either enclosed with the
external battery or can be obtained from the battery manufacturer or their service partners
All documents associated with the inverter can be found at the following address:
https://www.fronius.com/en/solar-energy/installers-partners/service-support/
tech-support
Limitations in
operation
BYD BatteryBox Premium
If the DC voltage exceeds 520 V, the battery can no longer be charged or discharged. The voltage of 520 V is rarely exceeded during normal operation of the
inverter.
When the output power of the inverter is reduced, the operating point shifts towards higher DC voltages. The following conditions during normal operation can
lead to the DC voltage of 520 V being exceeded:
Overdimensioning of the PV generator.
-
Feed-in limitation (e.g. zero feed-in).
-
Specifications of the grid operator (e.g. mains voltage-dependent power re-
-
duction).
Backup power mode. If the 520 V voltage is exceeded during backup power,
-
backup power operation may be restricted. Therefore, an open circuit voltage
of max. 520 V is recommended.
BYD Battery-Box Premium HVS 5.1 7.7 10.2 12.8
Fronius Primo GEN24 8.0 - 10.0*
Fronius Primo GEN24 8.0 - 10.0 Plus
Number of battery modules 2 3 4 5
26
Battery parallel operation**
BYD Battery-Box Premium HVM 8.3 11.0 13.8 16.6 19.3 22.1
Fronius Primo GEN24 8.0 - 10.0*
BYD Battery-Box Premium HVM 8.3 11.0 13.8 16.6 19.3 22.1
Fronius Primo GEN24 8.0 - 10.0 Plus
Number of battery modules 3 4 5 6 7 8
Battery parallel operation**
* Battery support optionally available.
** Max. 3 batteries with the same capacity can be combined.
IMPORTANT!
According to the manufacturer's specifications, the max. DC cable length is 20
m. More detailed information can be found in the manufacturer's documents.
IMPORTANT!
To ensure reliable operation with a BYD Battery-Box Premium, the following
switch-on sequence for the system must always be observed.
1
Switch on the battery.
EN
LG RESU FLEX
2
Set the DC disconnector to the "On"
switch position. Switch on the automatic circuit breaker.
LG RESU FLEX 8.6 12.9 17.2
Fronius Primo GEN24 3.0 - 10.0*
27
LG RESU FLEX 8.6 12.9 17.2
Fronius Primo GEN24 3.0 - 10.0 Plus
Number of battery modules 2 3 4
* Battery support optionally available.
IMPORTANT!
According to the manufacturer's specifications, the max. DC cable length is 30
m. More detailed information can be found in the manufacturer's documents.
Switching on the battery
1
Pull off the cover to the right.
2
Pull off the cover of the DC disconnector to the front. Set the DC disconnector to the "On" switch position.
To refit the battery, follow the steps listed above in reverse order.
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Manual system start
Requirements There is no energy available from the PV modules or from the public grid. If
backup power operation or battery operation are not possible (e.g. deep discharge protection of the battery), the inverter and battery switch off.
EN
Notification of
system shutdown
Manual battery
start after system shutdown
Starting backup
power operation
after a system
shutdown
Status codes about the inactive state of the battery are displayed on the user interface of the inverter or sent via Solar.web by means of SMS or e-mail (only if
notification via Solar.web is configured accordingly).
As soon as energy is available again, the inverter starts operation automatically;
however the battery must be started manually. The switch-on sequence must be
observed for this, see chapter Suitable batteries on page 26.
The inverter requires energy from the battery to start backup power operation.
This is done manually on the battery; further information on the power supply for
restarting the inverter via the battery can be found in the battery manufacturer's
Operating Instructions.
29
Protection of people and equipment
Central grid and
system protection
WSD (wired
shutdown)
RCMU The inverter is equipped with a universal current-sensitive residual current monit-
The inverter offers the option to use the integrated AC relays as coupling
switches in conjunction with a central grid and system protection unit (in accordance with VDE-AR-N 4105:2018:11 §6.4.1). For this purpose, the central trigger
device (switch) must be integrated into the WSD chain as described in the
chapter "WSD (Wired Shut Down)".
The wired shutdown (WSD) interrupts the inverter feeding energy into the grid if
the trigger device (switch, e.g. emergency stop or fire alarm switch) has been activated.
If an inverter (secondary device) fails, it is bypassed and the other inverters continue operating. If a second inverter (secondary device) or the inverter (primary
device) fails, the operation of the entire WSD chain is interrupted.
For installation, see Installing the WSD (wired shutdown) on page 98.
oring unit (RCMU = Residual Current Monitoring Unit) in accordance with IEC
62109-2 and IEC63112.
This device monitors residual currents from the PV module to the AC output of
the inverter and disconnects the inverter from the grid in the event of unauthorised residual current.
Safe state If one of the following safety devices trips, the inverter will change to a safe
state:
WSD
-
insulation measurement and
-
RCMU
-
In the safe state, the inverter no longer feeds into the grid and is disconnected
from the grid by opening the AC relays.
Surge protective
device
The inverter is equipped with an integrated surge protective device on the DC
and AC side in accordance with IEC 62109-2. The surge protective device protects the system against damage in the event of a surge.
30
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