Operating
Instructions
Fronius Symo GEN24
6.0 / 6.0.Plus / 8.0 / 8.0 Plus
10.0 / 10.0 Plus
Operating Instructions
EN
42,0426,0315,EN 019-18042023
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 Symo 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 and Ohmpilot 21
Operating mode – Inverter with battery, Ohmpilot and backup power function 21
Operating mode – Inverter with battery and additional inverter 22
Operating mode – Inverter with battery, further inverter and backup power function 22
Energy flow direction of the inverter 23
Operating states (only for systems with a battery) 23
Energy saving mode 25
General 25
Switch-off conditions 25
Switch-on conditions 25
Special case 25
Indication of energy saving mode 26
Suitable batteries 27
General 27
BYD Battery-Box Premium 27
LG RESU FLEX 28
Manual system start 30
Requirements 30
Notification of system shutdown 30
Manual battery start after system shutdown 30
Starting backup power operation after a system shutdown 30
Protection of people and equipment 31
Central grid and system protection 31
WSD (wired shutdown) 31
RCMU 31
Safe state 31
Surge protective device 31
Control elements and connections 32
Connection area 32
EN
3
Connection area divider 33
Ground electrode terminal 33
DC disconnector 34
Data communication area 34
Button functions and LED status indicator 36
Internal schematic connection diagram of the IOs 37
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 3-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 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 56
Installation location and position 57
Choosing the location of the inverter 57
Choosing the location of third-party batteries 58
Installation position of inverter 58
Install the mounting bracket and hang up the inverter 60
Selecting the fixing material 60
Properties of the mounting bracket 60
Do not deform the mounting bracket 60
Fitting the mounting bracket to a wall 60
Installing the mounting bracket on a mast or beam 61
Attaching the mounting bracket to mounting rails 62
Attaching the inverter to the mounting bracket 62
Prerequisites for connecting the inverter 63
Permissible cables for the electrical connection 63
Permitted cables for the data communication connection 63
Cross section of the AC cable 64
Cross section of the DC cable 65
Maximum alternating current fuse protection 65
Connecting the inverter to the public grid (AC side) 66
Safety 66
Connecting the inverter to the public grid (AC side) 66
Connecting solar module strings to the inverter 69
General comments regarding PV modules 69
Safety 69
4
Module array - general information 70
Module array configuration6 - 10 kW 70
Connecting the solar module strings to the inverter 71
Connecting the battery to the inverter 75
Safety 75
Connecting the battery on the DC side 75
Connecting the LG RESU FLEX ground conductor 79
Connecting backup power - PV Point (OP) 80
Safety 80
Installation 80
Connecting backup power - Full Backup 85
Safety 85
Cabling variants including backup power circuits with 3-pin separation e.g. Austria or Aus-
tralia
All-pin separation cabling variant e.g. Germany, France, Spain 86
All-pin separation cabling variant, e.g. Italy 87
Testing backup power mode 88
Connecting the data communication cable 89
Modbus participants 89
Routing data communication cables 90
Connecting the battery communication cable 92
Terminating resistors 92
Installing the WSD (wired shutdown) 94
Closing and commissioning the inverter 95
Closing the inverter's connection area/housing cover, and commissioning 95
Starting the inverter for the first time 95
Installation with the app 96
Installation using the web browser 96
Switching off current supply and restarting the inverter 98
De-energising the inverter and switching it on again 98
85
EN
Settings - user interface of the inverter 99
User settings 101
User login 101
Selecting the language 101
Device configuration 102
Components 102
Functions andI/Os 103
Demand Response Modes (DRM) 104
Inverter 104
Energy management 107
Energy management 107
Examples - Time-dependent battery control 108
Allowed battery control rules 110
PV power reduction 112
Load management 112
System 114
General 114
Update 114
Setup wizard 114
Restoring the factory settings 114
Event log 114
Information 114
Licence manager 115
Support 116
Communication 117
Network 117
Modbus 118
Remote control 119
Fronius Solar API 119
Safety and grid requirements 121
5
Country setup 121
Feed-in limitation 121
Dynamic power regulation with several inverters 123
I/O power management 126
Connection diagram - 4 relay 127
I/O power management settings - 4 relays 128
Connection diagram - 3 relay 129
I/O power management settings - 3 relays 130
Connection diagram - 2 relay 131
I/O power management settings - 2 relays 132
Connection diagram - 1 relay 133
I/O power management settings - 1 relay 134
Autotest(CEI 0-21) 134
Options 137
Surge protective device (SPD) 139
General 139
Safety 139
Scope of supply 139
De-energising the inverter 140
Installation 141
Commissioning the inverter 146
DC Connector Kit GEN24 148
General 148
General comments regarding PV modules 148
Safety 148
Scope of supply 149
De-energising the inverter 149
Installation 150
Commissioning the inverter 154
Appendix 155
Care, maintenance and disposal 157
General 157
Maintenance 157
Cleaning 157
Safety 157
Operation in dusty environments 157
Disposal 158
Guarantee provisions 160
Fronius manufacturer's warranty 160
Components for automatic Full Backup backup power changeover 161
Components for automatic Full Backup backup power changeover 161
Status codes and remedy 163
Display 163
Status Codes 163
Technical data 164
Fronius Symo GEN24 6.0 / 6.0 Plus 164
Fronius Symo GEN24 8.0 / 8.0 Plus 167
Fronius Symo GEN24 10.0 / 10.0 Plus 171
WLAN 174
Technical data of surge protective device DC SPD type 1+2 GEN24 175
Explanation of footnotes 175
Integrated DC disconnector 176
Circuit diagrams 177
Circuit Diagram - PV Point (OP) 179
Circuit Diagram 179
Circuit Diagram - PV Point (OP) Australia 180
Circuit Diagram 180
Fronius Symo GEN24 and BYD Battery-Box Premium HV 181
6
Circuit Diagram 181
Fronius Symo GEN24 with two BYD Battery-Box Premium HV connected in parallel 182
Circuit Diagram 182
Fronius Symo GEN24 with three BYD Battery-Box Premium HV connected in parallel 183
Circuit Diagram 183
Fronius Symo GEN24 and LG RESU FLEX 184
Circuit Diagram 184
Automatic switch to backup power 3-pin double FRT-capable separation - e.g. Austria 185
Circuit Diagram 185
Automatic switch to backup power 3-pin double separation - e.g. Austria 186
Circuit Diagram 186
Automatic switch to backup power 3-pin single separation- e.g. Australia 187
Circuit Diagram 187
Automatic switch to backup power 3-pin double separation with ext. Grid and system protection
Circuit Diagram 188
Automatic switch to backup power 4-pin double separation - e.g. Germany 189
Circuit Diagram 189
Automatic switch to backup power 4-pin single separation- e.g. France, Spain 190
Circuit Diagram 190
Automatic switch to backup power 4-pin double separation with ext. grid and system protection - e.g. Italy
Circuit Diagram 191
Wiring diagram - surge protective device SPD 192
Circuit Diagram 192
188
191
EN
Dimensions of the inverter 193
Fronius Symo GEN24 6 -10 kW 195
Fronius Symo GEN24 6 - 10 kW 195
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 of 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.
Load unbalance
When dimensioning three-phase backup power networks, the total output power
and the power output per phase of the inverter must be taken into account.
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 66 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 Symo 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 Symo GEN24 Symo 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
(5) 2x ferrite ring with holder
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 96 or Installation using the web browser on page 96.
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 and
Ohmpilot
Operating mode
– Inverter with
battery, Ohmpilot 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.
21
+
-
00
1
6
1
Operating mode
+
-
00
1
6
1
– Inverter with
battery and additional inverter
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.
Operating mode
– Inverter with
battery, further
inverter and
backup power
function
22
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.
+
-
00
1
6
1
AC~DC=
DC=
(1)
(2)
(4)
(3)
+
-
EN
Energy flow direction 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)
(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.
23
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.
24
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.
EN
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.
25
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 36).
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.
26
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 114.
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
EN
BYD BatteryBox Premium
BYD Battery-Box Premium HVS 5.1 7.7 10.2 12.8
Fronius Symo GEN24 6.0 - 10.0*
Fronius Symo GEN24 6.0 - 10.0 Plus
Number of battery modules 2 3 4 5
Battery parallel operation**
BYD Battery-Box Premium HVM 8.3 11.0 13.8 16.6 19.3 22.1
Fronius Symo GEN24 6.0 - 10.0*
Fronius Symo GEN24 6.0 - 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. Max. 2 batteries
can be combined with BYD Battery-Box Premium HVM 22.1.
27
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.
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 Symo GEN24 3.0 - 10.0*
Fronius Symo GEN24 3.0 - 10.0 Plus
28
Number of battery modules 2 3 4
* Battery support optionally available.
Switching on the battery
1
Pull off the cover to the right.
EN
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.
29
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.
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 27.
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.
30
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