FRO­NIUS Symo GEN24 3.0 User manual

Operating
Instructions
Fronius Symo GEN24
3.0 / 3.0 Plus / 4.0 / 4.0 Plus
5.0 / 5.0 Plus
42,0426,0388,EN 019-17042023
EN Operating Instructions

Contents
Safety rules 7
Explanation of safety notices 7
Safety 7
General 7
Environmental conditions 8
Qualified personnel 8
Noise emission values 8
EMC measures 9
Backup power 9
Data protection 10
Copyright 10
Protective earthing (PE) 10
General information 11
Fronius Symo GEN24 13
Device concept 13
Function overview 13
Fronius UP 14
Scope of supply 14
Intended use 14
Thermal concept 15
Fronius Solar.web 15
Local communication 16
The various operating modes 17
Operating modes – Explanation of symbols 17
Operating mode – Inverter with battery 17
Operating mode – Inverter with battery and several Smart Meters 18
Operating mode - inverter with battery, AC-coupled to another inverter 18
Operating mode – Inverter with battery and Ohmpilot 19
Operating mode – Inverter with battery and additional inverter 19
Energy flow direction of the inverter 19
Operating states (only for systems with a battery) 20
Energy saving mode 21
General 21
Switch-off conditions 21
Switch-on conditions 21
Special case 21
Indication of energy saving mode 22
Suitable batteries 23
General 23
BYD Battery-Box Premium 23
LG RESU FLEX 24
Manual system start 26
Requirements 26
Notification of system shutdown 26
Manual battery start after system shutdown 26
Starting backup power operation after a system shutdown 26
Protection of people and equipment 27
Central grid and system protection 27
WSD (wired shutdown) 27
RCMU 27
Safe state 27
Surge protective device 27
Control elements and connections 28
Connection area 28
Connection area divider 29
Ground electrode terminal 29
DC disconnector 30
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Data communication area 30
Button functions and LED status indicator 32
Internal schematic connection diagram of the IOs 33
Backup power variant - PV Point (OP) 35
General 37
PV Point (OP) 37
Explanation - PV Point (OP) 37
Installation 39
General 41
Quick-lock system 41
Warning notices on the device 41
System component compatibility 42
Installation location and position 43
Choosing the location of the inverter 43
Choosing the location of third-party batteries 44
Installation position of inverter 44
Install the mounting bracket and hang up the inverter 46
Selecting the fixing material 46
Properties of the mounting bracket 46
Do not deform the mounting bracket 46
Fitting the mounting bracket to a wall 46
Installing the mounting bracket on a mast or beam 47
Attaching the mounting bracket to mounting rails 48
Attaching the inverter to the mounting bracket 48
Prerequisites for connecting the inverter 49
Permissible cables for the electrical connection 49
Permitted cables for the data communication connection 49
Cross section of the AC cable 50
Cross section of the DC cable 51
Maximum alternating current fuse protection 51
Connecting the inverter to the public grid (AC side) 52
Safety 52
Connecting the inverter to the public grid (AC side) 52
Connecting solar module strings to the inverter 55
General comments regarding PV modules 55
Safety 55
Module array - general information 56
Module array configuration3 ‑5 kW 56
Connecting the solar module strings to the inverter 57
Connecting the battery to the inverter 61
Safety 61
Connecting the battery on the DC side 61
Connecting the LG RESU FLEX ground conductor 65
Connecting backup power - PV Point (OP) 66
Safety 66
Installation 66
Connecting the data communication cable 71
Modbus participants 71
Routing data communication cables 72
Connecting the battery communication cable 74
Terminating resistors 74
Installing the WSD (wired shutdown) 76
Closing and commissioning the inverter 77
Closing the inverter's connection area/housing cover, and commissioning 77
Starting the inverter for the first time 77
Installation with the app 78
Installation using the web browser 78
Switching off current supply and restarting the inverter 80
De-energising the inverter and switching it on again 80
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Settings - user interface of the inverter 81
User settings 83
User login 83
Selecting the language 83
Device configuration 84
Components 84
Functions andI/Os 84
Demand Response Modes (DRM) 86
Inverter 86
Energy management 89
Energy management 89
Examples - Time-dependent battery control 90
Allowed battery control rules 92
PV power reduction 94
Load management 94
System 96
General 96
Update 96
Setup wizard 96
Restoring the factory settings 96
Event log 96
Information 96
Licence manager 97
Support 98
Communication 99
Network 99
Modbus 100
Remote control 101
Fronius Solar API 101
Safety and grid requirements 103
Country setup 103
Feed-in limitation 103
Dynamic power regulation with several inverters 105
I/O power management 108
Connection diagram - 4 relay 109
I/O power management settings - 4 relays 110
Connection diagram - 3 relay 111
I/O power management settings - 3 relays 112
Connection diagram - 2 relay 113
I/O power management settings - 2 relays 114
Connection diagram - 1 relay 115
I/O power management settings - 1 relay 116
Autotest(CEI 0-21) 116
Options 119
Surge protective device (SPD) 121
General 121
Safety 121
Scope of supply 121
De-energising the inverter 122
Installation 123
Commissioning the inverter 128
DC Connector Kit GEN24 130
General 130
General comments regarding PV modules 130
Safety 130
Scope of supply 131
De-energising the inverter 131
Installation 132
Commissioning the inverter 136
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Appendix 137
Care, maintenance and disposal 139
General 139
Maintenance 139
Cleaning 139
Safety 139
Operation in dusty environments 139
Disposal 140
Guarantee provisions 142
Fronius manufacturer's warranty 142
Status codes and remedy 143
Display 143
Status Codes 143
Technical data 144
Fronius Symo GEN24 3.0 / 3.0 Plus 144
Fronius Symo GEN24 4.0 / 4.0 Plus 147
Fronius Symo GEN24 5.0 / 5.0 Plus 150
WLAN 154
Technical data of surge protective device DC SPD type 1+2 GEN24 154
Explanation of footnotes 154
Integrated DC disconnector 155
Circuit diagrams 157
Circuit Diagram - PV Point (OP) 159
Circuit Diagram 159
Circuit Diagram - PV Point (OP) Australia 160
Circuit Diagram 160
Fronius Symo GEN24 and BYD Battery-Box Premium HV 161
Circuit Diagram 161
Fronius Symo GEN24 with two BYD Battery-Box Premium HV connected in parallel 162
Circuit Diagram 162
Fronius Symo GEN24 with three BYD Battery-Box Premium HV connected in parallel 163
Circuit Diagram 163
Fronius Symo GEN24 and LG RESU FLEX 164
Circuit Diagram 164
Wiring diagram - surge protective device SPD 165
Circuit Diagram 165
Dimensions of the inverter 167
Fronius Symo GEN24 3 - 5 kW 169
Fronius Symo GEN24 3-5 kW 169
6

Safety rules
Explanation of
safety notices 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.
Safety CAUTION!
Danger from crushing due to the incorrect handling of attachments and con-
nection 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 regula-
tions regarding accident prevention and environmental protection must also be
followed.
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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 author-
ized 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.
Environmental
conditions
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 liab-
ility for any damage resulting from improper use.
Qualified per-
sonnel
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 di-
mensioned. 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 special-
ist.
It is impossible to guarantee that bought-in parts are designed and manufac-
tured to meet the demands made on them, or that they satisfy safety require-
ments. 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 temperat-
ure 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
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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 receiv-
ers). 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 disconnec-
tion on the utility side and deactivation of the replacement power mode by open-
ing 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 start-
ing current. This can be up to 10 times higher than the nominal current. The max-
imum 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.
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
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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 pur-
chaser. If you have any suggestions for improvement, or can point out any mis-
takes that you have found in the instructions, we will be most grateful for your
comments.
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 in-
verter (see Technical data), the ground conductor connection is required.
When connecting the ground conductor, ensure that it is secured against acci-
dental disconnection. All the points listed in the chapter Connecting the invert-
er to the public grid (AC side) on page 52 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 con-
ductor, the minimum cross-section requirements specified by the respective na-
tional standards and guidelines must be observed.
10

General information
11

12

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 syn-
chronized 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 in-
verter has a backup power function 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 switch-
off, interruption), the inverter will immediately stop producing power and inter-
rupt the supply of power into the grid.
The grid is monitored by monitoring the voltage, frequency and islanding condi-
tions.
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 bat-
tery* or fed into the grid.
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 out-
put 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 in-
stalled in switch cabinets).
* Depending on the device variant, suitable battery, appropriate wiring, set-
tings and local standards and guidelines.
Function over-
view Function Symo GEN24 Symo GEN24 Plus
Backup power variant - PV Point
(OP)
Battery connection* Available as an op-
tion**
Backup power variant - Full Backup
* For suitable batteries, see chapter Suitable batteries.
** The functions are optionally available via Fronius UP (see chapter Fronius
UP).
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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 (1) Housing cover
(2) Inverter
(3) Mounting bracket (illustration)
(4) Quick Start guide
(5) 2x ferrite ring with holder
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
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 39.
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.
14

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 there-
fore 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 ex-
ceeded 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.
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.
Fronius Sol-
ar.web
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 78 or Installation using the web browser on page 78.
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.
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Fronius recommends testing the Internet connection on site according to
the minimum requirements.
Local commu-
nication
The inverter can be found via the Multicast DNS protocol (mDNS). It is recom-
mended to search for the inverter by the assigned host name.
The following data can be retrieved via mDNS:
-NominalPower
-Systemname
-DeviceSerialNumber
-SoftwareBundleVersion
16

The various operating modes
Operating modes
– Explanation of
symbols
PV module
generates direct current
Fronius GEN24 inverter
converts direct current into alternating current and charges the bat-
tery (charging the battery is dependent on the device variant, suitable
batteries, the requisite cabling and settings). 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 can-
not charge a battery, and is not available in backup power mode.
Battery
is coupled to the inverter on the direct current side, and stores elec-
trical 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.
Grid
supplies the loads in the system if insufficient power is being gener-
ated by the PV modules or supplied by the battery.
Operating mode
– Inverter with
battery
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.
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00 1
6
7
1
Operating mode
– Inverter with
battery and sev-
eral Smart
Meters
00 1
6
7
1
00 1
6
7
2
Operating mode
- inverter with
battery, AC-
coupled to an-
other inverter
+
-
00 1
6
7
1
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Operating mode
– Inverter with
battery and
Ohmpilot
+
-
00 1
6
7
1
Operating mode
– Inverter with
battery and ad-
ditional inverter
In the hybrid photovoltaic system, batteries must only be connected to one in-
verter 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
7
1
Energy flow dir-
ection of the in-
verter
In the case of hybrid inverters, there are four different energy flow directions:
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AC~DC=
DC=
(1)
(2)
(4)
(3)
+
-
(1) PV module – inverter – load/grid
(2) PV module – inverter – battery*
(3) Battery – inverter – load/grid*
(4) Grid – inverter – battery*
* depending on the settings and local standards and regulations.
Operating states
(only for systems
with a battery)
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.
Min. state of charge (SOC)
achieved
Battery has reached the minimum SOC set or
specified by the manufacturer. The battery cannot
be discharged any further.
Energy saving mode
(standby)
The system has been put into energy saving mode.
Energy saving mode is automatically ended as
soon as sufficient excess energy is available again.
Start The storage system starts from energy saving
mode (standby).
Forced re-charging The inverter re-charges the battery, in order to
maintain the set minimum SOC (state of charge)
or the SOC specified by the manufacturer (pro-
tection against deep discharge).
Deactivated The battery is not active. It has either been deac-
tivated/switched off, or an error means that no
communication with the battery is possible.
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