APPLICATION GUIDE
SETTING UP FULL BATTERY BACKUP
WITH FRONIUS SYMO GEN24 PLUS (6 - 10)
THIS DOCUMENT AIMS TO PROVIDE EASY-TO-FOLLOW INSTRUCTIONS ON HOW TO BEST DEPLOY
THE BATTERY BACKUP FUNCTION OF FRONIUS SYMO GEN24 PLUS (6 - 10) INVERTER SYSTEM
Application Guide
© Fronius Australia Pty Ltd.
Version 3.0/2021
Fronius reserves all rights, in particular rights of reproduction, distribution and translation.
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You are hereby reminded that the information published in this document, despite exercising the greatest of care in its
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Gender-specific wording refers equally to female and male form.
(c) Fronius Australia Pty. Ltd, 2021 1/16
Date
Version
Comments
Author
08/09/21
3.0
Multiple major changes
Fronius Australia
06/11/20
1.1
Figure 1 updated and other minor changes
Fronius Australia
28/10/20
1.0
Initial release
Fronius Australia
1. CHANGE LOG
2. GENERAL
Fronius Symo GEN24 Plus (6 - 10) offers the opportunity to supply select electrical loads (1 and/or 3-phase) or
possibly entire household during grid outages. This functionality is referred to as Full Backup function.
This solution works in combination with an energy storage system and supplies electrical loads whenever
sufficient energy is available.
Key features are:
Supply electrical loads in grid outage (1 and/or 3-phase loads),
Automatic switch to backup power in the event of grid failure,
Efficient energy flows due to the Multi-Flow Technology, even in backup power situation.
o This means even in backup mode PV is operational and could charge the battery.
3. REQUIREMENTS
Basic requirements for using the full backup functionality are correctly installed and configured:
Fronius Smart Meter,
Compatible BYD battery,
External backup control and switchover components.
Having PV installed is optional, but recommended because it could charge the battery in backup mode during
sun hours (if sufficient power is available) which makes this solution self-sustainable.
For successful integration please make sure the following items are ticked:
Inverter is Fronius Symo GEN24 6.0/8.0/10.0 Plus,
Suitable battery is installed,
Inverter+Battery capacity is suitable for the backup loads,
Fronius Smart Meter is correctly installed (feed-in point),
Correct Hardware is applied,
Correct Software Settings is applied,
Warning notice - Backup Power Supply is installed, see appendix A,
Backup power checklist is completed, see appendix B.
(c) Fronius Australia Pty. Ltd, 2021 2/16
4. TECHNICAL INFORMATION
4.1 Battery compatibility
Compatible batteries are listed below.
Table 4.1.a: Symo GEN24 Plus compatible BYD batteries
4.2 BYD Battery-Box Premium information
Key relevant specifications of the BYD Battery-Box Premium batteries are shown below. For more information
please visit BYD’s online documentation available here.
Table 4.2.a: BYD Battery-Box HVS/HVM Premium specifications
Table 4.2.b: Charging/discharging capability of Fronius Symo GEN24 Plus and BYD HVM/HVS
It is possible to combine multiple BYD batteries to increase energy storage capacity, with key information show
below. Compatibility confirmation it is available here.
Table 4.2.c: Compatibility with paralleled BYD HVM/HVS batteries.
* Follow BYD's installation manual on correct installation/configuration instructions when paralleling multiple batteries.
(c) Fronius Australia Pty. Ltd, 2021 3/16
4.3 Symo GEN24 Plus information
Fronius Symo GEN24 Plus inverter is available in a few different power classes ranging from 3.0 to 10.0 kVA.
However, full backup functionality (due to capacity constraints) is only available for power classes of 6 kVA, 8
kVA, and 10 kVA. Inverter's technical details are shown below.
Table 4.3.a: Symo GEN24 6.0/8.0/10.0 Plus technical details
(c) Fronius Australia Pty. Ltd, 2021 4/16
Power Class
6.0
8.0
10.0
Total Power Continuous [VA]
6000
8000
10000
Overload (5 sec) [VA]
12400
12400
12400
Power Per Phase
Continuous [VA]
3680
3680
3680
Overload (5 sec) [VA]
4133
4133
4133
Phase loads
L1 loads
L2 loads
L3 loads
Total loads
Comment
Example 1
1 kW / 1 kVA
3 kW / 3 kVA
2 kW / 2 kVA
6 kW / 6 kVA
Battery capacity surpassed
Example 2
4 kW / 4 kVA
0 / 0
0 / 0
4 kW / 4 kVA
Inverter overload (L1)
Example 3
2 kW / 2 kVA
2 kW / 2.5 kVA
0 kW /0 kVA
4 kW / 4.5 kVA
Ok
Phase loads
L1 loads
L2 loads
L3 loads
Total loads
Comment
Example 1
1 kW / 1 kVA
3.5 kW / 3.5 kVA
2 kW / 2 kVA
6.5 kW / 6.5 kVA
Ok
Example 2
0 / 0
5 kW / 5 kVA
0 / 0
5 kW / 5 kVA
Inverter overload (L2)
Example 3
3 kW / 3.5 kVA
2 kW / 3 kVA
3 kW / 3.5 kVA
8.5 kW / 10 kVA
Ok
1
4.4 Backup Capability - Nominal and Overload
Continuous and overload capability1 of the inverters are listed below.
Table 4.4.a: AC output capability for Symo GEN24 Plus
Any active power demand imposed to the inverter from the loads will be met with energy coming from the
battery and PV, if available.
Any reactive power demand imposed to the inverter from the loads will be met without discharging the battery or
without using energy from PV, if available.
4.4.1 System Capacity Limitations - Examples
To better explain the continuous capacity constraints of the whole system comprised of batteries and inverter,
two examples with different load configurations are shown below.
Example 1: Symo GEN24 8.0 Plus + BYD HVM 11
Max battery discharge 4.5 kW,
Max inverter capacity (total): 8 kVA,
Max inverter capacity (per phase): 3.68 kVA.
Table 4.4.1.a: Example 1 System and loads capacity considerations
Example 2: Symo GEN24 10 Plus + BYD HVS 10.2
Max battery discharge: 9 kW,
Max inverter capacity (total) 10 kVA,
Max inverter capacity (per phase): 3.68 kVA.
Table 4.4.1.b: Example 1 System and loads capacity considerations
The key takeaway is to understand the capacity limitations of the whole system comprised of a battery and an
inverter.
As PV might be present during the backup operation, it will top up the battery capacity if available and if
needed. However, as PV by nature is not a reliable energy source this can’t be guaranteed.
Note 1: Battery size/capacity may limit this further, refer to table 4.2.b
(c) Fronius Australia Pty. Ltd, 2021 5/16
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