APPLICATION GUIDE
SETTING UP FULL BATTERY BACKUP
WITH FRONIUS PRIMO GEN24 PLUS
THIS DOCUMENT AIMS TO PROVIDE EASY-TO-FOLLOW INSTRUCTIONS ON HOW TO BEST DEPLOY
THE BATTERY BACKUP FUNCTION OF FRONIUS PRIMO GEN24 PLUS INVERTER SYSTEM
Application Guide
© Fronius Australia Pty Ltd.
Version 3.0/2021
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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
16/11/20
2.0
Minor wording changes
Fronius Australia
11/11/20
1.0
Initial release
Fronius Australia
1. CHANGE LOG
2. GENERAL
Fronius Primo GEN24 Plus offer the opportunity to supply select electrical loads 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-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.
Additionally, for successful integration please make sure following items are ticked:
Inverter is Fronius Primo GEN24 3.0/3.6/4.0/4.6/5.0/6.0 Plus,
Suitable battery installed,
Inverter+Battery capacity suitable for the backup loads connected,
Fronius Smart Meter correctly installed (feed-in point),
Correct Hardware applied,
Correct Software Settings applied,
Warning notice - Backup Power Supply installed, see appendix A,
Backup power checklist 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: Primo 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
visit BYD’s online documentation available here.
Table 4.2.a: BYD Battery-Box HVS/HVM Premium specifications
Table 4.2.b: Charging/discharging power capability of Fronius Primo GEN24 Plus inverters and BYD HVM/HVS
It is possible to combine multiple BYD batteries to increase energy storage capacity, with key information show
below. Compatibility confirmation is available here.
Table 4.2.c: Energy capacity of 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 Primo GEN24 Plus information
Fronius Primo GEN24 Plus inverter is available in few power classes 3-6 kVA with full backup functionality
available to all. Inverter’s technical details are shown below.
Table 4.3.a: Primo GEN24 Plus technical details
(c) Fronius Australia Pty. Ltd, 2021 4/16
Power Class
3.0
3.6
4.0
4.6
5.0
6.0
Continuous [VA]
3000
3600
4000
4600
5000
6000
Continuous [A] @ 230Vac
13
15.6
17.3
20
21.7
26
Overload (5sec) [VA]
6200 (27.9A @ 230Vac)
Load
Comment
Example 1
3 kW / 3 kVA
Ok
Example 2
4 kW / 6 kVA
Ok
Example 3
5 kW / 5 kVA
Battery capacity surpassed
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 Primo 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,
an example with different load configurations is shown below.
Example 1: Primo GEN24 6.0 Plus + BYD HVM 11
Max battery discharge: 4.5 kW,
Max inverter capacity (total): 6 kVA.
Table 4.4.1.a: 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 4.2.2.b
(c) Fronius Australia Pty. Ltd, 2021 5/16
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