Fronius Primo GEN24 Plus Application Guide - Setting Up Full Battery Backup
Description
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.
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.
4. TECHNICAL INFORMATION
4.1 Battery compatibility
Compatible batteries are listed below.
Table 4.1.a: Primo GEN24 Plus compatible BYD batteries
| Primo GEN24 Plus | BYD Battery-Box Premium HVS / HVM |
| ✅ | HVS 5.1 |
| ✅ | HVS 7.7 |
| ✅ | HVM 11.0 |
| ✅ | HVM 13.8 |
| ✅ | HVM 16.6 |
| ✅ | HVM 19.3 |
4.2 BYD Battery-Box Premium information
Key relevant specifications of the BYD Battery-Box Premium batteries are shown below.
Table 4.2.a: BYD Battery-Box HVS/HVM Premium specifications
| BYD BATTERY-BOX PREMIUM* | HVS 5.1 | HVS 7.7 | HVM 11.0 | HVM 13.8 | HVM 16.6 | HVM 19.3 |
| Usable capacity of the battery [kWh] | 5.1 | 7.7 | 11.0 | 13.8 | 16.6 | 19.3 |
| Nominal voltage of the battery [V] | 204 | 307 | 204 | 256 | 307 | 358 |
| Battery operating voltage [V] | 160 - 240 | 240 - 360 | 160 - 240 | 200 - 300 | 240 - 360 | 280 - 420 |
| Max. charge/discharge current Primo/Symo GEN24 Plus [A] | 22 | |||||
| Max. charge/discharge current Symo Hybrid [A] | 16 | |||||
* Values according to BYD.
Table 4.2.b: Charging/discharging power capability of Fronius Primo GEN24 Plus inverters and BYD HVM/HVS
| Maximum charging and discharging power with GEN24 Plus [kW] | HVS 5.1 | HVS 7.7 | HVM 11.0 | HVM 13.8 | HVM 16.6 | HVM 19.3 |
| Primo GEN24 3.0 Plus | 3.2 | 3.2 | 3.2 | 3.2 | 3.2 | 3.2 |
| Primo GEN24 3.6 Plus | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 |
| Primo GEN24 4.0 Plus | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 |
| Primo GEN24 4.6 Plus | 4.5 | 4.9 | 4.5 | 4.9 | 4.9 | 4.9 |
| Primo GEN24 5.0 Plus | 4.5 | 5.3 | 4.5 | 5.3 | 5.3 | 5.3 |
| Primo GEN24 6.0 Plus | 4.5 | 6.3 | 4.5 | 5.6 | 6.3 | 6.3 |
It is possible to combine multiple BYD batteries to increase energy storage capacity, with key information show below:
Table 4.2.c: Energy capacity of paralleled BYD HVM/HVS batteries.
BYD BATTERY-BOX PREMIUM | ||||||
2x / 3x HVS 5.1 | 2x / 3x HVS 7.7 | 2x / 3x HVM 11.0 | 2x / 3x HVM 13.8 | 2x / 3x HVM 16.6 | 2x / 3x HVM 19.3 | |
| Capacity [kWh] | 10.24 / 15.36 | 15.36 / 23.04 | 22.08 / 33.12 | 27.60 / 41.40 | 33.12 / 49.68 | 38.64 / 57.96 |
| Primo GEN24 Plus | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
