The inverter ecosystem should decide the shortlist
Fronius Reserva is a modular high-voltage LFP battery intended for compatible Fronius hybrid-inverter systems. SolarEdge Home Battery 48V (BAT-05K48) is a 48V-class LFP module designed for supported SolarEdge residential inverter architectures.
| Factor | Fronius Reserva | SolarEdge Home Battery 48V |
|---|---|---|
| Architecture | High-voltage modular tower | 48V-class modular battery |
| Published usable capacity | 6.31–15.79kWh per tower, depending on module count | About 4.6–4.85kWh usable per module depending on configuration/documentation |
| Expansion style | 2–5 modules per tower; supported parallel-tower rules apply | Multiple supported 48V modules; confirm inverter and regional limits |
| Key compatibility question | Is the exact Fronius inverter/firmware approved for the Reserva stack? | Is the exact SolarEdge inverter/firmware approved for BAT-05K48 and the desired module count? |
Do not compare capacity in isolation
Backup output is constrained by the complete system: battery discharge limits, inverter power, transfer equipment and the backed-up loads. Ask for the one-line diagram and compatibility documentation for the exact proposed configuration.
Use the low-voltage vs high-voltage battery guide and compatibility guide before comparing quotes.