RESERVA BATTERY MODULE 3.15 kWh AUS-NZRESERVA BATTERY MODULE 3. 15 kWh AUS NZ Ultra flat and powerful that's the Fronius Reserva high voltage storage system. Thanks to its high cell voltage, it can be used with high charging power on GEN24 hybrid devices with as few as 2 storage modules. In the proven stacked design, just under 15. 8 kWh of usable capacity can be realised with 5 elements. For larger storage requirements, up to 4 systems can be connected in parallel. And with an