LiFePO4 battery sizing for solar storage and backup

A LiFePO4 battery’s kWh describes its energy; the inverter’s kW describes the load it can supply at one time. A 12.8 V, 100 Ah battery stores 1.28 kWh nominally, before conversion losses or operating reserves.

Small DC loads, household backup and commercial storage call for different battery and inverter combinations. A useful project brief includes daily Wh, the biggest simultaneous load, backup hours and the inverter’s exact model.