Battery runtime

Capacity × voltage → Wh; minus inverter efficiency and depth of discharge → real runtime for a load

Parameters

Capacity, Ah

Voltage, V

Load, W

Depth of discharge, %

Inverter efficiency, %

Runtime

Energy: 1 200 Вт·год · current: 25 А

2.9 год

Energy (nominal): 1 200 Вт·год
Usable energy: 864 Вт·год

LiFePO4 can discharge 80–90%, lead-acid AGM only ~50% without lifespan loss. Inverter efficiency is 85–92%. Peukert effect: at high current a lead battery delivers less than nominal.