Battery Runtime Calculator

Estimate how long a power station can run a steady AC load.

Battery capacity (Wh)

Appliance load (W)

AC conversion efficiency (%)

Reserve left unused (%)

Estimated runtime7.8 hoursSteady-load estimate; cycling loads and inverter behavior can change real-world runtime.

Formula

Runtime ≈ battery Wh × efficiency × usable fraction ÷ load watts. A 1,024Wh battery at 85% AC efficiency with 10% reserve provides about 783Wh of modeled usable AC energy.

Why real runtime differs

Refrigerators, pumps and air conditioners cycle on and off, startup surges can be much higher than running watts, and inverter efficiency changes with load. Use this as a planning estimate, not a guarantee.