Electrical / Battery systems

Battery Runtime Calculator

Estimate usable energy and theoretical runtime for a battery and steady electrical load.

Battery

Battery voltageCapacityCapacity unitUsable depth of dischargeSystem efficiencyReserveEnergy deliberately kept in reserve.

Load

LoadLoad unit

Estimated runtime

Usable runtime8 h 38 min

8.64 hours at the stated load.

Nominal battery energy: 1,200 Wh
Usable battery energy: 864 Wh
Load power: 100 W
Estimated runtime: 8.64 h

Runtime is theoretical. Battery chemistry, temperature, age, discharge rate, voltage sag, inverter losses and BMS limits can materially change real runtime.