Battery Sizing

Estimate required battery capacity (Ah) from voltage, load, runtime, and efficiency.

Best for: sizing a simple DC battery requirement when you know your load and runtime target but need to account for conversion losses.

System Voltage (V) Load Watts (W) Load Amps (A) Runtime (hours) Efficiency (%)

Results

Enter values and press Calculate.

Notes / Assumptions

If you enter Watts, amps are derived as: Amps = Watts ÷ Volts
If you enter Amps, watts are derived as: Watts = Volts × Amps
Efficiency accounts for inverter / driver losses and battery discharge inefficiency.