Electrical & Power

Battery Capacity Calculator

Estimate required battery amp-hours for a desired load and runtime.

Load power (W)

Required runtime (hours)

Battery voltage (V)

System efficiency (%)

Usable depth of discharge (%)

Results

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Required energy—

How this calculator works

Required amp-hours account for load energy, voltage, efficiency and the usable portion of battery capacity.

Safety note: Electrical calculations are estimates. Follow local codes and manufacturer instructions, and use a qualified electrician for installation or safety-critical work.