Battery calculators

Charging time, runtime, unit conversions and wiring — with the formula, the assumptions and the sources behind every result. Works offline.

Charge time

How long charging takes for a given charger current and state of charge.

How long a battery will carry a given load.
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Convert between Ah, Wh and kWh at a known system voltage.
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Bank voltage and capacity for series and parallel wiring.
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Voltage drop along a cable and the required conductor size.
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