Battery Backup Time

Estimate how long a battery bank will last under a given load.

Battery Capacity (Ah)

Battery Voltage (V)

Load Power (Watts)

Efficiency / Depth of Discharge (%)

Estimated Backup Time

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Formula

Backup Time (hours) = (Ah × Voltage × Efficiency/100) / Load (Watts)

Useful for estimating GMDSS, emergency lighting or UPS battery runtime on board.