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Battery Backup Runtime Calculator

How long a portable power station, UPS or home battery will run your devices during a power outage.

Typical loads: refrigerator 150 W average, Wi-Fi router 10 W, CPAP 40–60 W, phone 10 W, LED lights 10 W each, laptop 60 W, sump pump 800 W.

How it is calculated

Usable energy (Wh) = capacity × usable depth of discharge × inverter efficiency. Runtime = usable energy ÷ (load − solar input). Real runtime drops in the cold and with high-surge devices.

Results are estimates for planning, not bills or professional advice. For generator hookups use a transfer switch installed by a licensed electrician.

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