Calculator
How long a battery runs a load
Estimate how long a battery can run a given load, based on usable capacity for the chemistry and typical inverter losses.
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Usable capacity after depth-of-discharge
Daily watt-hours for a device
How many days your battery bank lasts
Estimates for planning only. Verify with a meter and follow NEC / local code; have a licensed installer confirm any system before purchase or wiring. See the methodology for formulas and sources.