UPS Battery Energy & Runtime Estimator
Estimate an energy-balance runtime from usable battery energy and conversion efficiency.
UPS Battery Energy & Runtime Estimator
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Formula
Worked example
100 kWh, 80% usable energy and 94% efficiency supplying 100 kW gives 45.12 minutes in this simplified model.
What this calculation does not cover
An energy estimate, not a manufacturer discharge curve. It excludes discharge-rate effects, temperature, aging, inverter power limits and minimum DC voltage. Check actual runtime curves for procurement or safety decisions.
Using the result responsibly
Keep a record of the input units and operating assumptions. A change in one input can make two apparently similar equipment options impossible to compare. Export the scenario before reviewing it with your engineer or equipment manufacturer.