Use this free calculator to plan ups runtime from its battery bank and actual load. Change the load, starting surge, losses and battery limits to match your equipment.
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Every input includes a simple explanation.
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Motors and compressors can need extra power when they start.
Battery age, temperature and a high discharge rate can reduce delivered energy.
Use this as a planning range. Confirm continuous rating, peak rating and battery compatibility with the manufacturer and a qualified installer.
The estimate applies usable discharge and UPS efficiency to the internal battery bank before dividing by connected watts.
Use actual load and the UPS maker's discharge curve because small sealed batteries lose effective capacity at high rates.
The VA printed on a UPS is not battery energy and cannot by itself predict minutes of runtime.
Runtime = battery nominal Wh × usable fraction × UPS efficiency ÷ load
Use actual load and the UPS maker's discharge curve because small sealed batteries lose effective capacity at high rates.
The VA printed on a UPS is not battery energy and cannot by itself predict minutes of runtime.
Use this as a planning range. Confirm continuous rating, peak rating and battery compatibility with the manufacturer and a qualified installer.