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UPS Backup Time Calculator

UPS Backup Time CalculatorMinutes from VA, load, battery Ah. Fast, free and secure — works in your browser. By AK Computer, Dwarka.

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How to use

  1. 1 Enter the UPS rating in VA and its power factor.
  2. 2 Add the total connected load in watts.
  3. 3 Enter the battery voltage and capacity in Ah.
  4. 4 Read the estimated backup time in minutes.

Frequently Asked Questions

How is UPS backup time calculated?

Backup minutes are roughly battery voltage multiplied by Ah multiplied by 60, divided by the load in watts, then reduced by inverter efficiency of around 80%. Higher load means shorter runtime.

How long will a 600VA UPS run a desktop?

A typical 600VA UPS with a 7Ah battery backs up a 150W desktop for about 5 to 10 minutes, which is enough time to save your work and shut down safely, not for long usage.

Can I increase my UPS backup time?

Yes, by connecting a larger external battery or reducing the load. Switching to an efficient LED monitor and an SSD-based PC also lowers wattage and stretches the available backup.