UPS Battery Backup Time Calculator

Quick Answer

Calculate how long your UPS battery can power your connected appliances.

UPS Battery Backup

UPS Capacity (VA)

Connected Load (Watts)

Battery (Ah)

How This Calculator Works

Calculate how long your UPS battery can power your connected appliances. Uses 80% depth of discharge for battery health.

Estimates only. Results are approximate based on standard formulas and current rates. Actual amounts may vary. Use for planning — verify with official sources for exact figures.

UPS Backup Calculator — Runtime Guide

How long will a 1000VA UPS run 3 fans and 4 lights?

3 fans (~225W) + 4 LED lights (~40W) = ~265W load. With a 150Ah battery: approximately 5-6 hours of backup.