UPS Runtime Calculator

Estimate how long your batteries will carry a site given the load, battery capacity, and voltage, including a realistic runtime at 80% depth of discharge to protect battery life.

What this tool does

When the power fails, your batteries keep a site running for a while. This tool estimates how long, from the equipment load and your battery bank, and gives a realistic figure that also protects the batteries from being drained too far.

Your site

Choosing one fills in the load below; you can still change it
The total draw of everything on the UPS
Printed on the battery, for example 100 Ah
Batteries wired side by side to add capacity
Real batteries deliver less than their rating once inverter losses are counted. 0.85 is a safe figure for lead-acid; leave it unless you have a better number.

Need a site reliability review?

NOC Enablement and Monitoring covers power resilience, site monitoring, and the alerting that tells you when a site is running on battery before it goes dark.

NOC Enablement