How this ups runtime calculator works
Battery watt-hours are adjusted for usable capacity and divided by connected watts.
How to use it
- Usable battery rating. Enter the value in Wh.
- Usable capacity. Enter the value in %.
- Connected load. Enter the value in W.
- Request the result. Add your email, then select “Email & show my result.”
What to do with the number
UPS batteries can deliver less than nominal energy at high discharge rates, especially as batteries age. For critical equipment, compare the estimate with the manufacturer runtime curve at your actual load.
Planning estimate
Use this result as a starting point, not a guarantee. Product specifications, site conditions, manufacturer guidance, local codes, taxes, labor, tolerances, and rounding can change the real requirement or cost.