apc smart 1500 Runtime issue

[Anonymous user]

hi 

i have a smart 1500 ups  ( SUA1500I ) And ups load is 19.4 % When the electricity goes off the runtime remaining shows in powerchute is 131 min   but after a few seconds the runtime becomes 70 min and continue to fall 

and i've switched the battery month ago and still the same problem 

[BillP · Accepted solution]

You may want to try a runtime calibration to adjust this. The runtime remaining is supposed to be a "really good estimate." If there have been no full or deep discharges (or a calibration), the value may not be accurate.

You can issue the runtime calibration command via PowerChute and it will discharge the UPS down to 10-20% charge and let it charge back up. And don't worry, your attached equipment will know not to turn off. Alternatively, you can attempt a manual calibration which would require the following stepsoutlined in this article -> http://www.apc.com/support/index?page=content&country=ITB〈=en&locale=en_US&id=FA156538 (Note: The article covers manual runtime calibration but the topic of the article is slightly different than what you're seeing.)