View Single Post - Any way to work out how long a UPS will last?

martz · Rated R

If i have a UPS of a certain size, with a certain load placed upon it, is there any way to work out (roughly) how long i can expect that UPS to perform for before the battery depletes ?

Manufacturers give values, but like fuel economy, those figures are open to wild interpretation imo.

Any ideas ?

Edit: Here's what i'm looking at to provide backup power to a hybrid pstn/voip phone system (draw load as yet unknown) :

http://www.apcc.com/resource/include/techspec_index.cfm?base_sku=SURT3000RMXLI