iGuest 3 Report post Posted September 6, 2012 how can i calculate battery backup time of ups? what is the formula for battery back up time calculation? Share this post Link to post Share on other sites
yordan 10 Report post Posted September 6, 2012 Of course, the best way is asking the ups provider the question "how long can it rescue a laptop?"The other way is calculating an approximated value.The UPS has a battery, which content is expressed in terms of AH (for instance 50 AH means 50 ampers/hour).Then you look at the power supply entry of your laptop or your PC, how much ampers it's stated using.For instance, mine is 220Volts 1 Amper.This means 220 VA (220 volts time 1 amper).The 50 AH battery will be able to sustain it during (50/220=0.27 hour) which means 13 minutes.Of course, there is some loss, so probably a 50AH UPS will be able to sustain your 220 watts PC during about 6 minutes.Hope this helpedRegardsYordan Share this post Link to post Share on other sites
manuleka 0 Report post Posted November 7, 2012 Backup Value provided by UPS manufacturers are an estimate as well so one can't be too sure, but if you go for a well known and reliable brand then this approximation can be much more accurate and of-course better reliable Share this post Link to post Share on other sites
