Answer Posted / basanta das

Ups Standard Bacup Time = (Battery Volt X Each Battery Ah X No. Of Batteries) / load in VA
For example: Volt 12 x AH 26 x Total batteries 16 = 4992
Now divide the above with required load (1 KVA) =1000VA
So result is 4992/1000 = 4.992 hours
Means your UPS will run for 4.992 hours in standard calculation method, but in actual there will be a UPS energy waste or dissipation, let your UPS efficiency is 80% then you will get actual time
4.992 x 0.80 = 3.9936 hours i.e approx. 4 hours of backup time for 1KVA load if you have 12volt, 26AH battery of 16 nos.

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