how to calculate the backup

Thread Starter

sumitk

Joined Aug 1, 2012
7
how to calculete the backup of a online 2kva UPS connected with 6 batteries of 26ah each,if the load given is of 1kw ??
 

Thread Starter

sumitk

Joined Aug 1, 2012
7
according to your formula i m getting 56.16 minutes of backup,is it correct ??total ampere hour i have taken is 26ah * 6=156
 

crutschow

Joined Mar 14, 2008
23,361
Total kWh = (12 * 26 * 6) / 1000 = 1.8 kWh, thus you would get 1.8 hours of backup if the UPS was 100% efficient (which it is not) and you completely discharged the batteries (which you shouldn't do). Taking those factors into account I would estimate about 1 hour of backup.
 

Thread Starter

sumitk

Joined Aug 1, 2012
7
but if the ups rating is 3kva insteed of 2kva ,with same number of batteries and same specification then what should be the backup.
 
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