how to calculate the backup

Discussion in 'General Electronics Chat' started by sumitk, Aug 1, 2012.

1. sumitk Thread Starter New Member

Aug 1, 2012
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0
how to calculete the backup of a online 2kva UPS connected with 6 batteries of 26ah each,if the load given is of 1kw ??

2. crutschow Expert

Mar 14, 2008
12,977
3,220
Not enough info. Need to know the efficiency of the UPS and the voltage of the batteries.

3. sumitk Thread Starter New Member

Aug 1, 2012
7
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voltage of each battery is 12V.

4. t_n_k AAC Fanatic!

Mar 6, 2009
5,448
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Total kWh=V*(total Amp-hours)/1000

5. sumitk Thread Starter New Member

Aug 1, 2012
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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

6. crutschow Expert

Mar 14, 2008
12,977
3,220
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.

7. sumitk Thread Starter New Member

Aug 1, 2012
7
0
Thank you Zapper i agree with you

8. sumitk Thread Starter New Member

Aug 1, 2012
7
0
but if the ups rating is 3kva insteed of 2kva ,with same number of batteries and same specification then what should be the backup.