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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    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
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    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
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    voltage of each battery is 12V.
     
  4. t_n_k

    AAC Fanatic!

    Mar 6, 2009
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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
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    Thank you Zapper i agree with you
     
  8. sumitk

    Thread Starter New Member

    Aug 1, 2012
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    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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