UPS Rating Calculation

1 reply [Last post]
anujkrsingh13's picture
Joined: 2016-03-30

Hi all,

If I know specifications of a cell in a battery bank and the connections then how can I calculate the total KVA of a UPS system?

Please clarify with an examples.


Miguel Estrada's picture
Joined: 2014-08-20

You can not calculate the total kVA capacity of the UPS. Battery specifications and quantity depend on the nominal DC voltage of the battery bank for a specific type and brand of UPS, and also depends on how much backup time will you expect from this bank.

You could have a 50kVA UPS or a 80kVA UPS with the same quantity of batteries and the same capacity in A-H. This will only mean that backup time will be longer for the 50kVA UPS.

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