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Old 23rd September 2009   #1
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Calculate UPs Backup TIme and how to connect UPS


Hi,
I am curious to know how to calculate UPS backup time?
1) Suppose I have 7.5KVA with a set of 12 V 100AH 14 SMF Batteries. what will be the backup of this UPS? Is there a formula to calculate this?
2) Suppose I have 7.5KVA and I want to connect 20 computers and they should have battery backup for atleast 20 min then how many batteries and how much rating should be added?

I tried to search on net but could not find any particular good solution?
Pls help.

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Old 23rd September 2009   #2
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My System
APC has a web site UPS Selector Sizing Applications that should get you started.

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