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Old 05-07-2012, 02:39 AM
smilers smilers is offline
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Join Date: Jul 2009
Posts: 10
Default Power calculation for server racks

Hi Folks,

Need some light on power calculation in Data Centre.

Server rack has 2 power source A & B.

3 KW power is catered to this rack.

And assuming readings at Rack show 3 KW for both powerstrips.

Does is mean this rack can use 3 kw from A source and 3 KW from B source? If so, then this rack is using 6 KW?

If i conclude rack is drawing only 3KW although it has source A & B. Then, incoming power at DB or UPS would show 3 KW for each UPS.
ie. UPS A = 3 KW
UPS B = 3 KW

Both UPS = 6 KW

Please enlighten. Thanks.
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Old 06-03-2012, 05:06 AM
Neoeclectic Neoeclectic is offline
Join Date: Oct 2008
Posts: 85

The standard rules are 50% and 80%.

50% if you want absolute redundancy. 80% is the maximum allowed load according to USA electrical code standards. I'm not sure what the codes are for other countries. But never should it be 100%. If you have 6kW total to a cabinet 2.4 kW per power strip is what you should be aiming for in actual usage.
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