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Old 03-08-2012, 06:44 PM   #1
delta32
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Default Help me picking an ups

i need a ups for my server that needs about 400w power.

Will i be fine with 600VA ups ?
or should i go with 850VA ?

I don't need long battery backup. Since the server will be shut down when power outtage occur.

Also, do i need to worry about active PFC PSU doesn't play nicely with non true sinewave UPS ?
I live in a 240V country.

Thanks.
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Old 03-09-2012, 12:39 AM   #2
Olle P
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Does it really need 400W power? Either it's very high end or the PSU is inefficient...

Active PFC says the reactive power is virtually same as effective power, so you should be fine with any rating above 400VA.

You won't need true sine, but you should opt for an UPS that doesn't use stepped square, where the voltage linger at 0V twice per cycle. It's that zero state that cause problems with some PSUs (reading it as "input voltage failure, turn off").
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Old 04-11-2012, 10:51 AM   #3
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The system require 400W or the whole cpu draw 400W from power outlet ?

60% efficiency of UPS is a safe bet. So if it currently draws 400W (the latter case) then you woud need 100/60*400=666.66 VA ups. The manufacturer may say 70% efficiency but it usually means "up to 70%" on ideal load condition and input voltage.
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