what kind of UPS will work best?
Pieter de Goeje
pieter at degoeje.nl
Mon Oct 8 01:18:48 PDT 2007
On Sunday 07 October 2007, Gary Kline wrote:
> First, thank to both you and Bart for your cmments. You were
> *right* about the price. Can I assume that a ballpark would be
> 400W for each server? (My wife is right: I've got to cut back to
> three computers:-) I've found one APC 2200VA with a 17minute
> uptime. 3 times 400W, yes?
I think this is overkill. Some time ago I was wondering the same thing and to
verify my guess on the overall power usage of my servers I bought a VA/Watts
meter (EUR. 39,-). Turns out average wattage is about 90watts per server idle
and max 130watts under load. On powerup they will use a max. of 180watts for
less than a second. The servers are simple dual cores with about 2 harddisks
each. (no screens or other devices attached) Also, the powerfactor was ~0,95
so that means that for every Watt of apparent power (VA) almost a Watt of
real power was used. Thus, for my servers I would need something like a
500Watt/600VA UPS.
So my advice is: don't guess but measure.
Cheers,
Pieter de Goeje
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