what kind of UPS will work best?
Gary Kline
kline at tao.thought.org
Mon Oct 8 10:10:52 PDT 2007
On Mon, Oct 08, 2007 at 02:36:05AM +0200, Pieter de Goeje wrote:
> 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.
>
Thanks a lot. I was thinking of doing something like this;
maybe an ammeter to see how much power each server draws; then
(possiibly add a bit for reserve).
I'm looking at this as a long-time project. Not rushing to do
something completely foolish. So the more accuracy, the better!
gary
> Cheers,
> Pieter de Goeje
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--
Gary Kline kline at thought.org www.thought.org Public Service Unix
http://jottings.thought.org http://transfinite.thought.org
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