Date: Mon, 8 Oct 2007 10:04:00 -0700 From: Gary Kline <kline@tao.thought.org> To: Pieter de Goeje <pieter@degoeje.nl> Cc: Gary Kline <kline@tao.thought.org>, freebsd-questions@freebsd.org, Erich Dollansky <oceanare@pacific.net.sg> Subject: Re: what kind of UPS will work best? Message-ID: <20071008170400.GB84240@thought.org> In-Reply-To: <200710080236.05888.pieter@degoeje.nl> References: <20071006231203.GA65801@thought.org> <47084E80.3010003@pacific.net.sg> <20071007194446.GA69551@thought.org> <200710080236.05888.pieter@degoeje.nl>
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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 > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" -- Gary Kline kline@thought.org www.thought.org Public Service Unix http://jottings.thought.org http://transfinite.thought.org
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