Date: Mon, 8 Oct 2007 02:36:05 +0200 From: Pieter de Goeje <pieter@degoeje.nl> To: freebsd-questions@freebsd.org Cc: Gary Kline <kline@tao.thought.org>, Erich Dollansky <oceanare@pacific.net.sg> Subject: Re: what kind of UPS will work best? Message-ID: <200710080236.05888.pieter@degoeje.nl> In-Reply-To: <20071007194446.GA69551@thought.org> References: <20071006231203.GA65801@thought.org> <47084E80.3010003@pacific.net.sg> <20071007194446.GA69551@thought.org>
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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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