[rescue] adding power redundancy to single power supply systems ?

Lionel Peterson lionel4287 at verizon.net
Mon Mar 24 18:48:17 CDT 2008

>From: Patrick Finnegan <pat at computer-refuge.org>
>Date: 2008/03/24 Mon AM 10:33:18 CDT
>To: The Rescue List <rescue at sunhelp.org>
>Subject: Re: [rescue] adding power redundancy to single power supply systems ?

>On Mon, Mar 24, 2008 at 11:31:10AM -0400, rescue at hawkmountain.net wrote:
>> Did some searching... does anyone make a 'power strip' that takes two AC
>> feeds, has some relays/capacitor magic/etc and can flop between a primary
>> AC feed and a secondary AC feed to make single power supply systems take
>> advantage of multiple colocation power feeds ?
>> I never 'strike out' with this group...  hopefully this won't be the first
>> time for it :-)
>Yep, APC does, and they cost about $500 new.
>I'm sure you could build one using just a single relay (with a 120V
>coil) and the cut off ends from some power cords for about $10, maybe
>$20 if you want a nice enclosure to put it in. :)

How do you keep the equipment from failing when it switches from one output to the other?

It would be quick, but would it be quick enough? If you put a UPS between the switch and the system it would work great...


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