[3558] in RedHat Linux List
Re: UPS reccomendations
daemon@ATHENA.MIT.EDU (James ORR 77.23)
Sat Nov 9 05:13:23 1996
Date: Sat, 9 Nov 1996 11:11:32 +0100
From: "James ORR 77.23" <orr@obelix.saclay.cea.fr>
To: redhat-list@redhat.com
Reply-To: orr@cea.fr
Resent-From: redhat-list@redhat.com
>> Is it possible to wire car batteries to a UPS in parallel
>> to increase runtime? Somewhere I once heard that
>> it was possible. I have a BACK-UPS 900 and I'd like
>> to add some muscle to it.
> You need special 12V batteries with liquid gel electrolite
> like the ones used on sailboats and marine industry
> rather than standard liquid acid car batteries. The gel
> ones are more expensive but they can be totally drained
> and recharged, they are more durable that car batteries,
> they do not leak fumes, do not require refills, work in any
> position and can tolerate much more abuse. When I lived on
> a sailboat, I used a 12 v --> 110/220 v marine inverter and one
> 12 v battery was enough for 3 hours of computing or 2 hours
> of watching tv until the battery was drained below acceptable
> level.
I believe you are referring to "deep-cycle" batteries which are
expressly designed to be discharged completely, then recharged.
As you mentioned car batteries are different, being made to be
continually charged. They would not last very long nor would
they provide as much power if you used them as you would a
deep-cycle battery.
Golf carts are also driven on deep-cycle batteries. When I
built some instrumentation years ago that used 3 x 12V deep-cycle
batteries, I recall thinking that their prices weren't really
more expensive than those for good automobile batteries.
Good luck, Jim
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