Anyone want a UPS?

From: <(>
Date: Sun Dec 15 06:29:00 2002

On Dec 14, 10:50, Sellam Ismail wrote:
> On Sat, 14 Dec 2002 wrote:
> > I've decided that the "big" UPS which has been sitting in my workshop,
> > unused, for almost a year, really is surplus to requirements, so it's
> > to anyone *who can collect it* and feels like replacing the batteries.

> I also have a huge UPS. It's a Sola 5KVa unit. It has sat dormant in my
> data closet for years now. I never got around to buying new batteries
> it (too expensive and I don't know if the Sola unit itself has problems
> it was arcing at one point).
> Is it worth rehabilitating or should I finally just junk it? The bitch
> heavy (over 100lbs).

Any reasonable UPS will be heavy, because big batteries are heavy :-)
 Whether it's worth doing anything with it depends on whether you need a
high-current or long-duration UPS. That one would allow you to boil the
kettle for a cup of tea (or run the coffeemaker) during those power outages
when there's nothing else you can do :-)

It's not that hard to come by second-hand UPSs, the usual fault being that
the batteries have gone bad (sulphated), and that's usually because people
don't cycle them properly. There's some evidence to suggest that --
providing they've not gone too far -- high current high-frequency pulses
can rejuvenate lead-acid batteries, and there are some circuits around
designed to provide the remedy. I built one, and it seems to work, so long
as the cells have *some* life left. Measure the voltage on each cell. If
it's below 1V, or the cell looks at all swollen or distorted, it's past

Pete						Peter Turnbull
						Network Manager
						University of York
Received on Sun Dec 15 2002 - 06:29:00 GMT

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