RE: UPS batteries

["Steven Dickson" <sdickson@xxxxxxx>]

I've got an old one of these APC UPS units as well - I acquired it from my old employers as it was always in alarm mode for a battery fault.  At the time I rang APC who have a service centre in Galway I think, they wanted several hundred pounds to recon the unit.

 

Decided to have a look myself, went to local alarm suppliers - bought two batteries, carefully disconnected the innards and replaced the batteries, cleaned up the pcb etc, reassembled and haven't looked back since.

 

Only annoyance was the power cuts earlier in the year - Mark will remember, power failure alarm woke us up at some ungodly time of the morning - PC still happily churning away, getting ready to do a controlled shutdown.

 

Rgds, Steve

 

 

-----Original Message-----
From: James Hoye [mailto:james.hoye@xxxxxxx]
Sent: 15 May 2001 22:07
To: ukha_d
Subject: RE: [ukha_d] UPS batteries

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> I took the thing apart and really didn't fancy the idea of changing the
> batteries myself.  It's clearly not intended to be a user
> serviceable device
> and there's mains voltage in there somewhere.  However I did mail
> them about
> their 'Trade-UPS' deal and they offered me a very good discount (about 50%
> IIRC) on a new similar spec model.

It wasn't too bad to get them out.  There's a wacking great transformer in
them which must be 40% of the weight (the batteries being about 50%).

> Prompts me to another question/train of thought:-
>   Alarm panel batteries are 12v?
>   PC's run on 12v?
>   UPS run on 12v batteries but step up the voltage and the PC
> transforms it
> down?
>     (anybody see where I'm going yet?)
>   12v rechargeable battery on 12v side of PC transformer?
>
> feasible or not ....

Don't forget that computer PSUs also provide +5v, and possibly +3v...

I suppose the idea of a UPS is that it can power anything - monitor,
computer, hub, router....

James


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