One of the early UPS manufacturers (Cuesta Systems) was here in San Luis
Obispo. They included connectors on the rear panel for an external
battery. I think they had to remove these when shipping to Canada because
of safety concerns. The temperature rise of the unit was limited by the
capacity of the internal battery (the battery would go dead before the
unit got too hot). With an unknown sized external battery overheating was
possible.

Other than this concern, I can't think of a reason to not use an external
battery. Testing or the addition of an overtemp thermostat might be
appropriate.

Harold


> Can anyone think of a reason not to attach a car battery in place of the
> sealed battery in a battery backup system?  I've got a few of these
> carcasses laying about because it's always been cheaper to buy a new one,
> but a cheap car battery could breathe new life into them.  Clearly, I
> don't
> want to turn it over and spill acid, but think of the backup time
> available!
>
> Thanks,
> Ed
>
> --
> http://www.piclist.com hint: To leave the PICList
> mailto:piclist-unsubscribe-request@mitvma.mit.edu
>


--
FCC Rules Online at http://www.hallikainen.com

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu