I'm wondering if anyone has taken a look at using a standard UPS - as an
example, I have an APC Back-UPS 420 - and just run wires out to a much
larger battery. I wouldn't think this would cause a problem for the UPS
when _using_ the battery, it just runs longer than is otherwise possible,
with no extra capacity. The only problem I see is the charging circuit,
it might not like having to charge a much larger battery. In that case,
I had thought about isolating the battery from the UPS (say, with a heavy
diode of some sort), keeping it charged thru other means. Of course I
then wind up with basically buying an inverter and a relay that drops out
when the power goes away.
I haven't tried this yet, but do intend to one of these days. Has anyone
else thought about or tried it? The main reason I haven't done anything
yet is that blasted warranty they give me...! :-)
Enjoying the conversation!
Joe Martine, N5USR
yxdvv.vyghgyjms@coffeynet.com