In a message on Wednesday 12-08-15 mark lewis said to Holger Granholm:

Good morning Mark,

 HG> In my case, I think that the batteries I use are actually intended for
 HG> scooters, motor cycles, small mowing/garden machines and such, as
 HG> starter batteries, but since their life span is 7 - 8 years in my UPS,
 HG> they'll do

ml> i'll have to check that out... i've been using the standard gell
ml> filled ones with the same ratings as the originals...

That's the type I use as well, ie. gel cell batteries.

ml> at one time i did string some batteries together... worked great but
ml> the charging circuit took forever to recharge them...

Of course, because the charging circuit was intended to refresh only
the original A/h capacity.

ml> i also had to use a good heavy duty wire between them...

You always have to consider that the current drawn at 12V is tenfold the
current drawn from the (115V) AC mains, and therefore the wire has to be
thick enough to carry that current, and not to drop the voltage.

ml> the first i used was from a heavy duty extension cord... the initial
ml> test worked but melted the insulation off the wires...

My entire ham radio station is powered from a 12V battery with backup
from a 20A constant voltage power supply. The 20A rating is there to
handle the peak currents, when running the transceiver at full power.

In this way, I don't have to buy separate mains power supplies to every
set, and emergency power is constantly available.

I also own a 500 Watt PA that was only powered from the mains but the
tubes have gone soft, so it's now resting in a cupboard. I'm afraid to
order the tubes because the weight of the graphite anodes may destroy
them in transit.

ml> ...Beauty is in the eye of the beer holder....

Nice translation of the original .

Seasons Greetings,

Holger

___
 * MR/2 2.30 * Consistency isn't always good especially if you're consistently wrong


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