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Gerry[_3_] · February 16th 08, 07:37 PM posted to rec.radio.amateur.homebrew

Jimmie D wrote:
"Clever Monkey" wrote in message
...
wrote:
I was thinking about using a UPS as a power supply for an amplifier.
The UPS is rated at over 2KW and uses 48 volts on the DC bus. I have
tried powering an amp directly from the batteries and it seems to work
OK. Battery pack is rate at 20 amp/hr. The inverter side of the UPS is
dead but the charger side is still functional. The plan is to remove
the inverter circuit completely. Can anyone think of anything wrong
with doing this.

Bear in mind that even with light use, the batteries will eventually have
to be replaced. APC, for example, rates their SOHO UPS devices with
replaceable batteries at 2-3 years between change-ups.

However, this is an excellent way of maintaining a decent shack when the
lights go out.

I have some 100 amp/hr batteries, I was wondering if they might work with
the UPS charger.

Jimmie

I use a small APC UPS in the outdoor shack with a 110Ah camping battery,
the small charger works OK but does take a few days to recharge. I added
a small fan to the heat sink of the inverter as it tends to get a bit
hot. The chargers need a battery connected as a load as they are not
pure DC.

Gerry....