I have an Emerson Accupower model 20. It is an european model so the
battery is 24v.
The charging circuit is rather clever, consisting of an extra winding in
the transistor fed with an optoisolator and triac. The switching
mosfet's internal diodes then work as rectifiers.
However, it's not charging properly. If I replace the batteries with a
capacitor, the voltage stabilizes around 19 volts, and the 24v battery
gets completely depleted then.

Should I really bother with repairing it at all or just hook up a
separate small float charger?

It sounds like you need the proper battery replacement. The charger in these
is fairly sophisticated and is able to sense the battery characteristics. We
are using a few of the 120 VAC versions of that UPS.

In any of the UPS's we have, we found that after 3 years, the batteries must
be replaced.

--

JANA
_____


"Jussi Peltola" wrote in message
...
I have an Emerson Accupower model 20. It is an european model so the
battery is 24v.
The charging circuit is rather clever, consisting of an extra winding in
the transistor fed with an optoisolator and triac. The switching
mosfet's internal diodes then work as rectifiers.
However, it's not charging properly. If I replace the batteries with a
capacitor, the voltage stabilizes around 19 volts, and the 24v battery
gets completely depleted then.

Should I really bother with repairing it at all or just hook up a
separate small float charger?