To calibrate :-

Using software on PC if you have it put a 33% load on the ups,
or as close as you can get.

Turn everything off then disconnect the serial comms lead to the pc
and also disconnect the mains into the UPS.

Turn on the ups with the load and run the batteries down until the
UPS switches off.

Re-connect the ups mains and charge the batteries then remove
mains and discharge again, and again recharge, that should recalibrate
the new batteries.




"Isi" wrote in message
...
The APC Smart UPS 600VA (AP600) had dead batteries, and I replaced them
with
new ones. After replacing the batteries, I tested the unit with a 100W
load
(light bulb), and it switches to battery mode properly with cut AC. Once
the
load is increased to 300W (halogen bulb again) it reports low battery,
even
when the AC power is present. The unit properly switches to battery power
on
AC loss, but low battery is still on. Once the load is decreased, the low
battery goes off instantly and it works normally. I checked the battery
voltage and I found 26V (2X13V) with 300W load (or no load) and AC power,
and 23.5V (2X11.75V) when operated on battery with cut AC and 300W load,
which seems OK. Is a recalibration required after replacing the batteries?
Thanks in advance.

Istvan
icsaki at hotmail dot com