On 8/18/20 1:20 AM, Tim Dawson wrote:
My experience on situations like this is that it is almost always a
bad battery. Once load is removed, the voltage bounced back, and thus
you show time/capacity, but it's possible that the sag under load
drops you into LB, and causes the shutdown.
If the UPS has a battery test, give it a try, or load test the battery
external to the UPS if you can - I suspect that the UPS will be fine,
and the battery degraded.
- Tim
My thoughts exactly. I suggest to take the battery out after fully
charging it and discharge it using a load like an incandescent bulb for
a car headlight or a 12V motor ( like a fan ). I preserved a bulb
suitable for my old car especially for that: with both short and long
range filaments connected in parallel it draws somewhere around
80-90W/12V. You could use a voltage meter to monitor the (dis)charging
status , although the intensity of the light will be a very good indicator.
In any case, do not let the voltage drop below 10V in order to avoid
damaging the battery ( assuming it is not dead already ). My bet is that
one of the elements is defective and under load it gets short-circuited,
thus leading the global voltage to drop fast with cca 2...2.2V below its
standard 12...14.2V.
wolfy
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