hosed cell(s)
On 6/29/18 5:12 PM, Matt Hoppes wrote:
I’m currently about halfway through troubleshooting a solar site and had to
quit for the day.
I have a site with five 100 amp hour batteries. It is a 12 V site and I have
three of the batteries on to wire leads going to the charge controller and two
of the batteries on a wire lead going to the charge controller.
I have been seeing something weird for the past three months where during the
day on a sunny day we never hit and plateau at about 12.5 12.7 V like we used
to.
Instead it will get up to about 12.2 or 12.3 and then do this weird saw tooth
pattern. Today when I was at the site I disconnected the secondary battery
group of three batteries and things went up to 12.5 V and plateaued.
When I reconnected the three batteries it went down to 12.2 and started doing
the weird saw tooth pattern.
What do those of you who have worked with solar before think? Might this
indicate a bad cell or battery? Or some kind of an issue with not enough
voltage or amps being pushed into the battery strings? Or something else?
I should also mention that normally this site is able to maintain itself, but
in its current state it maintains a very steady decay until the batteries are
finally drained and I’ve had to boost it once with a charger.
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