Any time you have cells or batts in parallel and one of the cells shorts,
the whole system drops 2 volts. (if lead acid chemistry).
-----Original Message-----
From: Matt Hoppes
Sent: Friday, June 29, 2018 6:45 PM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] Fun with a solar site
Robert, that was my first thought as well but why would connecting
additional batteries suddenly drop the overall voltage? Do you think that is
just the cells can’t put out enough to charge everything so the overall
output voltage goes down?
On Jun 29, 2018, at 20:38, Robert <i...@avantwireless.com> wrote:
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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