Probably because none have had a chance to charge up to a higher
voltage.. You would have to put each battery on a charger separately...
On 6/29/18 7:25 PM, Matt Hoppes wrote:
I do you have a fuse on each battery which I found interesting and now I’m sort
of wondering if that isn’t the case they all share the same voltage I’ve even
had them disconnected since about noon today and none show drained more than
another one.
On Jun 29, 2018, at 21:54, Chuck McCown <[email protected]> wrote:
You can avoid this in the future if you have a fuse on each battery.
(This only works with parallel arrays, not series arrays).
When a cell shorts, that battery will have much higher current until all the
other batts discharge into it down to the new voltage. Just make the fuse
higher by a little bit than the max charging current.
-----Original Message----- From: Matt Hoppes
Sent: Friday, June 29, 2018 7:46 PM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] Fun with a solar site
OK that’s what I was wondering. thanks Chuck, a wealth of information as always.
On Jun 29, 2018, at 21:38, Chuck McCown <[email protected]> wrote:
Disconnect one terminal of the battery and measure the voltage. The battery
with the shorted cell will have a lower voltage.
Or, during charging, just put your hand on the batts. The shorted cell bat
will run warmer.
-----Original Message----- From: Matt Hoppes
Sent: Friday, June 29, 2018 7:30 PM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] Fun with a solar site
He’s very reasonable way other than trial and error to determine which battery
has the shorted cell in it?
On Jun 29, 2018, at 21:21, Chuck McCown <[email protected]> wrote:
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 <[email protected]> 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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