Turns out it was a bad solar panel that had a short in the module > On Jun 30, 2018, at 11:58, <[email protected]> <[email protected]> wrote: > > A spool of 14, 12 or 10 gauge wire makes a pretty good load. > You want some decent current for a load test. > > 100 feet of 12 gauge would give you 12/1.5=8 amps. > Very nice current for load testing a battery. > > It will throw off 96 watts so it will get a bit warm. > But you don't need it on for more than perhaps 10 seconds. > > For long term testing I have put coils of copper wire in buckets of water. > > -----Original Message----- From: [email protected] > Sent: Saturday, June 30, 2018 9:38 AM > To: AnimalFarm Microwave Users Group > Subject: Re: [AFMUG] Fun with a solar site > > I agree, or put a load on each one by itself and see if one drops to a lower > voltage quicker. > Load testing is one of the best test methods. > > -----Original Message----- From: Robert > Sent: Friday, June 29, 2018 10:34 PM > To: [email protected] > Subject: Re: [AFMUG] Fun with a solar site > > 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. >>>>>> >>>>>> -- >>>>>> AF mailing list >>>>>> [email protected] >>>>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>>> >>>>> -- >>>>> AF mailing list >>>>> [email protected] >>>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>>> >>>>> -- >>>>> AF mailing list >>>>> [email protected] >>>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>> >>>> -- >>>> AF mailing list >>>> [email protected] >>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>> >>>> -- >>>> AF mailing list >>>> [email protected] >>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>> >>> -- >>> AF mailing list >>> [email protected] >>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>> >>> -- >>> AF mailing list >>> [email protected] >>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> > > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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