One of the nice things about the Dual Pro Quad charger I use to finish charging my 48 volt AGM bank it has temperature probes in the charging leads on each battery in the string. So far all batteries in the string have been behaving themselves for seven years. Though I did have a little reminder recently that sometimes little things in the charging circuit can make it look like you have major battery issue too. http://biankablog.blogspot.com/2014/09/sometimes-its-little-things.html
I was glad I had my helm mounted instrumentation panel to do a quick check to verify the battery was charged and did not have to even pull out a DVM to narrow the problem to a bad fuse connection in the charger lead.
Mike
http://biankablog.blogspot.com
On Thursday, September 25, 2014 10:59 PM, "John Acord jcacord@gmail.com [electricboats]" <electricboats@yahoogroups.com> wrote:
I would second what Cal said, that it is not a good practice to mix different aged batteries in a series string. They won't share the current equally, the newer batteries will be stressed with greater current and the older batteries will pull the total voltage of the string down causing more voltage drop on the good batteries.
We are pretty aware of the need to monitor battery voltage. What we do not do so much is monitor battery temperature. Batteries getting hot are a symptom of problems and should be monitored. A lot of us are using lead acid batteries. For good battery life, and to avoid thermal runaway, the charge voltage should be adjusted for battery temperature. Not the ambient temperature (although that will affect battery temperature) but by putting a temperature sensor on the battery terminal which is the closest you can measure to core temp. I have not studied it but suspect the same conditions apply to discharge. With the operating currents of our boat motors it might be something to look into. But at least sensors on the batteries for an overtemp alarm would be appropriate.
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Posted by: Mike <biankablog@verizon.net>
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