The fast battery charger I had made for mine has an external temp sensor built in. if the machine senses battery or temp problems it shuts down to a low rate. I use a multi step main charger, plus a maintenance pulse charger as a separate system. Mine also balances the charge and monitors each battery for balanced charge. No the idiot doesn't know how it knows, nor do I give a squat, as long as seem to do what it does. First one died, so they made me a new one for free, it is way heavier but double fans etc. Now if I just had a clue about rebuilding the old one to do lighter charge work, oh well maybe Goodwill can fix it.
Just a note, ----- Cal
Sent: Thursday, September 25, 2014 7:59 PM
Subject: [Electric Boats] Re: Batteries, A note on Service Life
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: "cal" <h20dragon@centurytel.net>
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