expected normal voltage drop from load?
Is there a rule of thumb or guidance for an expected voltage drop based on amp load on a pair of 6V GC batteries? I was tinkering in my trailer this weekend and ran a 750 watt AC electric heater off ...
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ewarnerusa wrote:BFL13 wrote:
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Those poor batteries have been neglected for several months, and now they are going to be neglected some more, due to the situation. Perhaps it can't be helped, but IMO expect to be buying new batteries in the spring if you can't get them in and do some TLC on them (which might not work by now, but is worth a try for sure)...
I've always thought my solar did a nice job with my batteries. What additional neglect do you mean? I have put it through my charge controller's equalization cycle lately as well. 15.3 V for 2 hours.
At 32F, 15.2 is more like 14.7 at 80F, An E needs equivalent to 15.5 or so at 80F which would be 16.x in the cold. An E takes 8 to 10 hours, not 2 when the batts badly need an E, and for recovery efforts it could need to be repeated to get SG up where it belongs.
You don't know how much any of what you did do achieved without checking SGs to measure progress. It takes hours and hours and days and days to do a proper "recovery" with measurements of progress along the way.
Perhaps you actually did more than you indicated, but my impression (could be wrong) is the batts didn't get nearly enough TLC and now they are still in bad shape and under a snow bank getting worse. ?
So that's what I meant about likely needing new batts.
