Cheap China Solar Controller Failure
For a couple days been noticing higher than the 14.6 voltage,.....going to 15, and even 15.5,....I knew something was not right. The next day it was showing 16, then quickly went to 17+.......I quickl...
Forum Discussion
Salvo wrote:
I believe you have it backwards. As far as I know, 100% of the AH gets stored in the battery, while perhaps 90% of WH goes in battery. The battery is fully charged at 12.8V, yet we're charging at 14.8V. Where are those 2 extra volts going? This is lost power that goes to heat. It's the cost of charging a battery. That's why WH is meaningless when you what to know how much you put into the battery.BFL13 wrote:
Salvo, even if you use AH, you still don't know how many went into the battery and how much was lost to heat with "accuracy" AFAIK.
It is the same sort of thing in AH. Trimetric "allows" for ISTR 4% for heat on its AH counter over all the SOC range when recharging. They do say it goes crazy once the battery gets above 80% SOC. Barre, in his book, says it may be 10% on average.
If all you have is the AH figure for what the battery charger put out, you don't know how much went into the battery itself. Especially when that amount varies, where it gets really bad once the battery gets to "gassing voltage" and more of the total is lost to heat. Accuracy isn't even close. "It depends" etc.
