I'll confess, my battery maintenance isn't as good as I know it should be, but things got really bad the last couple days. The inverter shut down with very little load, and it was the morning after a very sunny day. So I shuffle down to the basement and test some things and yikes, SG on 2 cells is 1.100 or so.
I'll admit, this has been coming on for a long time. A few months ago I added water and noted that a couple cells were full and not down on water. Odd I thought. Better equalize. I didn't.
Anyway, two days ago I finally did an intensive corrective equalize. I ran the generator for 6 hours because, of course it was the only cloudy, calm day of the year.
I got the SG to 1.230 on the 2 bad cells and 1.265 on all the rest. The batteries got to 50c which isn't too good. Anyway, today is supposed to be sunny, but I won't be home. I set the absorb voltage to 60.4v which is only 0.4 above normal. Hopefully that brings the SG up the rest of the way.
Do you guys think these batteries will recover or should I be shopping?
Any tips for bringing them back to life?
For the people that keep up with this stuff, if you were to buy batteries today, what would you buy?
I need about 10kwh to 20kwh usable storage. I see 4kwh off brand lithium for $2500 cad which is getting down to almost lead price.