Battery problem thoughts much appreciated!

[john61ct]

I scanned your (OP's) early posts and don't see any indication of a proper charge to Full ever taking place, as in something like "14.7V Absorb held until trailing amps drops to 4A"

The BM indicating SoC (or even amps) cannot be relied upon without manual verification / calibration with known-trusted instruments.

A proper load test takes 20 hours, and should be conducted on each unit separately.

The results ideally take the form of a logged data graph showing the time vs both volts and amps, charging at say .2+C then discharging at .05C with the final conclusion being the remaining AH capacity at that latter rate.

[john61ct]

> You really got 10 years out of AGM ? you sure those were AGM ? I believe it is a first time I hear such a good report on those.

The number of charge cycles to what %DoD is what wears, much faster than the calendar if stored properly while not cycling.