I just tested the batteries (direct to each terminal) with digital Multimeter and looks like one of the Exide Deep Cycle batteries has lost
a Cell. Readings were:
: house bank: 13.4V Unloaded and 12.4V Loaded with 4.8A
Number 2 in house bank: 10.74V Unloaded and 10.75V Loaded with 4.8A
Number 1 in house bank: 13.17V Unloaded and 12.25V Loaded with 4.8A
The bad Number 2 had one cell very low in acid, so I topped up but it had heavily gassed and was sitting in a bath of acid. I'll let it top up on the wind
gen and see if it is recoverable, but could have dropped the cell permanently...