Service & equalize the batts and move the neg take off to batt #3.... After you have them serviced and equalized beg borrow or steal a bench top power supply with adjustable voltage control. Start at 13.2V with all battery caps off and bring the voltage up .1V at each step. Using a flash light you want to see all batts beginning to gas at the identical voltage. Cells gassing earlier than others are likely contaminated or beyond useful life. Put a sticker next to these cells to monitor them..
Thanks for the info, but a few questions.
First; charger= Xantrex TC40+.
They recommend equalization on fully charged batteries;
We aren't on the dock, so we have to run a gene to make power to charge and equalize (around 6 hours according to the book); we also have things like h2o & bilge pumps, instruments, volt meters, etc running which must all be turned off for the duration, correct?
What about the solar panels? Do they need to be disconnected from the house bank? Will they be damaged without a load?
By servicing, I assume you mean top up the water?
Again, at anchor, does all the above apply, even considering such a bench top PS can be had down here (where it's all 208/220 not 110) while using the PS?
Delta-T; This one bank, not two; in essence just one battery.
