The picture is years old Jerry and not relative to their current state.
As for balance the +ve is from battery 1 and the -ve from battery 4
My wife is the battery monitor and in 7 yrs she has not complained that the hair dryer doesn't work
With a healthy battery bank I have surplus charge in the sunny months. This is transferred to the other battery bank and when that is full it overflows to the engine battery.
If the weather is so bad that I run low I have a 60amp BtoB
Also I have the ability to combine all 8 batteries or change the duty of each bank.
I can also put a false D+ signal to the fridge to make it run from the solar instead of alternator