toxsickcity:
Sorry everyone,I have been away, thanks for all the replies.
to answer a few q's
-Same brand/model/age
-bank de-equalization happens maybe 2-3 times a year, just I forget it and have a blackout for a night
-Battery are maintenance free deep cycle
-Charging source is approx 1500Watts of solar. (50-60Amps)
-I dont equalize as it over voltage my inverter... I might consider this for solo battery health as each cell gets an equalization.. might meaning disable inverter for a day when this happens.. not really doing this tho.I have an image of how my batteries are wired together for 24v
replacing the batteries is an option, but Id rather not! as it's time consuming and expensive.
I am sure a simple charge balancer will help prolong the life of the batteries also.
You are missing one essential item of information. What is causing the two sets of batteries to be discharged unevenly.
Also, post a diagram showing the solar panel circuit that normally charges the batteries.
I suspect it would be better to use pairs of 12v batteries to make 6 x 24v batteries and then connect the 24v batteries together as in @Daz1712's diagram (and now, also in @TomGeorge's next Reply), rather than create two huge 12v batteries and then connect them together.
How old are your batteries?
I also remain of the view that some of your batteries will need to be replaced as they have been over-used relative to others. And adding a few new batteries into a large group of used batteries will probably shorten the life of the new batteries making the whole problem expensive to solve.
...R