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Diagram looks good except many resources recommend pulling the main Pos cable from one series pair and the Neg cable from the opposite series pair for better balancing of loads & charging.
Some will argue there is no difference... I figure why not connect in the optimum configuration? ... it doesn't cost more and can't hurt whether it helps or not?
I would label each wire, draw a diagram, and take pictures is what I did.
Did the same thing! Labeled each battery 1-4 and then tagged each cable end on each battery. Also took pictures before taking the cables off. I got it back together with no issues!
When I got done with that I upgraded my solar panels to 400W which really helps keep them charged!