[rames14]

As Bob mentioned, the OP has standard deep cycle batteries. They are not the same thing as the deep cycle that Creeker mentioned. Rather than putting money into charge system, I would recommend spending $100 on a smart shunt (Victron) monitor and also looking at lithium batteries if you are boondocking a lot. Also, lead acid drops voltage at a much quicker rate than lithium. With my last rig, I used a Bogartbattery meter and 4 6v batteries. I usually was under 12v before I got to 50% discharge.