I'd bet a doughnut that a Parallax 7345 won't be a good fit with 6V AGM or FLA batteries. The output will not be right to keep them charged correctly or quickly.
A new programmable solar controller will do everything right with your batteries and you could keep the Parallax for those seldom times a 120V charger is needed.
Also, in a previous post, you have stated Amp Hour capacity in 6V batteries as below 200 AH. I believe that is incorrect. All 6v GC2 batteries I've seen have more than 200 AH capacity. Series mating two 6V batteries maintains the original capacity of amp hours but outputs 12V. I'd suggest to buy 6V FLA batteries from Costco, Sam's Club, or Trojans at a golf cart supplier. The Trojans will be the best but the others will be less expensive and work. AGM's will be expensive, period.
