My fifth wheel is going on seven years now and the stock 12v batteries are finally going the way of the Do-Do. I want to replace them with new 6v. I've made this conversion before and liked it. But I also want to invest in a solar panel system, so the question is; are solar panel systems compatible with 6v batteries in series? Or do I need to stick with 12v batteries in parallel. Will I need to look into a higher amp output rating to charge the 6v batteries? Advise me before I needlessly spend.