I am real tired of replacing lead cell batteries every year. I am going to go two 12 volt to get 24volt. I have a lowes pontoon set up to troll for crappie.What I am asking is what AH do I need. Would a 50 or 60 AH work for this? It is a fairly light pontoon 19 feet with a115 on it. I bought aNocoGen 5x2 2bank 10 amp charger to put on the boat. I am assuming this will all work.{Please advise !! Thanks in advance