I am trying to purchase a charge controller for a system that has two different batteries. One is a sealed lead-acid battery and one is a deep cycle Gel battery. When looking at solar charger reviews, it looks like the charger is supposed to be set to the type of battery that you have and there are different settings for a lead-acid battery and a Gel battery. The solar panels total 550 watts, so I am assuming a 60A controller is needed. Advice anyone?