I am building a system for my camping trailer and I am having a hard time finding out what charge controller to use. I want a 24v system as I will have a small fridge and will use 24v to 12 dc to dc when needed. I am going to use the panel pictured below and two of the batteries pictured below. I am trying to keep the cost down, any help on what charge controller to use and what specs I need would be a lot of help.