Just make sure that the controller is either placed very close to the batteries OR it has remote battery voltage sensing. At 20 Amps I loose a full volt between the controller output and the batteries. It is almost impossible to get them fully charged since the controller starts to taper off when the batteries reach 13.8 Volts because of the voltage Drop, it is seeing 14.8 :S
Still trying to decide on how I'm going to get around the problem. :h I'll probably have to buy a new controller and put it closer to the batteries. The controller I have is a wall (panel mount) in the galley and won't lend itself to mounting in the electrical compartment.