What size is your battery bank? Will it be larger in the future?
I have 440Ah of battery capacity in two banks. The AGM batteries will take a lot of current when 50% discharged. My alternator puts out 130A. Battery monitor has shown more than 90A going in from the truck alternator.
I increased the wire size from the alternator to the solid state relay, fused with a 150A megafuse. Used 2 AWG to a dedicated connection on the TC and back. Rewired the inside of the TC from that connector to a Blue Sea manual switch then onto the converter / battery bank junction, then to the batteries themselves. All 2 AWG. Overkill? Can easily recharge TC batteries and run TC heater and refrig while driving during winter road trips. Also have a 80A Converter so the generator doesn't have to run as long to get back to 90% SOC.
On my dodge, the voltage sensing to control the alternator is at the ECU. Also temperature compensated charging. So when driving at night, during the winter at temperatures of 10F or lower, the ECU has the alternator output at 15.7 VDC. If I've been driving for most of the day, the fully charged, warm AGM batteries inside the TC, could be overcharged. Thus the reason for a switch to turn off the power back to the TC.
