I’ve got the new battery wired in and I have run the wires that I’ll need to patch in the solar charge controller. Why do I need that? Good question, from my understanding, the current/voltage coming in from the solar panel is kind of all over the place and the controller sets things right to be able to charge the kind of battery that you have. I should research to see why there isn’t one for the charging from the vehicle or shore power but I suspect they are already set up for 12v charging.