1. On the underside of the controller I see a screw with a lock washer, is that the ground for this device?
2. What gauge wire should I use? The rest of the system will be 10AWG. So 10AWG?
3. This is going into a travel trailer. The chassis ground of my trailer is hooked directly to the negative terminal of my battery. Would I just attach the controller ground directly to my battery negative terminal too?