Ok so I'm not an electrician nor a pro RV repair man, so keep this in mind. Your converter has one power lead out. If my memory serves me, you can run a line to your 12vlt fuse panel and then a line to the battery. My battery is connected to my fuse panel, and the converter keeps it charged.
I have the neg line from the converter grounded to the body, and the neg line from the battery is grounded on the same bolt.
So far no problems, I am using the 70 amp model.
I do not have an inverter, but if I ever did I would have to use some really big wires.
Not all those who wonder are lost.