What automatic switching are you expecting? As near as I can see from the specs, the Xantrex Prowatt 1500 does not have an automatic transfer switch built in, so your RV must have some other mechanism to change from shore power to inverter. Like maybe plugging stuff directly into it? Or is there an external transfer switch somewhere?
Former owner of 2004 American Tradition and several other RVs
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC