my dealer said the ac is the only thing needs 30 amp, though he said you could run the ac on 20 if nothing else was on (I have tried that but does not work well, kept tripping the breaker). All the campgrounds I frequent has a 30 amp connection and everything works when on 30 amp. Now, we have tripped the 15 amp breaker in the camper when running the coffee maker and an electric room heater at the same time, oops. As for the mattresses, they do not feel warm until you lay on it. Then once you are in bed, they heat up nicely and keep us toasty when the temps dropped to the 20s outside.
The lights and water pump are dc, they will be powered through the converter when you are plugged into shore power. If not on shore power, then the battery supplies the power to these items.
So basically, the shore power only items are
The dc powered items are
If you have a three way fridge, it runs on either shore power, battery, or propane.
HTT: "EscapeII" 2016 Shamrock 23WS (current)
PUP: "Escape" 2010 Rockwood HW 277 (gone)
TV: "Bruce" 2011 Dodge Durango V8 Hemi Crew
Just us gals (me, Sis and our daughters)
Traveled 19520 miles and 209 nights in 7 years and counting