I have a 19 - 30A is what you need to get all electrics to work : air conditioning and all.
But connected to a 15A circuit will do fine if you do not use the AC - I do this all the time when parked at home, as I do not have a 30A plug. It charges the batteries and I can use everything else.
You will need a 30A to 15A adapter, a must have in my books.
Denis & Diane
2010 Sabre 31REDS
Ford F-250 2011
* Happy Campers *