You could call Heartland Customer Service at (574) 262-8030 or (877) 262-8032. Have your VIN # ready. They may be able to tell you the manufacturer/model of your Power Converter (120V AC converted to 12V DC). If you have a residential refrigerator, you'll also have an inverter (12V DC to 120V AC), but the inverter is not involved with charging the batteries.