It's just s straight Mastervolt charger. It plugs into a household-style twin wall outlet in it's compartment beneath the galley counter. I added a 300w inverter next to it and used a child-proof outlet cover to leave only one outlet open so they can't both be plugged in at the same time. (Also labeled it with all kinds of warnings so only an illiterate could make a mistake.) The inverter is used only for light-duty (portable charger bricks, coffee grinder etc.)