12-Volt System
The DC electrical system that powers most of a truck camper's essentials: lights, water pump, furnace fan, vent fans, USB charging, and the refrigerator (if 12V-capable). The 12V system runs off the battery bank and is independent of shore power. Understanding your 12V power budget is critical for boondocking — LED lights draw almost nothing, but a furnace fan running all night can drain a battery fast. Most modern campers are shifting toward larger 12V systems with lithium batteries and inverters.
Related Terms
Lithium iron phosphate batteries that have largely replaced lead-acid in modern truck campers.
Photovoltaic panels mounted on the camper roof (or carried as portable units) that charge the 12V battery bank from sunlight.
A device that converts 12V DC battery power to 120V AC household power, letting you run AC appliances (coffee maker, laptop charger, blender) without shore power or a generator.
An external AC electrical hookup (typically a 30-amp plug) that connects your camper to campground or household power.