This RV air conditioner has a 12v/24v/48v 3 series and is powered only by the car battery, without the need to start the engine. It not only has the superb cooling performance of 13500BTU, but also has a heat pump, so even in the winter, it can also provide you with warm air with very low battery consumption. avoiding fuel consumption and exhaust pollution. A 12V air conditioner consumes approximately 60A of current per hour, and it is recommended that the car battery capacity be above 200AH. All the inside tubes are made of copper material.