You can choose the power source you like to start
At home, you can use it as a secondary refrigerator with AC power. When you're camping or enjoying some tailgating, this portable 12-volt refrigerator is come in handy and you just need to plug it into your car's lighter outlet or you can apply your solar systems.
You can use power sources as follow
Home use: 110V-240V AC power
Car/Big Truck use: 12/24V DC power
Small solar system+controler+battery
Other: power station，generator，backup battery, etc.