The 12-volt power supply is ideal for travelling by car, caravan or other vehicle with a 12V on-board power supply. This power supply allows you to keep food and drinks cold even while driving. Car fridges with 12V power are generally designed to be energy efficient and minimize on-board battery consumption. Most of these fridges also have built-in protection against over-discharging the car battery, which is an added benefit. But you still need to monitor the battery status, as long-term use may require power replenishment.