CAN A CAR BATTERY RUN A PORTABLE 12 VOLT FRIDGE?

No. Using a car battery to run a fridge will reduce the life of the battery and it will eventually fail. If you are running a fridge, the best option to use is a ‘deep cycle’ battery. These are designed to produce a small amount of power over a long period of time. Usually rated in Amp Hours, deep cycle batteries are designed to be drained and then recharged. Ideally you should run with two batteries, main battery (automotive) for starting the car and an auxiliary battery (deep cycle) for the accessories.