Hi Jenny, what type of fridge are you using? If its a 3 way or gas/12v, it will be set up so it only runs on 12v when the engine is running, by means of a relay, this is because it will flatten a leisure battery in a few hours. If its a modern 12v unit its a different setup, and a solar panel will help. I put a small panel in my van and it really helps keep the leisure battery up. So the answer for you is to run the fridge on gas unless you are on a mains hookup?
