Add up what your caravan actually draws in a day — appliance by appliance — to get a real daily Wh figure you can use in the Off-Grid Days and Solar Requirement calculators, instead of guessing.
Work out your daily power usage
Fridge and lighting come pre-filled with typical touring averages — adjust them to match your actual gear, and leave any appliance you don't have at 0 hours. Real usage varies with weather, insulation and how hard you run things. Once you have your daily Wh figure, use it in the Off-Grid Days Calculator and Solar Requirement Calculator.