As IdealStandard mentioned, is all about the fridge, if you have a compressor you will be ok, but a condenser really eats the power. I had a chat with with a company at The motorhome show last year and they told me 130w would be best. We bought a cheap 150w folding panel from eBay, we ran off it for 4 days last weekend, 2 of those days were heavy rain. The battery never went below 3/4 charge. My advice would be to go for the biggest panel you can afford.
As IdealStandard mentioned, is all about the fridge, if you have a compressor you will be ok, but a condenser really eats the power. I had a chat with with a company at The motorhome show last year and they told me 130w would be best. We bought a cheap 150w folding panel from eBay, we ran off it for 4 days last weekend, 2 of those days were heavy rain. The battery never went below 3/4 charge. My advice would be to go for the biggest panel you can afford.