In the meddy, solar panels are better than wind, in Portugal, Azores etc, wind is better, but both systems are expensive. Solar panels are cheaper in Portugal than UK. Power genration is always a problem for some people, but I have friends who dont use a fridge in the med, they just modified their eating habits, to live cheaply. I think if you are taking a year out or whatever, and are young, why not spend a bit more and be comfortable, with fridge etc. You will have to look round, but secondhand stuff is always available at boatjumbles etc. Autohelms, should be waterproof! But consider fitting below the deck, if you can, if not get in touch with the manufacturers and see what they say about super proofing! Running the engine is not a bad option when in the med, because you will be doing a lot of motoring, if you want to go anywhere! I hope this helps a little.