just to echo the solar suggestion, we have a pair of BIG batteries rigged as 24volt, charged via mains, alternator or a pair of solar panels which are also a fair size. In the Outer Hebrides of Scotland (are there any others?!) last winter we almost had to drive every day to maintain charge to run a 50?litre fridge, inside lights, eberspacher, water pump, 100 miles wasn't enough.
St Tropez a few weeks ago, clear blue sky, long days meaning less lighting used, but two showers each a day and the fridge working harder in 35+ daytime 25+ nighttime, we didn't turn her on for a week and lost no charge just with the solar panels 
not sure what the weather will be like, and panels aren't cheap, but have a longer life than batteries!!!
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