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No the solar panel is not big enough.

£30 quid to put in a second charger in boot + cost of second battery and you would still be in the same position.

Bottom line is fridge needs too much power for stored electric. 

If it's a coolbox type then freeze 4pint milk bottle filled with water and as much food as you can before you go.  That will last you 3/4 days no problems.  Keep it in the shade and don't leave the lid open any more than absolutely necessary. 

If we should get a heat wave and you bottle of water defrosts then the lid is the right size to be refilled with supermarket ice.