Have you thougt of a gas fridge/freezer,a lot more economical and you don't need a genny banging away all day.Ours lasts about 6 weeks on a bottle of gas and bottles of gas are about 12 euros.
Speaking from experience an electric fridge/freezer will be working flat out with overtime in the heat of the summer,the fridge motor will get dangerously hot and will use gallons of electickery.