I wanted to check Arild's assertion that opening the door of a fridge doesn't amount to much in terms of energy lost. I asked the question: assuming a ten cu. ft fridge, assuming all the cold air inside drops out when you open the door, assuming you open it about fifteen times a day, how many AHrs of energy does this consume from your batteries. The answer is no more than about 1.5Ahr per day. Since a typical fridge consumes about 25-75AHrs per day due to heat loss thru the walls this is indeed a small factor. Maybe Arild can check this estimate. On the other hand, I have never seen a commercial front opening fridge with adequate insulation. The manufacturer is marketing interior volume and must decrease the insulation thickness to maximize this. Aside from the very expensive vacuum panels, the best insulation still requires four inch thick walls to be a good design and not require engine charging. By the way, another big energy drain are the fans and pumps on forced air or hydronic heaters. For summertime cruising in SE Alaska they typically draw 3-5 amps when on. From a battery drain point of view, at anchor, you are much better off with a Dickinson type stove or heater. They require negligible battery power. Of course the same set that likes their boat to be a house will say that Dickinsons don't distribute the heat very well into all spaces. That is true but this is a boat not a house. A few years ago I sailed my sailboat over to Pier 39 in SF. I waited in line at the harbormaster office to rent a slip. When my turn came I was told, "I'm sorry but the only slip left has no power." I said I don't need any power. He then said. "Also the slip has no water". I said that is ok I don't need a water hookup. A fellow behind me muttered to his friend, "What did he come in, a canoe?" It might be of interest for some listees to know that the energy conservation work done at the Lawrence Berkeley Laboratory since the late 70's, has saved the country constructing over 150 major power plants. That is an amazing achievement. Further they have convinced China to agree to the energy conservation standards now in effect in California. That will have even greater impact. Richard P