This version drastically reduces energy consumption, the electrical system "feel" when the engine is under operation and there is an alternator energy surplus, therefore it works the compressor to the maximum level in order to gather cooling as much as possible, the average consumption reduces to at least 30% if the boat engine works for at least one hour a day; if the engine is switched off, it reduces the operation of the compressor to the minimum in order to use the least quantity of energy as possible; size equal to the standard version.