Humidity Proof (Marine) Version is suitable for use in caravans plus boat/marine applications - both the controller and display must be installed inside. MPP Solar Controller for high-quality campers, caravans and boats. VOTRONIC Solar Controllers of series "MPP" (Maximum-Power-Point) with characteristic line of charging „IU1oU2“ are the link between solar panel(s) and battery (batteries). Controllers according to the MPP technology...