MPP solar controller for high quality motorhomes, caravans and boats. Votronic solar controllers of the series "MPP" (Maximum-Power-Point) with "IU1oU2" charging characteristic are connected as a link between solar panel(s) and battery(s). With MPP technology, the controller continuously and automatically determines the maximum power point (MPP) of the solar panels several times per second. It then transforms the excess voltage of the solar module to a higher charging current for the battery (realized by high frequency switching controller technology with high efficiency). This charging current gain ensures shorter charging times and the best possible power utilization of the solar system. The MPP solar controllers operate fully automatically, are maintenance-free and offer the following functions: