MS Turanor PlanetSolar: Biggest solar boat catamaran in the world MS Turanor PlanetSolar is a multihull vessel topped by a large array of photovoltaic solar panels, constructed by Knierim Yacht Club, in Kiel, Germany. Built in 14 months, the biggest ever solar boat has impressive dimensions but is both silent and clean. MS Turanor PlanetSolar is the biggest solar boat catamaran in the world, with its 537 square meters of photovoltaic panel power 6 blocks of lithium-ion battery..