The "Sonnenstromfabrik" (Solar Power Factory) is the most advanced manufacturer of solar modules in Europe, renown for quality leadership. Taken over by CS Wismar in 2016, they produce top quality solar modules, „Made in Germany“ and living up to their slogan "Modules built for eternity".

CS Wismar offers a 26 or 30-year performance guarantee and 12 or 20-year product warranty for solar modules.