Powerful modules for stand-alone systems and mains coupling High-output modules from SCHOTT Solar are available from a power class of 50 to 300 Watt. Crystalline EFG and MAIN cells with a high-quality finish provide the highest energy yields. The modules have been judged many times as the winners in independent studies and tests. Each module type is designed for low-cost system integration, from the frame construction through to the junction box.