The SLK72M6L is a 72 cell monocrystalline module and the SLK72P6L is a 72 cell polycrystalline module. Both are available in black and white. The maximum power generated by the polycrystalline modules is 305 Wp with +3/0 percent tolerance. They are UL, TÜV and Intertek certified for worldwide applications. The efficiency of the polycrystalline modules is up to 15.7 percent and that of the monocrystalline modules peaks at 16 percent.