... attend HK Lighting Fair in October. 275W Mono Solar Panel 72 Solar Cells Home RoofCertificate:TUV, CE, IEC, ISO, UL ... %Cell Efficiency(%):16.0%Tolerance:±3%Electrical Characteristics:Solar Cell:Monocrystalline156mm*156mmConfiguration:72cells,6*12seriedDimension:1955*990* ... and workmanship, 25 years power output warranty Cells are individually tested, characterized and modulated prior to interconncetion