... panel: 1. A grade high efficiency solar cells. 2. TUV/IEC/CE/CEC 3. Fast shipment 4. 25 years warranty 255W ... % in 10 years and no less 80% in 25 yearsSTC (Standard Test Condition: 1000W/m2, AM1.5, and 25°C) High ... Supplier of 255W mono crystalline solar panel, PV module, TUV, IEC, CE, CEC certified