1. Solar panel/solar module/PV module/produced with high conversion effeciency, which purchased from Q-CELLS, CONERGY, ERSOL; 2. High quality of TPT, EVA, Tempered glass, aluminum frame to laminate solar panels and waterproof junction box and label; 3. With long lifetime of 25-30years, 5-10years warranty with and stable characterstics and performance; 4. We laminate solar panels from 5W-280W, with mono crystalline and poly crystalline solar cells. Electrical Characteristics: Model SGM-15W Cells size (mm): 125*20.8 Cells per module: 2*18 Module size (mm): 280*445*25 Power tolerance: +/-3% Nominal peak power(WP): 15 Nominal voltage(V): 18 Nominal current (A): 0.81 NOCT: 45+/-2centigrade Voltage temperature coefficient: -0.33%/centigrade Current temperature coefficient: +0.05%/centigrade Power temperature coefficient: -0.23%/centigrade Open circuit voltage (Voc): 21.6 Short cirsuit current(Isc): 0.88 Conversion efficiency: 14.97% Operating temperature: -40 to+85centigrade Max system voltage: 600V DC.