1.High-efficiency silicon solar cells,More power in peak hours through cells. 2.Optimized module performance with Nominal Voltage 24/18/12V DC 3.Bypass diodes to avoid hot-spot effect,Cells are embeded in a sheet of TPT and EVA. 4.3.2mm high transmission low-iron,tempered glass,Unique esthetic appearance of cells. 5.Attractive,stable,heavy duty anodized aluminum frames with convenient mounting-access,for high wind-pressure and snow-load 6.The backside frames are equipped with drainage holes.So we eliminate the risk that rain or snow water may accumulate in the frames lumen and freeze or even bend the frame in cold season. 7.25 Year Limited Warranty