Poly-crystalline Panels consist of high-efficiency silicon cells that are individually characterized and electronically matched before interconnection and laminated with toughened glass, EVA and Back-sheet of high quality. Adopt most advanced PERC cells technology, high conversion rate. After assembled with anodized aluminum alloy frame, cable and junction box with MC4 connectors. These panel modules can work for a long period. They can also withstand the storm, strong wind and hail impact,etc. More than 20 years lifespan.