Sunforce 39305 650-Watt High-Efficiency Polycrystalline Solar Power Kit High-efficiency polycrystalline solar cells from Sharp provide advanced power output Weatherproof solar cells feature durable aluminum frames with tempered glass coverings Includes five 130-Watt polycrystalline solar panels, a 50-Amp Pro-Series charge controller, a voltage tester, and mounting accessories 25-year solar panel warranty Kit is easy to install and virtually maintenance-free