Photovoltaic panel module is a power generation device that generates direct current under sunlight. It consists of thin solid-state photovoltaic cells made almost entirely of semiconductor materials, such as silicon. Since there are no moving parts, it can be operated for a long time without any wear. Simple photovoltaic cells can power watches and computers, while more complex photovoltaic systems can illuminate homes and power the grid. PV panel modules can be made into different shapes, and modules can be connected to generate more electricity. PV panel modules are used on roofs and building surfaces, and even as part of windows, skylights, or sunshades. These PV devices are often referred to as annex PV systems. The photoelectric conversion efficiency of monocrystalline silicon solar cells is about 15%, up to 24%, which is the highest among all types of solar cells at present, but the production cost is high and widely used. Because monocrystalline silicon is generally packaged with tempered glass and waterproof resin, it is firm and durable, and its service life can generally reach 15 years and 25 years. The production process of polycrystalline silicon solar cells is similar to that of monocrystalline silicon solar cells, but the photoelectric conversion efficiency of polycrystalline silicon solar cells is much lower. The photoelectric conversion efficiency is about 12% (sharp, Japan, july1,2004), which ranks as 14.8% of the most efficient polycrystalline silicon solar cells in the world). In terms of production cost, it is cheaper than monocrystalline silicon solar cells, with simple material manufacturing, power saving and low total production cost. Therefore, it has been greatly developed. In addition, the service life of polysilicon solar cells is shorter than that of monocrystalline silicon solar cells. In terms of cost performance, monocrystalline silicon solar cells are slightly better.