Grid photovoltaic system consists of a photovoltaic cell matrix, controller, and inverter composed without battery energy storage directly into electrical energy fed into the public grid by grid-connected inverter. Grid-connected solar PV systems compared to off-grid solar photovoltaic system eliminating the need for battery energy storage and release process, which reduces energy consumption, saving floor space solar power subsidies, but also reduces deployment costs. It is worth the price stated is the solar, Yuxiang grid solar PV system for a large part of government power and developed energy-saving cases. Grid-connected solar power generation is the development direction of solar photovoltaic power generation, is a very promising energy technologies of the 21st century. Solar cell applications of solar power controller (PV controller and solar hybrid controller) issued for the regulation and control of solar energy in the annual generation capacity, while the energy-adjusted sent direct solar load or AC load, on the other hand The excess energy storage batteries sent, when the electric load of the hair can not meet the needs of power sent to the controller battery load again. After the battery is fully charged, the controller to control the battery is not overcharged. When the energy stored in the battery is done, the controller to control the battery will not be over-discharge protection battery. When the poor performance of the controller, the battery life of great influence, and ultimately affect the reliability of the system of solar batteries, day-giant energy technology (certified), Bristol solar energy provided by the Wuhan days Hui Technology Co., Ltd. giant. Wuhan Tian Hui Ju Technology Co., Ltd. (www.thjnkj.com) (www.thjnkj.com) is a leader in Wuhan, energy-saving equipment, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum to meet customer needs. In the day-giant energy technology leadership with the staff warmly welcome all inquiries negotiations to create day-technology giant to a better future.