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Conventional sources of energy to bring two types of questions: One is the energy crisis; the second category is environmental pollution. Eyes into the world of renewable energy, hope to be able to change the use of renewable energy sources of mankind's energy structure to maintain long-term sustainable development. Because of its unique advantage of solar energy has become the focus of attention. Abundant solar radiation is an important source of energy. Solar radiation in human inexhaustible inexhaustible renewable energy, clean energy is a green, no boundaries, no environmental pollution, free use of human energy. In the effective use of them, Dayang can use in recent years photoelectric most dynamic and fastest-growing areas of research. It is the use of solar energy has more than 3,000 years of history. More than 300 years ago began as a solar energy and power use. The international arena in recent years the rapid development of photovoltaic power generation, the world has built more than 10 MW of photovoltaic power generation system, 6-megawatt photovoltaic power plant-level networking. United States is the pioneer of photovoltaic power generation and national development planning in 1997 in the "millions of roofs" program. Japan plans to start a new sun in 1992, to Japan in 2003 the production of photovoltaic components accounted for 50% of the world, the world's top 10 companies of which four are in Japan. Germany is second only to Japan after the world's fastest-growing photovoltaic country. Its new Renewable Energy Law provides for photovoltaic electricity generation Internet has greatly promoted the development of photovoltaic market and industry. Switzerland, Italy, France, Spain, Finland and other countries, and also the development of photovoltaic development plans, and putting in a lot of funding for technology development and accelerate the process of industrialization. Now the community can not do without electricity, a variety of more and more extensive use of electrical equipment, demand is growing. Rechargeable batteries are also more general application. As the energy and environmental issues before us, the use of clean energy to the battery charging is the future direction of development. In this paper, the use of the design of a solar radiation increases as the external power source control circuit which consists of Ni-MH battery charger. Solar charge control circuit is based on the direct conversion of light energy to electrical energy for the design of the nickel-metal hydride battery for the purpose of constant current charge control. When solar radiation there is enough light, the solar charge control circuit system to be able to take advantage of solar energy for charging rechargeable batteries in the charging of rechargeable batteries at the same time on the monitor. System protection circuit designed to prevent the rechargeable batteries have been recharged since the depth of permanent damage caused by their own. The system can adjust the number of rechargeable batteries, fast charging time, as well as the trickle charge current size, but also the use of an external resistor can be set to change the fast charge current. Keywords£ºSolar Energy£» Ni-MH battery £»Chargers