As the Earth's resources become more and more scarce gradually, the cost of basic energy investment increasing higher and higher, and a variety of safety and pollution problems are everywhere, solar energy as a new, security, environmental protection "inexhaustible" energy, is taken more attention increasingly. Also with the development of solar photovoltaic technology, solar lighting products have dual advantages of in environmental and energy-saving. The application has been gradually scale in garden lights, lawn lamps, etc. The solar street lighting has also become more and more mature.
Using Principle of the photovoltaic effect to convert solar input into electrical energy output, after charge-discharge controller the energy is stored in batteries, during night when the illumination gradually reduced to 101ux, and solar panels output voltage about 4.5V, the controller detects the voltage value, then the battery discharge to the LED light. After discharge for 8.5 hours, the controller finish action, finally end the battery discharge. The main function of the controller is to protect the battery, basically including: overcharge protection, over-discharge protection, light control, time control and anti-reverse connection and so on.
At present, the initial investment in solar LED lighting is still a major problem. However, the luminous efficiency of solar cells is increasing, but prices decreasing gradually. Compare with solar energy, the conventional fossil fuels are more and more less, also it will result in serious pollution. Therefore, the solar LED lighting as a burgeoning outdoor lighting will show us endless vitality and broad prospects.
Solar LED street lights mainly composed by the solar cell parts (including frame), LED lamp, the control box (with controller, battery) and the light pole parts and so on; solar panel light efficiency mainly up to 127Wp/m2, high efficient and wind-resistant design; LED lamp using a single high-power LED (30W-100W) as light source and high brightness chip.
