In today's world, oil, coal, natural gas and other energy is facing the risk of resource depletion, environmental pressures are also increasing, therefore, environmental protection, energy conservation has become a worldwide all walks of life strive for the goal. Solar energy is a clean, green energy, solid-state semiconductor light-emitting diode (LED) is an environmentally friendly, energy-saving, efficient electric light.

   In the past hundred years, the lighting source has experienced three important stages: incandescent, fluorescent, HID lights. Which is the first generation light source incandescent, fluorescent is the second generation light source, high-intensity gas discharge lamp is a third-generation light source (HID). LED light source has broad prospects for development in the lighting industry today is called the fourth generation light source. LED as a novel semiconductor light source with long life, high luminous efficiency, low power consumption, short startup time, solid structure.

   The solar photovoltaic power generation is dependent on the solar panel manufacturers, the use of the electronic characteristic of the semiconductor material, when the sunlight in the semiconductor PN junction, a strong built-in electrostatic field is generated, since the P-N junction barrier zone, resulting in the potential barrier region of nonequilibrium electrons and holes in or generated in the potential barrier region, but diffusion into the non-equilibrium electrons and holes of the potential barrier region in the built-in electrostatic field under the action of the respective movement in the opposite direction, leaving the potential barrier region, a result, the P region elevated potential N-area potential decrease, thereby to generate a voltage and current in the external circuit, the conversion of light energy into electrical energy.

Solar photovoltaic systems can be roughly divided into two categories, one is the grid system, and the utility grid connected through a standard interface, like a small power plants; the other is a stand-alone power generation system that is in their own within the closed system to form a circuit.

And power generation systems, photovoltaic array will receive the polycrystalline solar panels radiation energy into high voltage DC after high-frequency DC converter, after inverter inverter to the grid output power grid voltage with the frequency, in-phase sinusoidal AC current. Stand-alone power generation system PV array will first receive the solar radiation energy directly into electrical energy supplied to the load, and excess energy after charge controller in the form of chemical energy stored in batteries.

   LED semiconductor lighting source in addition to has the advantages of long life, high luminous efficiency, small size, light weight, environmentally safe and reliable, there is a significant advantage of LED startup and operating voltages, so without the use of ballasts. This saves costs and energy consumption while also greatly reducing the response time pass off.

   Solar photovoltaic technology combined with LED lighting perfect key lies both with the direct current, low voltage and can match each other. Therefore does not need to be a combination of both the direct current generated by solar cells into alternating current, thus greatly improving the efficiency of the entire lighting system. At the same time, by means of grid technology or the use of battery charge and discharge energy, to make it more obvious advantages. With the in-depth study of the technology, the LED luminous efficiency is improved, high brightness LED going to come out, is bound to replace general lighting electric light, and a large number of energy-saving and pollution-free.