The working principle of solar street lighting system

The emergence of solar street lights has greatly solved the difficulty of electricity use in remote areas. The peak power of the solar cell is the maximum output power of the solar cell under standard conditions, in units of peak watts, or expressed with the symbol WP. The output power of a solar cell depends on the solar radiation, the distribution of sunlight and the operating temperature of the solar cell. At different times and different places, the output power of the same solar cell is different. It is not as some people imagine that as long as there is sunlight, the rated output power will beat each other. It is normal to set artificial solar cells on the next page of the light. use. Calculated by area, the output power of each square meter of solar cells is about 120W. With the improvement of the conversion efficiency, the output power also increases accordingly. The selection of the output power of the solar cell module should be determined according to the light source power of the solar lamp, the use time and the local climatic and geographical conditions. During the use of solar cell modules, if a single solar cell is blocked by leaves alone for a long time, the blocked single solar cell will heat up and be damaged under strong sunlight, and even cause damage to the entire solar cell module. This is the so-called heat island effect. In order to prevent the heat island effect, the solar cell is generally placed obliquely, so that the surface of the solar cell cannot be attached with a shield. For any solar lighting system, the quality of the charge and discharge control circuit will directly affect the success or failure of the system application. Since the input energy of the solar photovoltaic power generation system is extremely unstable, the control of the battery charging in the photovoltaic power generation system is more complicated than the ordinary controller for charging the battery. A photovoltaic cell controller with good performance should have various protection functions such as battery charge and discharge control, temperature regulation, maximum power tracking and overcharge protection, overdischarge protection, short circuit protection, reverse connection protection, as well as automatic switching and time adjustment functions. Therefore, the reliable operation of the system is ensured, and at the same time, the solar cell module can intelligently output the maximum power under different temperature and irradiation conditions, so that the lighting system has high efficiency. Since the charging of the battery of the solar lighting system is directly provided by the solar cell, the energy obtained is not stable. All batteries with reasonable capacity and reliable performance should be configured to ensure the policy work of the photovoltaic power generation system. In solar photovoltaic lighting systems, maintenance-free lead-acid batteries are usually selected. Maintenance-free lead-acid battery is a new type of battery. It adopts a fully sealed method, with high discharge rate and stable characteristics; no need to add water; simple installation, small footprint, horizontal and vertical installation, and the expected life is generally 5-7 years . The principle of selecting half of the battery capacity is: first, it can meet the lighting requirements at night, and can store the energy generated by the solar cell modules during the day as much as possible, and at the same time, it can also meet the electric energy required by Liang Xu for lighting at night in rainy days. If the battery capacity is too small, it cannot meet the needs of night lighting. If the battery capacity is too large, the battery will be in a state of power loss for a long time, which will shorten the battery life and waste unnecessary investment. According to the actual situation, the solar street light can be selected from a variety of light sources such as 12V DC energy-saving lamps, low-voltage sodium lamps, high-pressure sodium lamps, and electrodeless electromagnetic induction lamps. No matter which light source is selected, its brightness and the power of the light source are directly related, and also directly affect the system configuration and investment cost. Under the same lighting time conditions, the larger the light source power, the higher the breadth, the larger the system configuration, the higher the cost; the smaller the power, the lower the brightness, the lower the system configuration and the lower the cost. General light poles and lamps can be used as the choice of solar lights. If the solution of directly installing the solar cell module on the light pole is adopted, the bracket of the solar cell module needs to be processed according to the area of u200bu200bthe solar cell module, and the wind resistance strength of the light pole should be considered at the same time. The selection of lamps and poles is wide and generally meets the requirements of use and aesthetics.