The principle of solar energy system: solar led street light use the principle of solar cell's wide volt effect. During the day, the energy produced by solar cell absorption by solar energy is charged by the controller to the battery group. When the night falls or the light intensity around the lamp is low, the battery provides power to the DC lamp. Load. In any case, the DC controller can ensure that the battery is not damaged by overcharge or over discharge in the sun, or in a long period of cloudy weather. It also has the functions of light control, sound control, temperature compensation, lightning protection, anti polarity protection and so on. Solar street lamps consist of solar panels, solar controllers, batteries, light sources, lampposts and lamp housings.
1. Solar panels: Solar panels are the core part of solar street lamps and the most valuable part of solar street lamps. Its function is to convert the radiant energy of the sun into electrical energy or to store it in the battery. In most of the solar cells, there are three types of solar cells: monocrystalline silicon solar cells, polycrystalline silicon solar cells and amorphous silicon solar cells. Polysilicon solar cells are used in the East and west areas with good sunlight and good sunlight, because the production process of polysilicon solar cells is relatively simple, and the price is lower than that of monocrystalline silicon solar cells. In the southern areas with more rainy days and less sunshine, monocrystalline silicon solar cells are adopted, because the performance parameters of monocrystalline silicon solar cells are relatively stable. Amorphous silicon solar cells are better when outdoor sunlight is insufficient, because amorphous silicon solar cells require less sunlight. The development of the other second generation solar cells is about to make breakthroughs. Its core component is an adhesive film, that is, thin film solar cell materials.
2. Solar controller: In solar energy lamps and lanterns, a good charge and discharge controller is essential. In order to prolong the service life of the battery, it must limit its charging and discharging conditions to prevent the battery from overcharging or deep charging. In places with large temperature differences, the qualified controller should also have the function of temperature compensation. At the same time, the solar controller should have the control function of the street lamp, including light control and time control, and have the function of automatically cutting and controlling the load at night, so as to prolong the working time of the street lamp in the rainy day.
3. Battery: Because the input energy of the solar photovoltaic system is very unstable, it is generally necessary to configure the battery system to work. There are lead-acid batteries, Ni Cd batteries and Ni H batteries. Most of the selection of battery capacity should follow the following principles: first, the energy of daytime solar cell components can be stored as much as possible to meet the night lighting, and the energy needed to meet the lighting of the continuous and rainy days at night is also required. Battery capacity is too small to meet the needs of the night lighting, and the battery is too large, on the one hand, the battery is always in the state of loss of electricity, affecting the battery life, but also cause waste. Batteries should match solar cells and power consumption. A simple method can be used to determine the relationship between them. The power of solar cells must be more than 4 times higher than the load power, so the system can work normally. The voltage of the solar cell must exceed 20 to 30% of the working voltage of the battery, so as to ensure normal battery negative. The capacity of the battery must be 6 times higher than that of the load day.
4. Light source: What kind of light source for solar street lamps is an important indicator of the normal use of solar lamps, the general solar lamps use LED light source, low voltage energy saving lamp, low pressure sodium lamp and non pole lamp.
5. Lamppost: The height of the lamp post should be determined by the width of the road, the spacing between lamps and the illuminance of the road.
Related reading:100w Solar Led Street Light, High Power Solar Street Light
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