When you walking outside, you will often see solar street lights used as lighting tools on both sides of the road. However, from the appearance point of view, you will not see the battery with energy storage, you can only see the solar panels that collect solar energy, but at night, the energy of the energy storage battery will be used to provide power to the street lights and illuminate the road conditions. Therefore, when we understand solar street lights, we also need to know the type of energy storage battery and its installation and anti-theft.
Types of energy storage batteries for solar street lights
Solar photovoltaic power generation systems use solar cells made by the photovoltaic effect principle to directly convert solar energy into electricity. A solar cell is the smallest unit used for photoelectric conversion. Its size is about 4 square centimeters to 100 square centimeters. The working voltage of the solar battery cell is 0.45 to 0.50 volts, and generally cannot be used alone as a power source. After the Shanneng battery cells are connected in series, connected in parallel and packaged, they become solar cell modules. Its power ranges from a few watts to several hundred watts, and can be used alone as a power source. The solar cells are then connected in series, connected in parallel, and mounted on a support to form a square array of solar cells. It can output several hundred watts, where kilowatts or more, and is a power generator for photovoltaic power stations. The commonly used solar cells are mainly silicon solar cells. There are currently three commercially available silicon solar cells in the world: monocrystalline silicon solar cells, polycrystalline silicon solar cells, and amorphous silicon solar cells.
Monocrystalline silicon solar cell is currently the fastest developed solar cell. Its structure and production process have been finalized, and its products have been widely used in space and ground. This solar cell uses high-purity single-crystal silicon rods as raw materials and requires a purity of 99.999%. In order to reduce production costs, solar cells and other monocrystalline silicon rods are currently used in ground applications, and the material performance indicators have been relaxed.
Monocrystalline silicon solar cells have the highest manufacturing costs, but also have the highest photoelectric conversion efficiency, with the highest reaching 24%. Most of the polycrystalline silicon materials used in polycrystalline silicon solar cells are aggregates containing a large number of single crystal particles, or are melt-cast from waste single-crystalline silicon materials and metallurgical grade silicon materials, and then injected into the graphite mold, which will slowly solidify and cool down.
To obtain polycrystalline silicon ingots. This silicon ingot can be cast into cubes for slicing and processing into square solar cells, which can improve material utilization and facilitate assembly. The manufacturing process of polycrystalline silicon solar cells is similar to that of single crystal silicon solar cells. Its photoelectric conversion efficiency is about 12%, which is slightly lower than that of single crystal silicon solar cells. However, its material is simple to manufacture, saves power consumption, and has a lower total production cost. A lot of development.
Battery installation and anti-theft
In order to ensure the service life of the battery and theft prevention, according to the local ground temperature data, the battery is first placed in a special moisture-proof buried box, and then placed in a cement pool at a depth of 1.2 meters (the clear height of the cement pool is 0.5 meters). The surface is covered with a 5CM cement prefabricated board. Finally, the cement board steel bar and the light pole base steel bar are welded, filled with soil and compacted.