Unusual solar street lights in heavy rain

Recently, a report on the “July 21” heavy rain on Beijing TV caught the attention of the people of the country. After the storm, solar LED street lamps became the only source of illumination for the people. However, this kind of simple street light that people never care about played a huge role when people needed it most.

To mention photovoltaic power generation, people often think of a huge solar cell matrix. In fact, in the solar power system, independent power generation application systems are increasingly appearing in people's lives. This kind of solar street light system, which has played an important role in Beijing, does not rely on the urban power grid. Solar modules are used to directly convert light energy into electricity. The excess power is stored in the battery and released when it is cloudy.

According to Yingli Group engineer Feng Jinhe, an independent system such as a solar street light is more widely used in areas without electricity, electricity, or voltage instability. Household solar power generation system can provide household electricity to farmers and herdsmen in remote areas; Photovoltaic power-driven drip irrigation DC pumps solve the irrigation problems in areas with low electricity and drought; communications base stations in special regions such as tunnels and mountains, earthquake monitoring, On the ocean information extraction and other equipment, you can see the stand-alone photovoltaic power generation system. At present, there are dozens of applications for photovoltaic independent power generation systems.

With the advent of special weather and natural disasters, the unique advantages of this type of photovoltaic power generation are apparent. Due to the relative tightness of various components, and most severe weather tests such as strong winds, rainstorms, earthquakes, snow pressure, etc., were conducted during production, in the face of disasters, photovoltaic independent power generation products can often be safely passed, when the traditional power system When power is not available, these solar power plants can quickly restore power and become life-saving energy sources.

Because this type of power generation system has the characteristics of ready-to-use and random movement, it can be gradually promoted in disaster emergency response. In the earthquake disasters such as Wenchuan and Yushu, it was the photovoltaic independent power generation system that brought the light source to the disaster area so that the mobile phone resumed communication and allowed the computer to resume work.

The executive meeting of the State Council held on May 23 this year made it clear that new self-sufficient solar energy products, such as self-contained solar energy, will enter public facilities and households. It can be foreseen that the future application of solar energy independent power generation systems will become wider and wider. However, as far as the current level of technological development is concerned, such systems still have shortcomings. To give a simple example, current solar street lights are mainly used on roads that are 6 to 8 meters wide and are rarely used in arterial roads. According to the national road lighting standards, the power of street lamps for the main roads must be at least several hundred watts to over a kilowatt. At present, due to the limitation of the manufacturing process of photovoltaic modules, if such power is achieved, it is necessary to install a large battery panel on the street lamp, which is neither safe nor beautiful.

Because of the energy storage device, the cost of such a system is relatively high, the power generation is relatively small, and the energy density is relatively low. According to this feature, experts believe that due to the simple grid-connected technology of the developed grid, low cost, and high efficiency, large-scale use of solar independent power generation systems is not appropriate, but there are some power requirements such as bus stop signs and traffic lights. Little public facilities can still be applied. It seems that it is not difficult for such a new energy generation system to be selected for use.

Solar independent power generation system has a greater role in the vast rural areas. The voltage in rural areas in China is not very stable. Many remote areas lack electricity and electricity, and these areas are less sheltered and have rich solar energy resources. The advantages of photovoltaic independent power generation systems can be fully utilized.