Development status of solar LED street lamp in China

LEDinside participated in the third international new light source and new energy forum, select a few more important issues, to share the content of the participants to the LED industry.

The following is the speech is delivered by Mr. Wang Guohua, he is the deputy director of the Institute of new energy China lighting lighting Specialized Committee, and also served as general manager of Beijing gaokeneng Photoelectric Technology Co., ltd..

Development status of solar LED street lamp in China

For the first time in the Yangzhou light industry conference, I do a technical report, is the main method of the design of solar energy; the second time, third time today, we are making an economic analysis of the cost reduction of the solar system. So, at present, the main problem is the high cost of solar LED street lamp. I want to put forward a new design idea in my content. As we all know, no matter where on the one hand, it should guarantee the correctness of the requirements, one is to ensure eight hours of work, another is a rainy day, shelf life is three years, and the light curve is 10% per year, according to the basic requirements of the luminous flux is less than 30% us. How to ensure the basic implementation of the configuration, according to the theory and practice of a large number of data, summing up the experience, in the northern region is 4, in the Tibet area of Qinghai is 3, is said to have your power and your battery. For this battery and controller, there is a proportional relationship between them, then I would like to come to the next conclusion.

Here, we now come up with the focus of this contradiction is that the power of the light source determines the solar system architecture. For example, like our typical configuration, only this configuration can meet five rainy days and every day for eight hours, all of which it is the sun and this is basically 1:4. So the battery is controlled by 10. This is so tender directly out of the fight, so we can see the power regulator | supply cost per Watt Solar is in 320~346 yuan, because the price is 4800~5200 yuan per set (07~08 year Beijing City bidding price).

How to reduce the cost and how to reduce the cost. There are only three ways. The first way is to optimize the design to improve efficiency, the second way is to change the configuration to reduce costs. Third is to improve the efficiency of light power.

One by one solution to reduce the cost of feasibility

1 the first is the optimal design. For solar cells, from 1980 ~2005, its efficiency is also increased by 3~4%. So it improves the space is very small, so below, regardless of whether it is crystal silicon, polycrystalline silicon or silicon, is the basic information, I said this is civil efficiency, and efficiency is not the battery plate, China can reach 14% is not much, that is to say the increased space, I expect 1~2% is 3 years, can achieve good 15~16%. For the efficiency of the controller, the domestic good has reached 0.975, foreign is about 96%, the last two years to improve the space is only 2~3%, can not be 99%, 100%. For the efficiency of lamps, we have been engaged in solar lights, especially solar power is small power, 50W or less. It is actually the efficiency of sodium, we have tested, 50W is made of sodium lamp, which is 60~70%, and the high pressure lamp and energy-saving lamp metal halide lamp, because they are energy resolution electronic device, bad words are mostly electronic resolution device in bad, LED lamp with the light we are except. In other words, you want to improve the efficiency of the device, in the near future is impossible.

2 so for a number of low-cost configuration, when we are in the process of acceptance of the project encountered. One is the low cost of resources, solar cell configuration is reasonable, but the experimental value is very small, so when you leave the lighting, that is, the storage part is very small, less than eight hours a day lighting. The second program is a small solar cell, the control of the battery is also small, he can not guarantee you every day. The third aspect is the solar cell is small, the battery is big, this is purely steals the Jin to reduce two. Although the first 10 days to ensure that all the day does not generate electricity are shiny, but in fact is the use of battery power. The fourth is a high power configuration is low, although the light is bright, but you can not guarantee that is eight hours, so we concluded that any change in the configuration can not guarantee the quality of lighting time.

3 so we look back, that is, the space of the system design is very small, and a low cost control affect the quality of conventional light source will be improved over the past two or three years. So I came to the conclusion that using conventional technology to reduce the cost of solar energy systems. So what is our design idea? We are to improve the efficiency of light, that is, I just said the third program. Improve the efficiency of light is equal to reduce power, reduce power is equivalent to reduce costs, so improve the efficiency of LED light is another way to reduce costs. Because we look from the network engineering, based on the 70 lm/w, LED light efficiency increased by 15%, solar energy costs can be reduced by 10%. It improve the efficiency of light in the system, I think the impact is not big, why not, because the lighting quality is not reduced, the total amount of CD-ROM almost, but significantly reduce the cost of solar battery, battery, less maintenance, support, all in the lower panels. So efficient LED increase costs I just forget, as long as you control, it is in the total cost of 10%~15%, why do you say that your high efficiency, your LED is not