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Analysis of solar LED street lamp

The overall cost of high-power LED street lamps powered by solar cells is much lower than that of high-power LED street lamps powered by alternating current.

Although the initial installation cost of solar LED street lamps is high, the cable laying cost and long-term electricity expenditure of AC power supply are much higher than that of solar system.

Let's analyze it in detail.

1. The cost of LED lamp holder and lamp pole of the two systems is basically the same, and the main difference is the solar panel. Usually, the power of solar panels is about three times that of LED lamps. If the LED is100W, a 300W solar panel is needed. At present, the price of solar panels has dropped to 23 yuan/watt, and 300 watts is 6900 yuan. In addition, solar energy system also needs storage battery, but its cost is equivalent to the cost of switching power supply in AC power supply. So the two can cancel each other out. Therefore, the difference in the cost of lamps themselves is mainly solar panels.

2. The biggest expenditure of AC-powered high-power LED street lamps during initial installation is the laying of cables.

Most people think that the main cost is the cable itself, but except the cable itself, its laying and auxiliary facilities (inspection wells, power distribution equipment) are much more expensive than the cable itself. Now let's assume that a road with a length of 10 km needs 666 high-power LED street lamps every 30 meters. If you use solar street lamps, you can save 430,000 yuan in electricity charges in five years, and 6,543,800 yuan+0.22 million yuan in electricity charges every year after five years.

The solar high-power LED street lamp does not have the above shortcomings at all, and its composition is very simple, consisting of only five parts: and its installation is very simple, as long as a cement base is made, the lamp pole is erected, and the anchor screws are installed, especially the personnel of the power system are not required to design, install and construct, dig trenches, lay cables, dig manholes, install transformers, and so on. This is a very important advantage.

Lead-acid batteries in solar high-power LED street lamps are a problem. On the one hand, its life is a problem. Generally, the life of lead-acid battery is only 2 years, but now there is a kind of winding lead-acid battery with a life as high as 6-8 years. It's just a little expensive.

Another problem of lead-acid batteries is environmental pollution. In fact, the biggest user of lead-acid batteries is cars. China now produces and sells 7 million cars every year, and each car uses at least one lead-acid battery. For a long time, there has been a very complete recycling system for automobile lead batteries, in which lead plates will be recycled. Therefore, the lead battery in the solar LED street lamp system can be completely recovered by using the existing automobile battery recovery system, which will not cause environmental pollution. Moreover, the cost of lithium iron battery has been reduced to the point of practical use. This is a completely pollution-free battery, and now there are also lithium iron batteries instead of lead batteries for electric bicycles. A company producing high-power solar LED street lamps in Taiwan Province Province has developed street lamps using lithium iron batteries. Dongguan already has factories producing lithium-iron automobile batteries. It can be guaranteed for five years. So this problem can also be solved.

At present, the only problem of solar street lamps is the cost of solar panels, but at present, its price is falling at an alarming rate. The last time was in 2008, the price was reduced by 1/3. The price of its main raw material polysilicon has dropped from $300 per kilogram in 2007 to $200 per kilogram in 2008. It is predicted that the price of polysilicon will drop to $65,438+000 per kilogram in 2009. In particular, the output of polysilicon in China has increased rapidly. After all the 33 projects under construction are put into production, their output will reach146,000 tons, while the current domestic demand is only 8,000 tons. Therefore, how to expand domestic demand is a top priority. Developing solar high-power LED street lamps is undoubtedly the best way. At present, the price of solar panels has dropped to 20 yuan/watt. And it is still decreasing at an extremely fast rate.

In addition, using PWM dimming controller and PWM dimming constant current drive module is also an effective way to reduce the area of solar panels. As shown in the following figure, after adopting PWM dimming control, energy can be saved by more than 40%, that is to say, the area of solar panels can be reduced by 40%. This undoubtedly greatly reduces the cost of solar high-power LED street lamps. Make it more competitive than AC high-power LED street lamps!

Replacing all street lamps with solar street lamps can save the power generation of a Three Gorges hydropower station.

It has long been recognized that high-power LED street lamps are more energy-saving than high-pressure sodium lamps. However, some quantitative concepts may still be lacking. Now we can think that 100W high-power LED street lamp can replace 250W high-pressure sodium lamp, so we can simply think that each high-power LED street lamp can save electricity 150W.

But if you switch to solar power generation, you can even save 100W, which means that each street lamp can save 250w. According to the estimation of relevant parties, the total number of existing street lamps in China is about 1 100 million, increasing by 20% every year. In 2008, 20 million high-power LED street lamps were added. If this 1 100 million street lamp can be converted into 60 million 250-watt street lamps, if all these 60 million street lamps are converted into solar high-power LED street lamps, then a total of * * * can save 65.438+0.5 million kilowatts of electricity. Assuming that each street lamp works for 12 hours every day, 1 year can save 65.7 billion kwh. The total output of Three Gorges Hydropower Station in 2007 was 61603 million kWh. Therefore, after all the street lamps in the country are replaced by solar street lamps, the electricity saved in one year will exceed the annual power generation of a Three Gorges hydropower station. This is an extremely amazing number. Even if the original street lamps are not rebuilt, about 20 million street lamps will be added every year, and it will reach 60 million in three years. With the same calculation, a Three Gorges power station can be saved in three years. It does not need to mobilize the national strength, invest hundreds of billions, and immigrate millions.

Moreover, solar energy is a clean and renewable energy source, which not only saves electric energy, but also reduces carbon dioxide emissions. Each 250-watt high-pressure sodium lamp will produce 1290 kg of carbon dioxide in one year, so after all 60 million street lamps are replaced by solar street lamps, 77.4 million tons of carbon dioxide will be reduced. So after switching to solar energy, it not only saves electricity, but also saves the cost of reducing carbon dioxide. The cost of reducing carbon dioxide per ton is $ 345-404. Reducing 77.4 million tons of carbon dioxide is equivalent to saving 3 1 billion dollars in carbon dioxide emission reduction costs!

The previous figures are only the comparison between high-power LED street lamps and high-pressure sodium lamps. For the same size 100W high-power LED street lamp, just divide the above data by 2.5, and you can get the energy-saving comparison between AC and solar energy. That is to say, if 60 million lamps100W high-power LED street lamps are all powered by solar energy, they can save 26.28 billion kWh of electricity compared with all AC power supply, and the cost of reducing carbon dioxide is124 billion US dollars.