What are the advantages of solar LED street lights compared to AC led street lights? solar street light-li

1. Changing all street lights to solar street light can save the power generation of a Three Gorges Hydropower Station. LED solar street light is more energy-saving than high-pressure sodium lamps, and it has long been recognized by people. However, some quantitative concepts may still be lacking. It is now recognized that a 100-watt LED solar street light can replace a 250-watt high-pressure sodium lamp, so it can be simply considered that each LED solar street light can save 150 watts of electricity. However, if it is changed to solar power, even this 100W of electricity can be saved, which means that each street light can save 250 watts of electricity. According to estimates by relevant parties, the total number of street lamps in China is more than 100 million, and the annual growth rate is 20%. In 2008, 20 million street lamps were added. If these 100 million street lights can be converted into 60 million 250-watt street lights, and if these 60 million street lights are all changed to solar LED solar street lights, then a total of 15 million kilowatts of power can be saved. Assuming that each street lamp works 12 hours a day, 65.7 billion kWh of electricity will be saved in one year. The Three Gorges Hydropower Station in 2007 generated a total of 61.603 billion kWh of electricity. Therefore, the electricity saved by changing all the street lights in the country to solar street lights will exceed the annual power generation of a Three Gorges Hydropower Station. This is an extremely staggering number. Not only that, solar energy is a clean and renewable energy that not only saves electricity, but also reduces carbon dioxide emissions. Each 250-watt high-pressure sodium lamp will generate 1,290 kilograms of carbon dioxide within a year, so after all 60 million street lamps are converted to solar street lights, 77.4 million tons of carbon dioxide will be reduced. Therefore, after switching to solar energy, not only electricity bills are saved, but also the cost of carbon dioxide reduction. The abatement cost per ton of CO2 is $345-404. A reduction of 77.4 million tons of CO2 is equivalent to saving $31 billion in CO2 abatement costs! The previous numbers are just a comparison of LED solar street light and high pressure sodium lamps. For the same 100W LED solar street light, the energy saving comparison between AC and solar energy can be obtained by dividing the above data by 2.5. That is to say, 60 million 100-watt LED solar street lights, if all powered by solar energy, can save 26.28 billion kWh of electricity compared to when all AC power is used, and the carbon dioxide emission reduction cost is 12.4 billion US dollars. 2. The efficiency of AC power supply will be 15% lower than that of solar power supply. Because when using alternating current power supply, it must be converted into direct current by switching power supply. The efficiency of general switching power supply is about 80%. So for a 100W LED solar street light, the AC input power needs to be about 120W (120W is used in the comparison table below). When using solar power, as long as the DC/DC constant current source is used, its efficiency is as high as 95%. Therefore, the total efficiency of using alternating current is about 15% lower when combined. So the above figure should also be increased by 15%. 3. There are also power factor issues with AC power supplies. There is no power factor compensation in the relatively low-grade switching power supply. After a large number of applications, it will cause the overall efficiency of the power grid to decrease. 4. The main problem of using AC power supply is to reduce the life of the entire lamp because the AC power must be rectified and filtered to become DC power, so all switching power supplies must be filtered by electrolytic capacitors. As we all know, the lifespan of electrolytic capacitors is very low. The lifespan of general electrolytic capacitors is only 1000 hours, and the lifespan of long-life electrolytic capacitors is only 10,000 hours. Moreover, the lifespan is cut in half for every 10 degrees increase in ambient temperature. In high-power LED solar street light lamps, the temperature rise is very high, so the life of electrolytic capacitors is shorter. Usually, the life expectancy of LED solar street light is more than 50,000 hours. The life of the entire lamp will inevitably be dragged down by the short life of electrolytic capacitors. It can be considered that many low-quality LED solar street lights failed quickly in the past. In addition to accelerating the light decay due to the failure to deal with the heat dissipation problem of the LED itself, the failure of the electrolytic capacitors in the AC power supply is also an important factor. There are no electrolytic capacitors in solar powered systems. Therefore, the life of the constant current source can be guaranteed to match the life of the LED. 5. The overall cost of a solar cell powered LED solar street light is much lower than that of an AC powered LED solar street light system. Although the initial installation cost of solar street light is higher, the cost of cabling and long-term electricity bills for AC power supply is much higher than that of solar systems. 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