Introduction to solar led street light relative to the led street light the advantages of shanxi communication

1. All lights instead of solar street lights can save one of the three gorges hydropower station power LED street light than the high-pressure sodium lamp and energy saving, has long been recognized. But may also lack some quantitative concept. Now recognized as 100 watts of the LED street lamp can replace high 250 watts of

1. Replace all lamps with solar street lights can save power LED street light for the three gorges hydropower station is more energy-saving than high pressure sodium lamp, high-pressure sodium lamp is already known. However, some may still lack of quantitative concept. Now recognized 100 watts of led street lamps can replace 250 w high pressure sodium lamp, so you can simply assume that each led street lamp can save 150 watts of electricity. However, if the switch to solar power, can even save 100 watts of electricity, every street lamp can save 250 watts of power. According to estimates, China's existing lamps total more than 100 million, annual growth rate of 20%, 20 million new street light, and in 2008. If 100 million streetlights were transformed into 60 million 250 - watt lamps, if the 60 million streetlights all converted into solar led street lamp, can save a total of 15 million kilowatts of electricity. Assuming each street lamp to work 12 hours a day, a year will save 65. 7 billion kilowatt hours of electricity. However, the total generating capacity of the three gorges hydropower station in 2007 to 616. 0. 3 billion KWH. Therefore, all across the country, the street lamp to save electricity solar street lamps will be more than the annual output of the three gorges hydropower station. This is a very astonishing Numbers. In addition, the solar energy is a clean renewable energy, not only saves electricity, also cut carbon dioxide emissions. 250 watts of high pressure sodium lamp lights will produce 1290 kg of co2 in a year, therefore, in all 60 million streetlights after conversion to solar street light, will reduce 77. 4 million tons of carbon dioxide. After conversion to solar energy, therefore, not only can save electricity, also can save cost of carbon dioxide emissions. Cost per tonne of carbon dioxide emissions is 345 - 404 dollars. Reduction of 77. 4 million tons of carbon dioxide emissions of carbon dioxide equivalent to save $31 billion cost! Digital is just in front of the LED street lamp and the comparison between high pressure sodium lamp. For the same 100 - watt led lights, communication, and solar energy is simply the data divided by 2. 5. In other words, if all the 60 million 100 watts of led street lamp is powered by solar energy, compared with all the ac power, would save $262. 800 million kilowatt-hours of electricity, reduce the cost of carbon emissions for 12. 4 billion dollars. 2. The efficiency of ac power will be 15% lower than solar power. Because when use ac power, must use the switch power supply converts it to DC. General switch power efficiency is about 80%. Therefore, for a 100 - watt led street lamps, the ac input power requires about 120 watts ( Use is 120 watts) in the table below 。 However, when the solar energy is used for power supply, as long as the use of DC/DC constant current source, efficiency can reach 95%. Therefore, the use of alternating current (ac) the overall efficiency of about 15% lower. Therefore, the figures should be increased by 15%. 3. The power factor in ac power. The relatively low levels of reactive power compensation switch power supply is not. After a large number of applications, the overall efficiency of the grid would be reduced. 4. The main problem with the ac power is to reduce the life of the lamp. Because of alternating current must pass through rectifier and filter to become a direct current, so must be used in all switch power supply filtering electrolytic capacitor. As is known to all, the service life of the electrolytic capacitor is very low, generally only 1000 hours service life of the electrolytic capacitor, long-term use of the service life of the electrolytic capacitor is only 10000 hours. In addition, the temperature rise every 10 degrees, life will be shorten half. Power leds lamps of high temperature and short service life of the electrolytic capacitor. However, the life of the led street lamp usually requires more than 50000 hours. Life is short, electrolytic capacitor will reduce the life of the lamp. Can be thought of, in the past, many low quality led street light soon failed. In addition to the failure to properly handle the heat dissipation of light emitting diode itself and accelerate the light attenuation, electrolytic capacitor in the ac power source fault is also an important factor. However, there is no electrolytic capacitor in solar energy power supply system. Therefore, the service life of the constant current source can ensure that match the service life of the light emitting diode.