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In fact, motor vehicle traffic road illumination requirements to be higher than the above calculation results to many. To meet this requirement, the road expressway, trunk road and Welcome Road, leading to government agencies and large public buildings on the main road, downtown or commercial center, road lighting and other cities usually used by the 9-12 meter poles, 250-400W of sodium or metal halide lamp as a light source composed of lights, installed at intervals of 20-30 meters a street. If you work 12 hours a day, in accordance with the requirements of the design of the lights need to consume electricity 3-4.8KWH day. To illustrate the problem, and now we only require a minimum of computing a solar power solar street lighting for a motor vehicle road traffic.
1.1.2 ability to provide solar energy
Since the 1950s, since people began to use solar cell, its conversion efficiency has been constantly improved, the current commercialization of solar cell conversion efficiency of 17-18% has been achieved, the widespread use of solar cell conversion efficiency of 15%. Use this conversion efficiency of the solar cell, 1KW average every day how much power it can be made?
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This issue must be taken seriously. First, the number of solar cells produce electricity by solar cells receives solar radiation intensity of the decision, different locations, different time, different weather conditions, vary greatly, accurate calculation is more complicated, but not necessarily here this necessary. According to the amount of power in our country in recent years, Beijing, Shanghai and other places have done a solar power generation demonstration project announced by the statistics, the average daily per 1KW solar power generation in 1.7-3.5KWH, where most of the reports about 2.5KWH. Meanwhile, the Beijing Electric Division where construction of 25KW twin lakes in Tibet independent solar power station 3.2KWH, Trina Karma Township in Tibet independent 25KW solar power station construction is reported to be 5.9KWH. The above statistics shows that in Beijing, Shanghai and other places, the average daily solar cells per 1KW solar power generation capacity of about 2.5KWH, while in Tibet, can reach 3.2-5.9KWH. This is the ability of the solar cell to provide electrical energy.
Different products have different size and weight, dimensions
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1.1.3 solar cell current position in the field of road lighting
In addition to people's pursuit of environmental protection, the ability to light street lamps and solar cells provide electrical power requirements determines the current status of solar lighting in the area. If we design, "city road lighting design standards" in the ¡éñ, ¡é¨° type of road lamps, since the electricity in daily 3-4.8KWH, solar power needs to reach more than 1KW. Let us not consider the cost of 1KW solar cells, only on solar cell design work area will make it difficult to carry out. Currently, the solar cell area of ??120W / square meter, the solar cell area of ??about nine square meters 1KW, such a large area is almost impossible in the like rod fixed. Further, in order to meet the city in terms of continuous rainy days to work, but also to expand the capacity of the battery several times, it also requires a lot of battery box.
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Solar Light Manufacturers, Solar Lantern Manufacturers, Solar Lights China
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However, there are many manufacturers of solar lights do not agree with the above conclusion. They think that ordinary street using low-efficiency light source, as long as the light changed to energy-saving lamps or LED light source can be with a small electric power reached the national standards required illuminance, or by changing the method of optical design, with a small you can get a high flux of illuminance, so with a small solar power solar lights can be done successfully. This view is clearly defective, illuminance is the luminous flux per unit area, how could there be no flux illumination? To say the least, if there is such a possibility, street lighting is long overdue that a source of innovation. Also the market LED luminous efficiency is still much lower than the conventional sodium or metal halide lamp, or even more than capable and energy-saving lamps.
Identified in the above analysis, we believe that solar lighting in the area is currently only suitable for manufacturing "city road lighting design standards" in the branch and for pedestrians and non-motorized traffic in the residential area roads and sidewalks street, that is, we usually say street lights and garden lights. Sub-distributors lights do very reluctantly.
2 local conditions install solar street city
As there is no pollution of solar green energy, very suitable for use in road lighting, particularly areas without power or laying power lines difficult places.
Currently plaguing solar street in one of the major urban development is positioning error, blindly using the main roads in the road of urban roads, downtown or commercial center, major transport hubs and other locations, with the result that despite efforts, Since solar energy can offer is not yet able to meet the fast road, trunk road and Welcome Road illumination requirements, application of sola
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Solar photovoltaic lighting and mains complementary approach is a good way to solve ordinary solar photovoltaic lighting systems in urban areas there are mains application problems, especially in the original have been laying the city road lighting cables if you want to install solar lights, no not for a year and several consecutive rainy days are rare conditions and multiplied the capacity of batteries and solar cells, most of the time in a year it is a waste. In such cases, only we need to consider the longest hours of sunshine a year, and at night the lighting electricity demand required the shortest period of time on it, other energy, can supplement the mains. Thus, the solar cell efficiency to get the maximum use and minimum system cost battery capacity can be used a minimum, and solar street lighting system can achieve the highest reliability.
Therefore, the city had already laid on the road lighting cables if you want to install solar lights, solar photovoltaic lighting and mains complementary approach is a good way to local conditions.
Meanwhile, according to starting July 1, 2007 implementation of the "city road lighting design standards" CJJ45-2006 in Section 6.1.2
Enforce requirements article, the central square of the city must achieve dual power supply, solar photovoltaic power and mains complementary lighting can not say it is not a good way, in the city, some local dual power supply cost is very high solar photovoltaic power and mains complementary street lighting will significantly reduce the cost of dual power.
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