Solar street lights and other street light solutions using advanced solar technology

Design of solar street lamp

Core Tip: This article describes the composition of sunlight, the analysis of each part of the operating principle, work characteristics, the analysis of solar LED street light environment and use of technical requirements associated . Raised in the suburban road, slide the use of environment-saving street lamps LED solar energy is a trend in the lighting of the road.

I. Introduction

As the Earth's resources become increasingly scarce, the risk that the cost of investment in basic energy to increase, and a variety of safety and pollution are everywhere, solar energy security as a " endless, renewable energy EnvironmentalNew increasing attention. At the same time, along with the development of photovoltaic technology and the progress of solar lighting products, the double advantage of green energy saving street lamp solar energy lawn lamp, garden light, etc. The application has to scale solar lighting in the area of development has become ever more perfect. The experience of the writer of sunlight designed to reference couples.

Second, the composition of sunlight from the street

The sunlight from the street into the following components: solar panels, solar controller, battery, light source, light poles and housing. Set the output of the power supply AC 220V or 110V, but the converter.

1, the solar panels:

Solar panels solar street light in the central part of the value of solar energy in the highest part of the street. Its function is to convert solar radiation into electricity stored in batteries or sent to them. Among the many solar cells are more frequent and more useful are the cells of mono-crystalline silicon, polycrystalline silicon solar cells and three types of amorphous silicon solar. A lot of sun in the sun for good eastern and western parts, using polycrystalline silicon solar cells and polycrystalline silicon production process of solar cells is relatively simple, lower price than the single crystal. In cells cloudy and rainy days are but the sun is not very abundant in southern areas, and solar energy using single crystal silicon and monocrystalline silicon performance parameters of solar cells are stable. The amorphous silicon solar cells in the absence of sufficient sunlight outdoors, the better, because the amorphous silicon solar cells on solar illumination conditions that require relatively low.

2, Solar Controller

No matter the size of the sunlight, a good performance of charge-discharge controller is essential. To prolong battery life, the loading condition of the discharge should be limited to prevent overloading of the battery and the depth of the load. Most of the temperature difference between the function that the controller should have qualified temperature compensation. Driver sunlight of the street, while the control functions should be combined with light control, the control function of time, and must be controlled auto-cut-night feature, the easy days rain to extend the time working on the street.

3 Battery

As the solar PV system, the input energy is very unstable and therefore usually need to configure your system battery for the job. They are usually lead-acid batteries, rechargeable Ni-Cd, Ni-H. The choice of battery capacity, in general, should follow the following principles: first, to comply with the lighting at night under the premise of the components of days of storage of solar energy by as much as possible, while capable of storing consecutive days of rain, nighttime lighting to meet energy needs. A capacidade da bateria não é muito pequeno be able to satisfazer as necessidades de iluminação noturna, é muito armazenamento pots large, enquanto a bateria em semper state is losing, afetado to give battery life, no wastage of tempo. Batteries should be solar cells, light electrical load () to match. It is a simple way to determine the relationships between them. Solar energy is four times the power load on the system to function properly. Solar cell voltage exceeds the battery voltage should be 20 ~ 30% to ensure the normal load on the battery negative. The battery capacity must be more than six times the load of high consumption and more.

4 light sources,

Street light solar street lights ill be an important indicator of normal use, the overall use of sunlight, saving lamps, low voltage, discharge lamps, sodium lamps, low pressure DLED source.

(1) the low voltage energy saving lamps: power is small, the efficiency of light is greater, but the life of 2,000 hours, low voltage lamp black, in general, solar lawn lamp and patio.

(2) lamps Low pressure sodium lamps, low pressure sodium, high efficiency (up 200LM / w) as the inverter, lamp low pressure sodium expensive, the whole system, very high, with less.

(3) discharge lamps: power is small, light and efficient. Lamps 220 V (pure sine wave, frequency 50 Hz) in normal usage of electricity, life can reach 5 million hours of sunlight in the lives of small businesses and the total energy as light bulbs (a Because of sunlamps are an investor of the square wave devices, providing the output frequency of 220 solar, Xiang-bit, the tension can not be compared and electricity of the city in general).

(4) LED: LED light source, long life, up to 1 million hours working voltage is low, do not drive, a high luminous efficiency, internal 50 lm / W, the import of 80 lm / W. With the advance of technology, the performance of LED's, will be strengthened. I think solar LED lamp as light source will be a trend.

5, the poles and lamp

The height of the posts should be based on the width of the road, spacing of the lamp, the normal lighting of the road fixing. Lamp housing, according to our collection of solar lights a number of foreign intelligence, between aesthetics and efficiency, most are choosing energy saving bulbs look less demanding, the relative utility to do.

3, solar lamp design experience of the street

1, the illumination of the road and extent of

According to the roadmap urban lighting design standards "requirement: fast path average intensity of 20lx, uniformity of 0.4, the roads, an average intensity of 15lx, uniformity of 0.35, sub-distributors 8LX average intensity, uniformity of 0.35, an average intensity of slip 5LX, uniformity of 0.3. LED lights are put in use due to technical conditions, the power LED 30 ~ 100W very small, the light output 50 ~ 80lx / w, the lowest illumination of the road, the author tried, rod 8.5 meters , 30 yards, 2 × light source 50wLED Lamps, lighting the lamp 19lx, between the two lights 11lx, the darker 3.5lx.

Above, to install lights for the new value of the initial lighting, so the lighting is not the easiest way to find and roads. Sunlight if the sub-distributors, the use of road transport, the main street with caution.

2 time lighting

LED hours of work must be with the general working conditions of the street, the project should consider the short duration of sunlight in winter, hours of work must be capable of more than 12 hours. Because LED lights affected by climate change in case of rainy days in a row, so the lack of power LED lamps could not be used. Those countries are not normative for low irradiance LED bulbs (continuous overcast and rainy day) with a minimum hours of work does not provide for lighting manufacturers and is usually based on local weather conditions must be in the low irradiance (continuous overcast and rainy days) of working conditions in the 15 ~ 20 days. Should be fully taken into account in the design of solar panels and battery capacity.

3, grounding lightning protection

Voltage LED street lamp is functioning normally 12V or 24V, is a safe voltage will not enable the protection of electrical grounding. However, the positions of metal LED lights to do lightning ground, the grounding resistance of less than 10 ohms.

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