Wholesale Solar Street Lamps are powered by crystalline silicon solar cells. Maintenance-free valve-regulated sealed batteries (gel batteries) store electric energy. Ultra bright LED lamps are used as light sources and controlled by intelligent charge-discharge controllers to replace traditional public power lighting Wholesale Solar Street Lamps.

Introduction of Solar Energy

Solar energy of Wholesale Solar Street Lamps using is an inexhaustible, clean, pollution-free, and renewable green energy. Solar power generation has incomparable advantages over other conventional energy sources, such as cleanness, high security, relative universality and sufficiency of energy, long life,e, and maintenance free. Photovoltaic energy is considered to be the most important new energy in the 21st century.

Solar Wholesale Solar Street Lamps do not need to lay cables, AC power supply and electricity charges; or DC power supply, and control; The utility model has the advantages of good stability, long service life, high luminous efficiency, simple installation and maintenance, high safety performance, energy conservation, environmental protection, economy, and practicality.

It can be widely used in urban main and secondary roads, residential areas, factories, tourist attractions, parking lots, and other places. The lamp pole structure of the product part: steel lamp pole and bracket, the surface is sprayed with plastic, and the battery board is connected with special anti-theft stainless steel screws.

System Composition

Solar street lamp systems can ensure normal operation in rainy weather for more than 15 days! Its system is composed of an LED light source (including drive), solar panel, battery (including battery incubator), solar street lamp controller, street lamp pole (including foundation), and auxiliary materials and wires.

Monocrystalline silicon or polycrystalline silicon solar cell modules are generally selected as solar cell modules; High power LED light source is generally selected for the LED lamp head; The controller is generally placed in the lamp pole, with light control, time control, overcharge, and over-discharge protection and reverse connection protection.

The more advanced controller has the function of adjusting the lighting time in four seasons, half power function, intelligent charging and discharging function, etc; The storage battery is generally placed underground or there will be a special storage battery incubator. Valve-regulated lead acid battery, gel battery, iron aluminum battery, or lithium battery can be used. The solar lamp works automatically, without trenching and wiring, but the lamp pole needs to be installed on the embedded parts (concrete base).

Wholesale Solar Street Lamps LED light source

1. High luminous efficiency, low power consumption, long service life, and low operating temperature.
2. Strong safety and reliability.
3. Fast reaction speed, small unit size, green and environmental protection.
4. At the same brightness, the power consumption is one-tenth of that of incandescent lamps, one-third of that of fluorescent lamps, while the service life is 50 times that of incandescent lamps and 20 times that of fluorescent lamps. It is the fourth generation of lighting products after incandescent lamps, fluorescent lamps, and gas discharge lamps.
5. The advent of a single high-power super bright LED makes it possible for LED applications to cross into the market of high-efficiency lighting sources and will be one of the greatest inventions of mankind after Edison invents incandescent lamps.

Battery module bracket

1. Inclination design

To make the solar cell modules receive as much solar radiation energy as possible in a year, we should choose an optimal tilt angle for the solar cell modules.

The discussion on the optimal tilt angle of solar cell modules, which are used in different regions, depends on different regions.

2. Wind-resistant design

In the Wholesale Solar Street Lamps system, wind resistance design is a very important problem in the structure. The wind resistance design is mainly divided into two parts, one is the wind resistance design of the battery module bracket, and the other is the wind resistance design of the lamp pole. The following two parts are analyzed respectively.\

1)Wind resistance design of solar cell module support

According to the technical parameters of the battery module manufacturer, the upwind pressure that the solar module can withstand is 2700Pa. If the wind resistance coefficient is selected as 27m/s (equivalent to a Category 10 typhoon), the wind pressure borne by the battery module is only 365Pa according to nonviscous hydrodynamics. Therefore, the component itself can withstand 27m/s wind speed without damage. Therefore, the key consideration in the design is the connection between the battery module bracket and the lamp pole.

In the design of this street lamp system, the connection between the battery module bracket and the lamp pole is designed to be fixed with a bolt pole.

2)Wind resistance design of street lamp pole

The parameters of Wholesale Solar Street Lamps are as follows:

Panel inclination A=16o Pole height=5m

The width of the welding seam at the bottom of the lamp pole is selected for design δ =  4mm pole bottom OD=168mm

The surface where the weld is located is the failure surface of the lamp pole. The distance from the calculation point P of the resistance moment W of the pole failure surface to the action line of the load F of the battery panel on the pole is

PQ = [5000+（168+6）/tan16o] ×  Sin16o = 1545mm=1.545m。 Therefore, the acting moment of wind load on the failure surface of the pole M=F × 1.545。

According to the design maximum allowable wind speed of 27m/s, 2 × The basic load of a 30W double head solar street lamp panel is 730N. Considering the safety factor of 1.3, F=1.3 × 730 = 949N。

So, M=F × 1.545 = 949 × 1.545 = 1466N.m。

According to mathematical derivation, the resistance moment of the toroidal failure surface W=π × （3r2 δ+ 3r δ 2+ δ 3）。

Where r is the inner diameter of the ring, δ Is the width of the ring.

Resistance moment of failure surface W=π × （3r2 δ+ 3r δ 2+ δ 3）

=π × （3 × eight hundred and forty-two × 4+3 × eighty-four × 42+43）= 88768mm3

=88.768 × 10－6 m3

Stress caused by action moment of wind load on failure surface=M/W

= 1466/（88.768 × 10－6） =16.5 × 106pa =16.5 Mpa<<215Mpa

Among them, 215 Mpa is the bending strength of Q235 steel.

Therefore, the weld width selected in the design meets the requirements. As long as the welding quality can be guaranteed, the wind resistance of the lamp pole is no problem.

Controller

The main function of the solar charging and discharging controller of Wholesale Solar Street Lamps is to protect the battery. The basic functions must include overcharge protection, over-discharge protection, optical control, time control, anti-reverse connection, charging trickle protection, under-voltage protection, waterproof protection, etc.  [1]

1) Device selection

In the selection of devices, some devices use single-chip, and some devices use comparators. There are many schemes, each with its characteristics and advantages. The corresponding scheme should be selected according to the needs and characteristics of the customer group, which will not be detailed here.

2) Surface treatment

This series of products adopt new electrostatic coating technology, mainly FP professional building materials coating, which can meet customers’ requirements for product surface color and environmental coordination. At the same time, the products have high self-cleaning properties, strong corrosion resistance, and aging resistance, and are suitable for any climatic environment. The processing technology is designed to be coated based on hot-dip galvanizing, which greatly improves the product performance, meeting the most stringent requirements of AAMA2605.2005, and other indicators that have met or exceeded the relevant requirements of GB.

3) Charging trickle protection

When the battery is charged by Yijia solar panel, if the battery continues to be charged under high voltage after reaching the peak voltage, it is easy to cause water loss or loss of control of the battery; If the charging is stopped, the battery cannot be saturated. This controller drops 1V immediately after charging to the peak voltage, and then enters the trickle charging state, which ensures that the battery can be stabilized in a full state while avoiding water loss or loss of control. It is similar to the cycle charging of the battery, which not only effectively protects the battery, but also improves the charging times of the battery, and has a longer service life.

Wholesale Solar Street Lampes working principle

Description of the working principle of the Wholesale Solar Street Lamps: under the control of the intelligent controller in the daytime, the solar cell panel absorbs the solar light and converts it into electric energy through the sunlight, the solar cell module charges the battery pack in the daytime, and the battery pack supplies power to Wholesale Solar Street Lamps source at night to achieve the lighting function.

The DC controller can ensure that the battery pack will not be damaged due to overcharge or over-discharge, and has the functions of light control, time control, temperature compensation, lightning protection, reverse polarity protection, etc.

Product parameters

Main material: the lamp pole is of full steel structure, and the whole body is hot-dip galvanized/sprayed with plastic

*Solar cell module: crystalline silicon 15-80WP (configured according to load)

*System working voltage: DC 12V-24V

*Controller: special controller for solar lamps, light control+time control, intelligent control (lights turn on automatically in the dark, lights turn off in the morning)

*Energy storage battery: enclosed maintenance-free lead-acid battery 12V17Ah-80Ah (configured according to load)

*Light source type: energy-saving high-power integrated LED, rare earth high-efficiency energy-saving lamp (can be configured according to customer requirements)

*Protection grade: IP65

*Operating temperature: – 30 ℃ to 70 ℃, wind resistance ≥ 150Km/h

*Lighting time: 4~14 hours (adjustable as required)

*Lamp pole height: 2m~4m (can be made according to customer requirements)

*Continuous operation on rainy days (can be made according to customer requirements)

There is no need to lay underground cables for solar Wholesale Solar Street Lamps and pay for Wholesale Solar Street Lamp’s electricity. The key components of solar garden lamps, such as solar panels, solar DC street lamp intelligent controllers, maintenance-free batteries, and lighting lamps, have been certified by the National Development and Reform Commission/GEF/World Bank as photovoltaic products. It is mainly applicable to the lighting of urban roads, community squares, industrial parks, tourist attractions, parks, and green belts.

Technical advantages

1. Simple installation: When installing the solar street lamp, it is not necessary to set up complex lines, but only to make a cement base and a battery pit, which can be fixed with galvanized bolts. There is no need to consume a lot of manpower, material resources, and financial resources. The installation is simple, and there is no need for stringing or “opening the belly” to dig the ground, and there is no concern about power cuts.

2. Less investment: solar Wholesale Solar Street Lampswill benefit from one-time investment and long-term benefits. Because of the simple lines, there will be no maintenance costs and no expensive electricity charges. The cost will be recovered in 6-7 years, and more than 1 million electricity and maintenance costs will be saved in 3-4 years. It can save the high electricity cost of city circuit lights, complex lines, and the need for long-term uninterrupted maintenance of lines. Especially when the voltage is unstable, the sodium lamp is inevitably easy to break. With the extension of the service life, line aging and maintenance costs are increasing year by year.

3. Good safety performance: The solar street lamp is an ideal product for the ecological community and the road administration department because of its low voltage of 12-24V, stable voltage, reliable operation, and no potential safety hazard. No electric shock, fire, or other accidents. There are many hidden dangers in the safety of municipal circuit lights, people’s living environment is changing constantly, road reconstruction, landscape engineering construction, abnormal power supply, cross construction of water and gas pipelines, and other aspects bring many hidden dangers.

4. Energy conservation and environmental protection: provide electric energy with solar photovoltaic conversion, which is inexhaustible. No pollution, noise, or radiation. Solar Wholesale Solar Street Lampscan adds new selling points for the development and promotion of noble ecological communities; Continuously reduces property management costs and reduces the expenses shared by owners. To sum up, the inherent characteristics of solar lighting, such as safety without hidden danger, energy saving and consumption free, green and environmental protection, simple installation, automatic control and maintenance free, will directly bring obvious advantages to the sales of buildings and the construction of municipal projects.

5. Long service life: the service life of solar lamps is much higher than that of ordinary electric lamps, for example, the service life of the main components of solar lamps —- solar cell modules is 25 years; The average service life of low-pressure sodium lamp is 18000 hours; The average service life of low voltage high-efficiency tri-color energy-saving lamp is 6000 hours; The average life of super bright LED is more than 50000 hours.

The service life of the special solar battery is 2-5 years below 38AH; 3-7 years from 38-150AH. The product has a high scientific and technological content. The control system and accessories are of an international brand, intelligent design, and reliable quality. According to the regulation of the local price bureau that “the maintenance fee of Wholesale Solar Street Lampsin the community is 6 yuan/m2 based on the pure residential building area”, the initial investment of ordinary lamps is much higher than that of solar lamps. In a word, by comprehensive comparison, the investment saving characteristics of solar lamps are quite obvious.

In the solar power Wholesale Solar Street Lamps system, the performance of the battery directly affects the comprehensive cost, operation, and service life of the system. In this scheme, the latest energy storage gel battery jointly developed by the company and the Institute of Metals, Chinese Academy of Sciences is selected. Compared with ordinary lead-acid batteries, it has the following outstanding characteristics in the design and manufacturing process:

The service life is very long, which is five to ten years under normal conditions.

Suitable positive and negative electrode alloy formulas and active material ratios are adopted to make the battery more suitable for the use characteristics of cyclic charging and discharging of the energy storage batteries.

The design of colloidal electrolytes can effectively inhibit of active substances and the sulfation of plates, thus delaying the degradation of battery performance during use. The deep charge-discharge cycle life of the battery is greatly improved. The fourth generation lighting Wholesale Solar Street Lamps source is selected.

Problems

With the increasing shortage of traditional energy, the application of solar energy that Wholesale Solar Street Lamps use will be more and more extensive, especially in the field of solar power generation, which has developed into a mature sunrise industry in just a few years.

At present, one of the most important factors restricting the application of solar power generation is the price. Taking a two-way solar street lamp as an example, the total load of the two circuits is 60 watts (calculated by taking the effective light in the middle and lower reaches of the Yangtze River as 4.5h/day, discharging for 7 hours every night, and increasing the reserved amount of the battery panel by 20%). Its battery panel needs about 160 watts. If calculated by 4 yuan per watt, the cost of the battery panel will be 640 yuan.

In addition, the cost of the 180AH battery pack will also be about 1080 yuan, The one-time input cost of the whole street lamp is much higher than that of the city circuit lamp, which causes the main bottleneck in the application field of solar street lamps.

The service life of the battery of Wholesale Solar Street Lamps should also be considered in the application of the whole street lamp system. The general battery warranty is three or five years. However, the general battery will not be fully charged after one year or even half a year. Some actual charging rates may drop to about 50%, which will affect the normal lighting at night on continuous rainy days. Therefore, it is particularly important to choose a better battery.

Some engineers often choose LED lamps for the lighting of solar Wholesale Solar Street Lamps, but the quality of LED lamps is uneven, and LED lamps with severe light failure may lose 50% of the light intensity in half a year. Therefore, we must choose LED lamps with slow light attenuation, or choose electrodeless lamps, low-voltage sodium lamps, etc.

The controller with two-way power regulation should be selected. The controller with power regulation has been widely promoted. One or two ways of lighting can be automatically turned off at night when pedestrians are scarce to save electricity. The power of LED lights can also be adjusted. In addition to the above power-saving functions, attention should also be paid to the protection function of the controller on the battery and other components. For example, the controller with trickle charging mode can protect the battery well and increase the life of the battery. In addition, when setting the Undervoltage protection value of the controller, try to set the Undervoltage protection value to ≥ 11.1V to prevent the battery from discharging too much.

The selection of the controller is also a problem that is often ignored by engineers. The quality difference between the controller is uneven. The market price of the 12V/10A controller varies from 100 to 200 yuan. Although it is the least valuable part of the whole street lamp system, it is a very important link. The quality of the controller directly affects the component life of the solar street lamp system and the procurement cost of the entire system. First, the controller with low power consumption should be selected.

The controller works 24 hours without interruption. If its power consumption is large, it will consume part of the electrical energy. It is better to choose the controller with a power consumption of less than 1 mA (MA). 2： The controller with high charging efficiency should be selected. The controller with MCT charging mode can automatically track the maximum current of the battery panel. Especially in winter or in a period of insufficient light, the efficiency of the MCT charging mode is about 20% higher than other modes.

In places far away from the urban area, attention should also be paid to anti-theft work. Many engineers failed to carry out effective anti-theft work due to construction negligence, resulting in the theft of batteries, battery panels, and other components, which not only affects the normal lighting but also causes unnecessary property losses. In engineering cases, most of the stolen batteries are batteries, which are buried underground and poured with cement as an effective anti-theft measure

It is better to weld and reinforce the battery box installed on it.

Waterproof the controller. The controller of Wholesale Solar Street Lamps is generally installed in the lampshade and battery box, and water will not enter generally. However, in actual engineering cases, the connecting wire of the controller terminal is often short-circuited because rainwater flows into the controller along the connecting wire.

Therefore, during construction, the internal connecting wire should be bent into a “U” shape and fixed, and the external connecting wire can also be fixed as a “U” shape so that rainwater can not be poured in to cause a short circuit of the controller. In addition, waterproof glue can be applied at the interface of the internal and external wires.

In many practical applications of solar Wholesale Solar Street Lamps, solar Wholesale Solar Street Lamps in many places cannot meet the needs of normal lighting, especially on rainy days. In addition to the use of related components with poor quality, another main reason is that the cost of components is reduced blindly, the configuration is not designed according to demand, and the use standard of battery panels and batteries is reduced, so the Wholesale Solar Street Lamps cannot provide lighting in rainy days.

If you want to purchase Wholesale Solar Street Lamps, Dowell will be your best chocie!