Solar Road Stud

The solar road stud is the traffic safety product that uses the solar panel as the charge device, battery or electric capacitance as the energy storage device and the light of the stud is given out through the LED. According to the demands of the Ministry of Transportation, the pressure resistance of the solar road stud should be over 100KN. The solar road stud is set along the road, and it can be applied to delineate the way at night or in rainy or foggy days. Its visual effect is better than the ordinary road stud, and it is always applied together with the marked lines on the road.
The solar road studs can be divided into two types according to the energy storage device: the solar road stud (battery) and the solar road stud (energy capacitance).

Solar Road Stud

The solar road studs can be divided into two types according to the color of the LED: the solar road studs of red and yellow, and the solar road studs of white, blue and green.

Characteristics of the Solar Road Stud
1.High brightness
The reflective brightness of the ordinary reflective stud is only 300-400MCD, but the brightness of the solar road stud can be over 2000MCD, which is 6 to 7 times of the former one, and the high brightness can penetrate rain or fog at night and guide the way effectively for the drivers.
2.Flashing synchronically and giving warnings initiatively
The solar road stud can flash in a certain frequency at night, and the visual of people are more sensitive to changes, so the warning function of the solar road stud is quite strong. Giving out light initiatively can not only avoid interruptions of rain and fog to the greatest extent, but make the drivers get rid of the reliance of light of cars, which will make the visual distance longer and greater. The solar road stud plays key role in rainy or foggy days and it does more in the aspect of eliminating security risks.

The working principle of the solar road studs
The solar panel of the solar road stud absorbs solar energy, which can be transformed into electric energy and stored inside the energy storage device, like battery or electric capacitance, in the daytime, and the electric energy inside the energy storage device can be transformed into light, which can be controlled through the photoelectric switch, at night. The light is given out through the LEDs to delineate the way and guide the sight of the drivers.
The solar road studs can be divided into the embedded type and raised type according to the difference of installation site.
The former one is always installed in the central line, and the latter one is installed in the edge of the road. For the solar road stud installed in the central line should have strong pressure resistance, and the solar road stud can only be embedded underground and only 5mm above the ground; the solar road stud installed in the edge of the road does not have strict demands on pressure resistance, and it can work effectively even raised on the ground.
The solar road studs can be divided into the capacitive type and the battery type according to the difference of the energy storage elements of the solar road studs, and the service time of the former one can be 5 to 7 years, and that of the latter can be 1 to 3 years.
For the embedded solar road studs damage the surface of roads greatly, and the cost of the capacitive solar road studs is high, so the embedded capacitive solar road studs are widely applied in our daily life now.

Installation of solar road stud

Characteristics of the solar road studs
There are some characteristics should be paid more attention when choosing a solar road stud. If all those characteristics can meet the standard, the solar road stud will be a qualified one.

1. Pressure resistance
The solar road stud will break into pieces after being cracked by the cars if it cannot resist certain pressure, so the solar road stud must have good performance in pressure resistance. But some cheap road studs have hollow structures, which can decrease the cost. The qualified solar road stud has no difference with the cheap one in outlook, once the unqualified solar road studs are put into use, the quality problem will appear after 3 to 5 months.

There are several ways to increaser the pressure resistance of the solar road stud: first, use the solar panel of PC bullet resistant material to increaser the pressure resistance of the electronic part; second, use to IC control to decrease the volume of the electronic circuit to decrease the pressure on the electronic part; third, design some strengthening ribs on the shell of the solar road stud to share the pressure on the electronic part.

solar road stud packing

2. Sealing performance
If the solar road stud is not sealed perfectly, the water will penetrate into them, which will cause short circuit, which will bring disastrous consequence, so a qualified solar road stud must have perfect performance in sealing.

There are several ways to increaser the sealing performance of the LED solar road stud:

separation design. Adapting separation design on the LED lampshade and the inside electric circuit panel, even the LED lampshade is out of work, the inside part of the solar road stud can be sealed perfectly.

Using the neutral adhesives to guarantee the solar panel, LED lampshade and the shell of the stud can be connected tightly.

3.Brightness
The solar road stud can guide the drivers through automatic illumination, and only when the brightness reaches 2000MCD, the solar road stud is qualified. However, the reflective road stud can only give out light through the reflection of the light of the vehicles, which is lower in lamination quality than the solar road stud.

4. Stability
Service time of the battery: the key factor that determines the service time of the solar road stud is the service time of the battery, so it is quite important to choose a suitable battery. Now there are two types of battery can be applied on the market, one is that battery that the capacity decreases to 50% after 500 times charge & discharge, and the other is the battery that the capacity decreases to 70% after 1000 times charge & discharge.

The battery should not only has long service time, but can work in a large temperature range. The chemical substances are set inside the battery, if the temperature is too high or low, the battery will out of work. The working temperature range of the battery of the solar road stud should be I accordance with the practical working environment. The demand on the working temperature range of national ministry of transportation is -10℃ to 50℃, however, the real environment is out of this range, which asks high for the performance of the battery.

Electronic circuit: the design of the circuit board should follow the principle of simple and effective, and there is no need to make it complicated, for one more circuit will raise the possibility of the fault. The electronic devices should be chose strictly, for every fault of the electronic device will cause break down of the whole system.

Welding: the welding of the solar road stud must be firm. For the solar road studs resist crash and crack of the vehicles all the time, a little loose of the welding point will cause the fall off of the circuit. The high quality products should be used in welding to ensure the firm of the welding point and to make it can work for a long time in severe condition.

Solar panel: the solar panel can absorb solar energy directly and it can transform the solar energy into electrical energy, so this is the first link in the whole system of the solar road stud. The working efficiency of the solar panel determines that of the solar road stud directly. Now the monocrystalline silicon solar panel is widely used, for it has high photoelectric conversion rate, which is almost 14%, which can transforms the solar energy into electrical energy to the greatest extent to ensure the energy supply in the working time of the solar road stud. in addition, the solar panel must be hard and anti-friction. For it should resist the crash of wheels energy, if the solar panel is not hard enough, it is easy to be destroyed, which will influence the conversion rate of the solar panel.

5.The matching performance of the battery
The rated capacity of the battery can satisfied the needs of illuminating for 72 hours if set under the testing condition for 8 hours. Even the solar illuminance is less than 1000LX, the rated capacity of the battery should be illuminating for 12 hours after 8 hours’ charge. If the matching performance of the battery is poor, the solar road stud cannot give out light in rainy days and it will out of practical value. And this is the limitation of the solar road stud whose energy storage device is electric capacitance. This type of solar road stud has strict demands on working environment, and it not only need strong sunlight, but should work without continuous rainy or cloudy days.

6.Environmental adaptation performance
The application environment of the solar road stud in complicated, and the application temperature and humidity are different. All of these will influence the normal work of the solar road stud, so the environmental adaptation performance should be taken into consideration in the design of the solar road stud.

application of solar road stud

Now the Ministry of Transportation notes that the working temperature of the solar road stud should be in the range of -20 to 85℃, and three experiments should be carried out in the temperature between 20 to 60℃ to know whether the solar road stud can adapt the demand of the environment. The Ministry of Transportation regulates that the solar road stud should work effectively after 48 hours testing in the condition of 45℃ and relative humidity of 98%.

The environmental adaptation performance of the LED solar road stud is a comprehensive testing for the mechanical performance and electronic performance of the stud, which involves the aspects of structural design, electric circuit design and electronic device performance, even it production engineering. This asks that all aspects should be perfect to guarantee the solar road stud has good environmental adaptation performance.

Performance Indicators of the Solar Road Stud

When research the basic characteristics of any kind of solar road stud, the following aspects should be considered.

Pressure Resistance

If the solar road stud cannot work under a certain extent of pressure, it will be out of work after several times crush or crash. So the compression resistance should be the most basic condition for the solar road stud. For the solar road stud is a electronic product, it is not that easy to make the road stud has strong pressure resistance. Thus the pressure resistance of the solar road stud is lower than the ordinary road stud.

There are several methods to increase the pressure resistance of solar road stud: 1. Use the PC bullet resistant material to make the solar panel outside to increase the pressure resistance of the electronic part of the road stud; 2. Use the IC control to decrease the volume of electronic circuit; 3. Put the reinforcing ribs on the shell to share the pressure on the electronic part.

Sealing property

The water will permeate into the solar road stud if it is not sealed tightly, which will cause short circuit, so the sealing property of the solar road stud should be good.

Several methods are provided to increase the sealing property of the solar road stud:

solar road stud
Separation design. Adopted separation design of the led lampshade and the circuit board inside the road stud, and even the led lampshade is out of work, there will be no water permeating inside the solar road stud.
Using the strong neutral adhesive to ensure that the solar panel, led lampshade and the shell of road stud can bond tightly, and there is no gap between them.

Brightness

Solar road stud has one special characteristic when compared with common road stud, and that is, it must auto luminescence. The transportation sector has relative standard for this index, which is 2,000MCD.

Solar Road Stud - D1

Stability

Life span of the battery: Another factor that influences the life span of the solar road stud is the using time of battery, so it is quite important to choose a battery with good performance. Now there are two kinds of batteries to choose, and one battery whose capacity would reduce to 50% after 500 times charge-and-discharge and the other is the battery whose capacity would reduce to 79% after 1,000 times charge-and-discharge.

The using life of a battery should be long enough, and it must be working effectively in a wide range of temperature interval. The material inside a battery is chemical substances, and it cannot work in the environment which is too hot or too cold. So, the working temperature range should be abided with requirements of actual using environment. The requirement of related standard made by transportation sector for this index is that the solar road stud should work in the temperature between -10°C to 50°C. Actually, the working temperature of solar road stud may out of this range, so the battery with reliable quality and excellent performance need to be chosen to make the solar road stud.

Electronic circuit: The design principle of simple and effective should be followed. One more circuit will increase the possibility of malfunction. The electronic components should also be chosen strictly, for the whole system will be out of work if one electronic component is broken.

Welding: The welding of the solar road stud should be firm. For it is crashed or shocked everyday, a little loose of the welding spot will cause the loose of break off of the circuit, the high-quality welding gun and soldering should be chosen to ensure that the wielding spot is firm and can work long enough in severe environment.

Solar panel: The solar panel can absorb solar energy and transform it into electric energy, and this can be the first link of the whole working system of the solar road stud. The efficiency of the solar panel determines the efficiency of the solar road stud. The single crystal silicon solar panel is widely used nowadays, for it has high photoelectric conversion efficiency, which can be about 14%, to ensure the energy providing when the solar road stud is working. In addition, the solar panel must be high hardness and wear-resisting. For the solar road stud will resist crash and shock everyday, if it is not hard enough, the solar panel will be destroyed and influence the conversion efficiency of the solar panel.

Matching Performance of Battery

The rated capacity of the battery should meet the needs of 72 hours’ illuminating, if the battery is put in the standard testing condition for 8 hours. Even if the solar illumination is less than 1,000LX, the rated capacity of the battery should make road stud work normally for 12 hours after 8 hours’ charge. One thing should be noted, if the matching performance of battery is not that good, it will be lack of power in wet weather, which may cause the un-illuminate of solar road stud. If this condition happens, the solar road stud will out of particle value. This is also the limitation of capacitive solar road stud. If being put under the standard testing condition for 8 hours, the rated capacity capacitor can only make the solar road stud work for 12 to 14 hours, that is to say, the capacitive solar road stud is strict with its actual working environment, which should not only have enough sunshine, but should not work in continuous rainy weathers.

LED Road Stud

With the development of the traffic safety industry, the road studs become normal in our life. The road studs strengthen the visibility at night, and reduce the using of street lamp, which are much more energy saving and environmentally friendly. There are several kinds of road studs, such as the cast aluminum road stud, amber road stud, the solar road studs, the embedded solar stud, and so on. Although the road reflector is a kind of electronic product, the installation and maintaining are quite strict, so if one product has passed the test, the outlook or other conditions of it will not be changed.

Development and use of road studs
With the development of the lighting project in cities, people has paid more attention on the field of road markers, which gives them a chance to be improved. The road markers are not only extend the area of city space, but a way for the cities to show their history, culture, and natural landscape. To beautify the cities and improve the investment and living environment, a large number of road markers are applied in different cities all over the world, which has become a major element to promote the flourish and development of the industry of business and tourism, which has also bring great economic and social benefits to the cities.

The road stud industry has developed rapidly those years, however, energy saving and environmentally friendly should always be the pursuit of this industry. To meet this, a large number of LED solar road studs are used in most part of the world. The solar panel of the road marker absorbs solar energy in daytime, which is transformed into electric energy and stored in the battery inside it, and gives out light to warn pedestrians about the road condition at night. The solar road studs are widely used in different countries, but the development conditions are not the same. For the price of solar road stud is expensive, it is mainly used in cities, which covers only 30% all of China. In America, the government support the use of high-tech products, so the the applying of solar road studs covers 90% of the market, which has the highest popularity rate among the world. In Russia, for the direct lighting time is short, where is not suitable to used the solar products, the solar road studs are not used that wide there. But wind energy is used widely in Russia.

There is data shows that in 2050, about 60% of the total electric energy are produced by solar energy, which will reduce the carbon emission of about 6 billion, thus the future of solar enegy is brilliant.

The LED solar road stud of A1
The road stud is a kind of aluminum road stud which can reduce traffic accidents at intersections of crossings of the road and give guidance and hazard warning at night or bad weathers. The solar panel on it absorbs sunlight in daytime, and transforms the solar energy into electrical energy, which is stored in the NI-MH battery or Lithum battery inside it, and then gives out light automatically at night. The aluminum shell of the raised pavement marker is much stronger than the traditional road studs.

LED Solar Road Stud A1

Features of the road stud:
– Strong compressive resistance.
– Lower cost than traditional road stud reflectors.
– Visibility is 10 times greater for drivers than glass reflective highway road markers.
– Visible in rainy or foggy days.
– Better water proof performance: IP68.
– Effective additional driver safety when used in conjunction with street light reduction schemes.

LED solar road stud of A6
The solar road stud, which is maintenance-free, is a lighting device powered by solar energy and is used in road construction to delineate the road for motorists. The reflective pavement marker of aluminum shell has strong pressure resistance, and the pressure resistance of A6 is over 20 tons, so it is always installed in the center line of roads. Compared with the plastic road studs, the cast aluminum stud is much more visible in rainy or foggy conditions. The reflective pavement marker has two working method: one is blink and the other is constant lighting, which can satisfy various needs of the users.

LED Solar Road Stud A6

Features of the solar road studs:
– High temperature adaptation, high quality NI-Mh battery.
– Aluminum shell with strong pressure resistance of over 20 tons.
– Inside reflector.
– Better water proof performance: IP68.
– Several colors: blue, white, green, yellow.
– Double side led road stud or single face green reflective stud can be designed.
– Long visual distance of over 800m.

LED solar road stud of A6-1
The solar road stud is made by aluminum and PC, which has strong pressure resistance of over 30 tons in total. Thus, it can be installed in the middle of the road, where the pressure is much stronger than other places of the road surface, and the cars can drive on the solar led marker directly. Compared with other products made by aluminum and PC, the pressure resistance of A6-1 is much better, so it is used widely in main streets where the car flows are huge. The solar road stud has two reflectors, and the led lights on them are America brand of high brightness, so the visual distance of this product is longer than other road studs.

LED Solar Road Stud A6-1

Features of the solar road stud:
– America brand led light with high brightness of 100,000 hours’ working time.
– USA brand solar panel. 22% high conversion rate. Fast charge rate.
– Japan brand casting Al material. Solar stud bears more pressure.
– Philips PC board, safe and stable. Long time warranty for road stud reflectors.
– High temperature resistance battery. Working from -40°C to +80°C.
– Solar led marker lights are tested in water proof, charge rate and hardness before selling.
– Designed by integrated circuit and thermo stability rechargeable batteries from solar road studs manufacturers. Ensure the long servicing life and performance of the product