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.

Solar Synchronized Road Studs

The solar synchronized road studs, which can also be called solar synchronized raised road markers or solar co-frequency road stud, refers to the solar road studs installed flickering in the same frequency, and work synchronized in the unity condition. And the Bluetooth synchronized solar road stud is one kind of the solar synchronized road studs. The Bluetooth synchronized solar road stud, which is also called Bluetooth solar co-frequency road stud, refers to the solar road studs installed separated which flash in the same frequency. It can delineate the way and the obstacles on the ground in the best visual effect. For the Bluetooth synchronized solar road studs work in the same flashing mode, they are always applied in the edge lines of the road, around the green belt and the obstacles, which are an effective technology method to beautify the cities, and they can also guide the drivers in fog weather conditions.

Solar Synchronized Road Studs
Specification for Bluetooth Synchronized Solar Road Stud
1.Material: Aluminium(GB-ADC-12)+PC(Japan Brand)
2.Lens: PMMA(ASTM D4280 & EN1463-1 standard)
3.Power supply: USA Brand High Efficient Solar Panel 5V/60MA
4.Battery: Lithium battery(3.2V/500mah)
5.Bluetooth:
(1):Communication frequency: 2.4G HZ
(2):Communication mode: Duplex
(3):Receive sensitivity: -92db
(4)Communication distance: Above 10m
(5)Stand-by power consumption: 2ma@3V
6.Working model: Synchronized flashing(2Hz)
7.Working hours: 55hours after fully charged
8.Installation distance:4M
9.Resistance: 30T
10.Water proof: IP68
11.Life span: 5Years

The Control Technology of Solar Synchronized Road Studs

The control technologies applied to the wireless solar road studs and the ones with wire are different.

Under the condition of wireless, the technologies adopted to the solar synchronized road studs are mainly: closed-loop control technology, interlocking technology, and short period embedded control technology.

Closed-loop control technology refers to the technology that a wireless master control emitter is set, and a receiver is installed in the solar synchronized road studs, which can control the solar road studs in its coverage area can work synchronized through the control of the wireless emitter, and the radius of this control technology can be in the range of 50 to 150m. It is expensive and difficult to reach the aim of making the solar road studs work synchronized within long distance. In addition, it is enslaved to the wireless frequency resources and the transmitted power of the mater controlled emitter.

The second advanced technology for the solar synchronized road studs uses the interlocking technology, which can locking the working condition of the solar synchronized road studs through interlocking. This type of solar synchronized road studs needs the interlocking period of 2 to 3 minutes when start-up, and it can maintain the synchronized condition if it is weighted interlocked. This technology can realize the chain-synchronized within the apparent distance, and there is no need for external control facilities. There is no demand for the distance of synchronized work for the solar road studs, and it can be installed in long distance. According to the actual measurement, the deviation for 24 hours is less than 50ms in the distance of 10 miles.

Short period embedded control technology is the latest control technology for the solar synchronized road studs, and it is the best technology nowadays. It uses the preset short period embedded control technology to start-up the built-in short period synchronized control method to realize high-precision synchronized work for the solar road studs installed dispersed. The deviation for 24 hours is usually less than 10ms and there is no distance require for this technology. It can realized long distance installation in the most convenient condition and there is no difference with the installation of the ordinary solar road studs. For the short period embedded control technology can realized the change of color, the adjustment of flicking period and brightness on the spot, which is unimaginable in previous times.

The other kind of solar synchronized road stud has wires, which can be called active solar road stud. It is connected through wires and the battery and circuitry can be changed, which has strong pressure resistance and stability and long service time.

 Application of the Solar Synchronized Road Studs

The solar synchronized road studs are widely applied all over the world for its advanced technology. Here an example of application will be introduced.

The crossing of the Fifth Ring Square of Linkonggang Avenue in Dong Xihu District locates in the arterial road of Dong xihu District, and the traffic flow of this crossing is not that heavy if compared with other roads with heavy traffic flow, however, there are many pedestrians who want to go across the road and the visibility is not good at night, this crossing become a black-spot. In order to solve this condition, a set of intelligent zebra crossing system is installed in the Linkonggang Avenue of Dong xihu District, and it can give pre-warning when vehicles passing, and the road studs on the zebra crossing will flashing when people go across the road. The vehicles will be pictured by the HD video camera if the vehicles cut in the road with pedestrians. If there are cars approaching, the system will warn that “A car is coming, please take care.” This is the first intelligent zebra crossing in Wuhan. According to the traffic management department, this system suits the crossing with small traffic flow and without traffic lights.

The head of the Order Division of the Traffic Brigade of the Dong xihu District says that this intelligent zebra crossing combines several intelligent technology like earth induction, video test, flashing road studs, scrolling display and voice prompt. The earth induction will send information to the control system and the voice prompt will warn to pedestrians if a vehicle comes to the places 50 meters ahead them. If the pedestrian or non-motor vehicles go across the road, the video test system will sent information to the flashing road studs through the control system and the road studs will flashing and become a warning light belt.
According to the introduction, once the vehicle with high speed and does not give way to pedestrians who are passing the intelligent zebra crossing, the earth induction system will start up the aerial video probe to obtain evidence, and the traffic police will punish the illegal vehicles according to the evidence. This system is installed in the beginning of this month, and until now, over 20 vehicle cutting in the road are photographed and those pictures will be displayed on the screens of the crossing. The pedestrian will be dragged into blacklist if he/she is photographed to run the red light for 3 times. The video storage device inside the system can not only supervise the illegal behaviors, but provide low basis for the traffic officers.

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