With the rapid development of the road construction, especially the construction of the expressways in recent years, the road safety awareness of people has raised greatly. The road stud has widely applied in high-level roads and municipal roads, which is regarded as traffic safety sign. Compared with the ordinary road stud, the solar road stud has good visual effect, and the NI-MH battery, which is often applied in some high-end products, is applied as the energy storage device of the solar road stud. Combined with the LEDs or the new type road stud, which can only give out light passively, the solar road studs are always installed on the expressways. But how to choose a suitable solar road stud, and what factors influence the stability of the solar road studs?
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.
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