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How Do Solar Powered Road Signs Work

The working principle of the eye-catching solar road signs in the night sky:
During the day, solar panels of solar traffic sign absorb sunlight and convert solar energy into electrical energy, which is stored in energy storage devices. At night, the electrical energy in the energy storage devices is automatically converted into light energy (controlled by photoelectric switches), and the LED emits bright light to outline the pattern , To convey traffic information.
The early solar powered road sign was basically a light box, and the circuit, controller, and battery were all placed in the box. Its disadvantages: the box is too bulky and the solar panel is too large, which is not conducive to packaging and transportation. During the transportation, internal damage is often caused; the battery and circuit are sealed in the box and should not be replaced; the box is too large and sealed Sex is not suitable for control;

The solar road sign is based on monocrystalline silicon solar cell modules as energy source. Solar powered traffic sign does not require grid support and is not restricted by region. It is very convenient to use! The solar road sign uses solar cells to convert daylight into electricity and stores it in the sign. When the night falls, the light is dim, or rainy and foggy, the light-emitting diodes on the sign will automatically start flashing, and the light is particularly bright and eye-catching. Strong warning effect. Especially on highways without power supply, frequently moving construction sites and dangerous areas, this kind of active luminous sign exhibits a special warning effect. The visible distance of solar road sign is 5 times that of a sign with a reflective film as a reflective material. Its dynamic effect cannot be replaced by ordinary signs.

The design principle of solar powered road sign is to convert light energy into electric energy and store it as a backup. When there is no sunlight, the energy storage device will recharge the electricity. There are three main types of energy storage equipment: battery energy storage, capacitive energy storage, and inductive energy storage. Among them, battery energy storage is relatively widely used because of its large capacity, small size, and low cost. As a solar traffic sign, it is suitable for battery energy storage. Energy storage batteries are accumulators, which are classified into lead-acid batteries, nickel-hydrogen batteries, and lithium batteries based on internal materials. The batteries that meet the traffic outdoor environment should be nickel-metal hydride and lithium batteries, because they are relatively superior to lead-acid batteries in terms of high and low temperature characteristics, capacity-to-volume ratio, environmental protection, and lifespan. If we keep 60% capacity, the number of cycles of lead-acid batteries is about 400 times, that of nickel-hydrogen batteries is about 500 times, and that of lithium batteries is about 600 times.


The number of cycles means that the battery is fully charged and fully discharged as a cycle. In fact, the battery of solar road sign is charged when 1/5 of the battery is discharged most of the time. The working mode of shallow discharge and shallow charging can greatly extend the life of the battery. Using lithium battery for routine use, the life span is about 4 years. The battery is the bottleneck restricting its life. The battery of solar road sign should be easy to replace while paying attention to moisture-proof.