How do solar powered street lamp work?

Outdoor lighting plays an important role in public places. They provide road traffic safety and enhance the acctractiveness of the city. But, they consume a lot of power.

Nowadays, more and more people pursue the renewable energy-solar energy. Solar powered street lamp has been the primary light source of the outdoor lighting. It consist of solar panel, lighting fixture, battery, controller.

Solar powered street lamps work because of the photovoltaic effect. The most important part of a solar light is the solar cell. The solar cell of the solar panel can convert sunlight into direct electrical current. Then the battery will store the electrical energy as chemical energy in the day. The battery will turn the chemical energy into electrical energy in the night to light up the roads.

A solar cell is composed of multiple layers of crystalline silicone and chemicals that create layers of negatively-charged electrons.

The basic function of the solar street lamp controller is of course to have a control function. When the solar panel irradiates the solar energy, the solar panel will charge the battery. At this time, the controller will automatically detect the charging voltage and output voltage to the solar lamp. Only then will the solar street lights shine.
When solar energy shines on the solar panel, the solar panel will charge the battery. At this time, its voltage is very unstable. If it is directly charged, it may reduce the service life of the battery, and may even cause damage to the battery.
The controller has a voltage stabilizing function in it, which can perform constant voltage current limiting on the voltage of the input battery. When the battery is fully charged, it can charge a small part of the current or not.

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