With its unique advantages such as energy saving, environmental protection, and convenient installation, solar street lights have quietly entered the streets of the city... As a new measure of energy saving, how much energy can solar street lights contribute to energy saving?

1 Energy saving economy 

First of all, each solar street light is a relatively independent system. There is no need to pre-embed cables or excavate the road during installation and construction, which saves a considerable part of manpower, material resources and installation costs. Besides, power consumption, an ordinary street light is bright for a day. The lighting time is about 6 hours, the power consumption is about 2 kWh, and the electricity bill is more than 300 yuan a year. Calculated by 300 street lights in an urban area, it costs nearly 100,000 yuan a year, which can be saved by using solar street lights. 

According to reports, the country adds 50 million outdoor lights every year. If solar lights can account for 1/1,000, it can save hundreds of millions of kWh of electricity for the country a year, which is equivalent to sending a 100,000-kilowatt power station to the country. 

2 Principles of energy saving 

2.1 How do solar panels store energy? 

The main material of solar panels is silicon, but there are also some other alloys. When the solar panel is illuminated by light, it can convert the light energy into electrical energy, so that the current flows from one side to the other side. Solar panels are designed according to this principle. 