What is photovoltaic? In 1839, France Becquerel discovered for the first time that under light conditions, there is voltage at both ends of some solid systems, and the two ends are connected with wires, and there will be current output. This is the photovoltaic effect (photovoltaics referred to as PV)   In 1954, Bell Labs Chapin and others developed a single-product silicon solar ground with an efficiency of 6%, and the era of modern silicon solar power began.   The realization of solar photovoltaic is to use solar panels made of semiconductors such as silicon to generate direct current by using light. Since 1958, the photovoltaic effect of solar energy has been used for the first time in the field of energy supply for space satellites in the form of solar electricity. Today, it can be as small as the energy supply of automatic parking meters, roof solar panels, and as large as a large-scale solar power generation center. , and its application in the field of power generation has spread all over the world.   Photovoltaic technology offers many advantages:   1. No mechanical moving parts;   2. In addition to sunlight, no other fuel is required;   3. Can work under direct sunlight and exposure;   4. At the same time, solar modules require no maintenance and minimize operating costs;   5. The site selection is convenient and flexible, and the roofs and open spaces in the city can be used.