There are two methods for solar power generation, one is the light-heat-electric conversion method, and the other is the light-electric direct conversion method.

　　(1) Light-heat-electric conversion

　　In this conversion method, the solar heat collector converts the absorbed heat energy into steam, and then drives the steam turbine to generate electricity.

　　The former process is a light-heat conversion process; the latter process is a heat-electric conversion process.

　　The disadvantages of solar thermal power generation are low efficiency and high cost. Under the same output power, it is estimated that its investment is at least 5-10 times more expensive than ordinary thermal power plants.

　　A 1,000MW solar thermal power station requires an investment of 2 to 2.5 billion US dollars, and the average investment of 1kW is 2000 to 2500 US dollars. Therefore, it cannot compete with ordinary thermal power plants or nuclear power plants.

　　(2) Light-to-electricity direct conversion

　　Direct photoelectric conversion is made according to the photoelectric properties of specific materials.

　　Black bodies (such as the sun) radiate electromagnetic waves of different wavelengths (corresponding to different frequencies), such as infrared, ultraviolet, visible light, and so on.

　　The shorter the wavelength and the higher the frequency of the rays, the higher the energy they have. For example, the energy of ultraviolet rays is much higher than that of infrared rays. However, not all wavelengths of radiation energy can be converted into electrical energy. The key is that current can only be generated when the frequency reaches or exceeds the threshold that can produce the photoelectric effect.

　　The band gap of crystalline silicon is about 1.155 eV at room temperature, so light with a wavelength of less than 1100 nm is required to make crystalline silicon produce a photoelectric effect.

　　Lithium-ion battery (LIB) has become the main energy storage solution in modern social life. Among them, lithium iron phosphate batteries are a perfect replacement for lead-acid batteries, and they are the first choice for grid-connected peak shaving, off-grid energy storage, photovoltaic energy storage, UPS, data center and other industries.

　　Solar power generation system with lithium battery energy storage system is a very promising clean energy.