What is solar energy?

Solar energy is the energy produced by the continuous nuclear fusion reaction process inside the sun. Although the amount of solar radiation into the Earth’s atmosphere is only 2.2 billionth of its total radiant energy (about 3.75×1026W), it is as high as 173,000 TW, which means that the amount of energy that the sun shines on Earth every second is equivalent to 5 million tons of coal. Earth's wind energy, hydropower, ocean temperature energy, wave energy, biomass energy, and part of the tidal energy are all derived from the sun; even fossil fuels (such as coal, oil, natural gas, etc.) on Earth are fundamentally ancient. Solar energy has been stored since, so the scope of the broad scope of solar energy is very large. Solar energy in the narrow sense is limited to the direct conversion of solar thermal energy to photothermal, photoelectric and photochemical. Solar energy is both primary energy and renewable energy. It is rich in resources and can be used free of charge without transportation, without any pollution to the environment.