On Earth, most of our energy comes from the sun, and electricity is no exception. Our electricity is also obtained through solar energy conversion in different ways. Integrated solar power generation systems, portable power stations, and solar panels utilize solar energy for power generation.
The sun is a scorching fireball, with a surface temperature of approximately 6000 ℃ and a center temperature of 20 million ℃. It continuously radiates light and heat outward.
The sun, a scorching fireball, is far away from us. It radiates light and heat outward at a speed of 300000 kilometers per second, taking an 8-minute trek to reach Earth.
Among the numerous energy sources available to humanity, the highest grade should undoubtedly be electric energy. It can be easily converted into other forms of energy: magnetic energy, light energy, thermal energy, chemical energy, etc. And it's easy to transmit, which is something other energy sources cannot do
Broadly speaking, almost all of the energy on Earth is solar energy. Narrowly speaking, solar energy is divided into photothermal and optoelectronic
• When the conversion efficiency of the solar cell module is fixed, the power generation of the photovoltaic system is determined by the radiant intensity of the sun.
Several solar radiation data related to photovoltaic power generation
1) Sunshine duration: The time when the daily solar radiation exceeds 120W/120W/square meter in meteorology is not significant.
2) Peak solar hours. This is an equivalent concept, which refers to the number of hours when the daily solar radiant intensity intensity exceeds 1KW square meters (solar cell measurement standard light intensity). It is numerically equal to the average daily radiation divided by the standard light intensity, and the unit is h/d (hour/day)
1: The frequency response of different solar cells is different, usually between 300-1200nm.
2: Near infrared and near-ultraviolet rays can generate electricity.
3: Solar constant solar constant: the solar radiant intensity intensity per unit area of vertical sunlight at the average distance between the sun and the earth from the average sun and the earth outside the earth's atmosphere, expressed in AM0. 1367W ± 7W/m2, 25 ℃, 1000W/m2, AM1.5 are the testing conditions for solar cells.