Recently, some people asked me: our family wants to install photovoltaic power generation, but the so-called photovoltaic power generation is literally inseparable from sunshine! Isn’t it useless to have cloudy days, rain and snow? Before answering this question, let’s learn what photovoltaic power generation is.
Principle of photovoltaic power generation
Photovoltaic power generation is the photoelectric effect of semiconductors. When a photon irradiates the surface of a metal or semiconductor, its energy can be fully absorbed by an electron in the metal or semiconductor. The energy absorbed by the electron is large enough to overcome the internal gravity of the object and leave the original object surface to become photoelectrons. The current formed by photoelectrons is called photocurrent.
When it comes to photovoltaic power generation, we have to mention “solar power generation”. Many people think that photovoltaic power generation is solar power generation. In fact, it is not. The relationship between them is that photovoltaic power generation is only a kind of solar power generation. Solar power generation also includes photochemical power generation, light sensing power generation and photobiological power generation.
Does photovoltaic power generation have radiation?
Household photovoltaic power station is composed of solar modules, inverters, solar support bracket and solar cables. The whole power generation process directly converts light energy into electric energy without any chemical change and nuclear reaction. Therefore, photovoltaic power generation is an absolutely clean (pollution-free) clean energy with safety, reliability, no noise, no radiation and so on.
Photovoltaic power generation not only has no radiation, but also can reflect some harmful ultraviolet rays in the sunlight, so it will not harm our health, but will help us reflect some harmful ultraviolet rays!
Can electricity be generated in rainy and snowy weather?
In most people’s understanding, photovoltaic power generation needs sunshine to generate electricity, especially in the south. In the plum rain season, many friends who installed photovoltaic or wanted to install photovoltaic began to worry. Will cloudy and rainy weather have a great impact on photovoltaic power generation? If it snows in winter, can it generate electricity?
While obtaining energy, photovoltaic power generation is indeed related to meteorological conditions such as four seasons, day and night, cloudy and sunny.
However, in rainy and snowy weather, although there is no direct sunlight, the power generation capacity of photovoltaic power station will be relatively low, but it is not that there is no power generation. Solar modules can also generate power to a certain extent under weak light conditions.
However, in some special cases, the solar radiation is too low, and if the working voltage of the photovoltaic power generation system cannot reach the starting voltage of the inverter, the system will not work.
Although we can’t control the weather, we can do a good job in the maintenance of solar modules in our daily life.
Don’t worry about the damage to solar modules caused by rain and snow. Solar modules need regular cleaning and maintenance. On rainy days, it’s time to clean solar modules for free, which saves another sum of money.
