Photovoltaic power generation converts light energy directly into DC power through the characteristics of semiconductors, and then converts DC power into AC power that can be used by us through an inverter.
The photovoltaic system is composed of photovoltaic modules, brackets, DC cables, inverters, AC cables, power distribution cabinets, transformers, etc. The brackets are not charged, so naturally no electromagnetic radiation will be generated. Photovoltaic modules and DC cables contain DC current, and the direction does not change. They can only generate electric fields, but not magnetic fields.
Although the output transformer is AC, the frequency is very low, only 50Hz, and the magnetic field generated is very low. The inverter is a device that converts direct current into alternating current. It contains power electronic conversion, and the frequency is generally 5-20KHz, so it will generate an alternating electric field, so it will also generate electromagnetic radiation. The country has strict standards for the electromagnetic compatibility of photovoltaic inverters.
Compared with household appliances, the electromagnetic radiation of photovoltaic inverters is about the same as that of laptop computers, and lower than that of induction cookers, hair dryers, and refrigerators.Also read:How to hook up solar panels to rv batteries
Therefore, the construction of photovoltaic power plants will not only cause no harm to human health, but can also provide green, clean and high-quality energy for the earth, which is the future energy development direction of mankind.
The manufacturing process is not “energy-intensive”
I don’t know how many people have slandered and said that photovoltaic power generation is high pollution and high energy consumption in the manufacturing process. Such rumors have been spread more than once.
The photovoltaic manufacturing industry mainly includes four links: crystalline silicon purification, silicon ingots and wafers, photovoltaic cells and photovoltaic modules. Among them, the purification of crystalline silicon needs to be completed under high temperature conditions, which consumes a lot of electric energy, accounting for about 56%-72% of the total energy consumption, and is the most important chemical production process in the industrial chain; while “high pollution” comes from high-purity polysilicon by-products of production.
Crystalline silicon purification is indeed a large-scale, high-energy-consuming industry. However, this does not mean that photovoltaic products are high energy consumption. It is necessary to convert the total energy consumed in the production of a unit of photovoltaic modules into electricity consumption, and compare it with the power generation of the modules in their entire life. In 2015, the Ministry of Industry and Information Technology issued the “Standard Conditions for the Photovoltaic Manufacturing Industry”, which stipulates that the power consumption of the polysilicon production process must be less than 120 kWh/kg; new construction and expansion projects must be less than 100 kWh/kg, which should be relatively close to the current energy consumption level. world advanced level.
Based on this conversion, in line with the photovoltaic power consumption stipulated by the state, the production of one watt of photovoltaic modules requires 0.6-1.2 kilowatt-hours of electricity. According to the 25-year life of photovoltaic modules, photovoltaic power generation is far greater than production power consumption.
no light pollution
Pollution is threatening people’s health. In daily life, the common light pollution conditions of people are mostly the dizziness of pedestrians and drivers caused by the reflection of mirrored buildings, and the discomfort caused by unreasonable lights at night.
So everyone is very worried about whether there will be light pollution when installing photovoltaic modules. In fact, the visible light reflection coefficient of ordinary toughened glass is 9%~11%, which will not cause light pollution. The photovoltaic modules use the same type of glass as the building, and will not cause light pollution.
The source of light pollution is visible light. The internal power generation unit cells of photovoltaic modules will absorb visible light and convert it into electrical energy, which will further reduce the reflection of visible light.Also read:Can you put out a lithium battery fire with water
And with technological innovation, many photovoltaic building materials can now be made into frosted surfaces, which can reduce the reflection of visible light.
No noise, no emissions
These two points are relatively easy to understand. Photovoltaic power generation is the conversion of solar energy into electrical energy. It is a photoelectric conversion. During the process, there will be no noise and no pollution emissions. It is very suitable for installation on residential and industrial and commercial roofs.
In recent years, distributed photovoltaics have developed rapidly, and most of them are fancy photovoltaic power generation is suitable for installation on the roof, which has the function of energy saving and emission reduction, and can also be heat-insulated and waterproof.