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Photovoltaic Small Science: Let You Know More About Photovoltaic Power Generation
- Apr 18, 2018 -

1, What are the components of a solar photovoltaic device?

The whole set of equipment consists of solar modules, support system, inverter, electrical distribution system, etc. The installation and commissioning of the equipment can be completed within 1 to 3 days. It is not necessary to make any changes to the original home wiring, and it can be used normally for 25 years. about.

2, What are the conditions for installing solar photovoltaic equipment?

As long as your home has a certain area of unobstructed surface, slope or exterior wall conditions, you can apply for installation, do not damage the roof and waterproof.

3, The roof distributed photovoltaic system is not safe? Will there be risks of illegal construction?

At present, the distributed photovoltaic power generation system has been developed for several years and already has a very mature market experience. It is also very safe and reasonable in design and technology. It is not necessary to reform the house. The installation scheme can be designed according to the different building environments. Not only the common concrete roofs for self-built houses, the glazed tile roofs of the villas, but also the steel tile roofs of the factory roof can all be used to build distributed photovoltaics.

For the development of distributed photovoltaics on buildings, the state strongly supports them, and has issued various types of supporting documents, and has not violated construction risks. Grid companies also encourage and support the acceptance of grid connection. As long as distributed PV is built, it can apply for grid connection with the grid company, with no indicator limit.

4, Install a set of solar photovoltaic power generation equipment need to invest in how much?

According to the installation power, the basic type of current installation cost per kilowatt is about 10,000 yuan, and the general household solar photovoltaic power generation equipment in the villa is in the range of 5 to 8 kilowatts, all invested in 6 to 10 million. General rural household solar photovoltaic power generation equipment in the 3 to 5 kilowatts range, all invested in 30,000 to 50,000 yuan. (The actual price has been adjusted according to the actual situation of the project).

5, The initial investment is so expensive, three or five million yuan can be more than a decade of electricity, and will lose money?

The benefits of photovoltaic power generation are not only to save electricity revenue, but also state subsidies, and some local subsidies. According to the mode of self-use and surplus electricity consumption, the total revenue of photovoltaic power generation = savings in electricity expenses + excess sales revenue + state subsidies + local subsidies. In this way, most of the country will be able to recover costs in 5-8 years, bringing about 25 years of stable cash flow, and the profitability of photovoltaic power generation is still good.

With regard to the cost of photovoltaic power generation, a set of high-quality photovoltaic power generation systems, the main materials accounted for 70% of the total system cost, installation fees accounted for 10%, and the remaining part of the cost of supporting the normal operation of the company. For rural users, the country has introduced a Sunshine loan service and a PV poverty alleviation policy. In the near future, every household can afford PV power generation.

6, Life is too low, and later maintenance costs effort. What kind of disaster should you face in case of a loss?

A set of photovoltaic power generation system can generate more than 25 years of normal power. If a qualified product is strictly selected, a high-quality system integrator can basically guarantee that there will be no additional maintenance costs in the later period. Most brand companies provide limited power generation warranty for photovoltaic modules produced, and the power generation attenuation will not exceed 20% of the nominal power in 20 years.

With regard to this ability to resist natural disasters, this year's strongest typhoon in the history of the Pearl River Delta’s 14th-level transit did not even have a problem with the power station, and it all operated smoothly. Facts have proved that in accordance with the scientific design program construction, the photovoltaic power plant's ability to resist natural disasters is no problem.

7, There is a state subsidy now. What if it is canceled one day?

Regarding the subsidy issue, the state has a subsidy of 0.42 yuan per degree for the self-use model, which is 20 years. After the establishment of the station, the subsidy of 0.42 yuan will be received in the next 20 years; if the subsidy is cancelled sometime in the future, the previously built power station will be cancelled. It will not be affected. Only after the construction of the photovoltaic power station will it not enjoy subsidies. Therefore, it is golden opportunity to seize the current subsidy to invest in photovoltaic power plants.

Distributed photovoltaic power generation is still very broad, but the development path of any new things will not be easy. In the future, more people will be accepted, families and industrial and commercial buildings will be installed on the roof, and people will feel the changes in life brought about by photovoltaic power generation.

8. How do you see the news that “the production of photovoltaic modules consumes a lot of energy”?

Photovoltaic cells do consume a certain amount of energy in the production process, among which industrial silicon purification, high-purity polysilicon production, and monocrystalline silicon rod/multicrystalline silicon ingot production have higher energy consumption. However, photovoltaic cells can generate energy continuously over the useful life of 20 years. According to calculations, under the average sunshine condition in China, the energy return of the 

photovoltaic power generation system exceeds 15 times of its energy consumption over the entire life cycle. The energy recovery period for a 1-kilowatt rooftop grid-tied grid system installed at the best inclination in Beijing is 1.5 to 2 years, which is far below the lifetime of the photovoltaic system. In other words, the amount of electricity emitted in the first 1.5-2 years of the PV system is used to offset the energy consumed in its production and other processes. The energy emitted after 1.5-2 years is purely produced energy. Therefore, the energy consumption of photovoltaic cells should be evaluated from the perspective of the whole life cycle.

9. How much sunlight can we use? Can it become the dominant energy in the future?

The solar radiation received by the Earth's surface can meet 10,000 times the global energy demand. The average annual radiation received per square meter of ground surface is approximately between 1000-2000 kWh. According to the International Energy Agency, installing photovoltaic power systems in 4% of the world's deserts is enough to meet global energy demand. Photovoltaic power generation has vast potential for development (roofs, architectural surfaces, open spaces, deserts, etc.) and has great potential.

According to preliminary statistics, China uses only the existing building roofs to install distributed photovoltaic power generation. Its market potential is approximately 300 million kilowatts or more. Coupled with the vast Gobi in the west, the market potential for photovoltaic power generation is about several billion kilowatts. With the technological advancement and large-scale application of photovoltaic power generation, the cost of power generation will be further reduced, becoming a more competitive energy supply method, gradually transitioning from supplementary energy to alternative energy, and promising to become the dominant energy in the future.