Photovoltaic power generation energy payback period

Photovoltaic power generation energy payback period

Photovoltaic power generation energy payback period
As a new power generation method, the energy payback period and rate of return of photovoltaic power generation are the focus of people’s attention.
According to the life cycle assessment method, the energy payback period EPT (Energy Payback Time) of a solar photovoltaic system is based on the total energy consumed in its full life cycle (including the energy consumed during manufacturing, installation and operation) and the annual operating time of the photovoltaic system. It is expressed as the ratio of energy output, and the unit is year. According to the current operating status of photovoltaic power plants, photovoltaic power plants in most areas of China produce an average of no less than 1kWh per watt per year. With the continuous reduction of the production cost of photovoltaic modules in recent years, the energy payback period of photovoltaic power generation has been able to achieve no more than two years.
RER (Rate of Energy Return) refers to the ratio of the total energy generated by the power generation equipment during its life cycle to the total energy consumption of the manufacturing process. In order to ensure the higher reliability and economy of photovoltaic power generation, the industry has stipulated the warranty period of photovoltaic modules. The current internationally accepted photovoltaic module warranty period is 25 years. The so-called warranty period of photovoltaic modules means that when the service life of photovoltaic modules reaches the limit of years specified in the quality assurance, the power attenuation shall not exceed 20%. Numerous cases fully show that the 25-year warranty period can be guaranteed. Even if calculated on the basis of a 25-year service life and a photovoltaic module produces 1kWh of electricity per watt per year, 25 kWh of electricity can be generated in 25 years, so the energy return rate can exceed 12. Than.
At present, the cost per kilowatt-hour of photovoltaic power generation has been lower than 0.5 yuan/kWh, and the investment payback period of photovoltaic power plants has been shortened to 5-6 years. With the continuous advancement of technology and the large-scale application of photovoltaic power stations, the economics of photovoltaic power generation will be more obvious.
In addition, after photovoltaic modules cannot continue to generate electricity and are recycled, most of their materials can also be recycled and reused, which is fully in line with the goal of environmentally friendly green power generation and the harmonious development of nature.

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