Calculation method of photovoltaic power station power generation, theoretical annual power generation = annual average total solar radiation * total battery area * photoelectric conversion efficiency. However, due to the influence of various factors, the actual power generation of photovoltaic power stations is not that much. Actual annual power generation = theoretical annual power generation * actual power generation efficiency. So what factors affect the power generation of photovoltaic power plants?

1.1. Solar radiation amount
Solar cell modules are devices that convert solar energy into electrical energy. The intensity of light radiation directly affects the amount of power generated. Solar radiation data in various regions can be obtained through the NASA meteorological data query website, or with the help of photovoltaic design software such as PV-SYS and RETScreen.

1.2. Inclination angle of solar cell modules
The data obtained from the weather station is generally the amount of solar radiation on the horizontal plane, which is converted into the amount of radiation on the inclined surface of the photovoltaic array, so that the power generation of the photovoltaic system can be calculated. The optimal tilt angle is related to the latitude of the project location. The approximate experience values are as follows:
A. Latitude 0°~25°, tilt angle equal to latitude
B. Latitude 26°~40°, inclination equal to latitude plus 5°~10°
C. Latitude 41°~55°, inclination equal to latitude plus 10°~15°

1.3. Conversion efficiency of solar cell modules

1.4. System losses. Like all products, during the 25-year life cycle of a photovoltaic power station, the component efficiency and electrical component performance will gradually decrease, and the power generation will decrease year by year. In addition to these natural aging factors, there are also quality issues of components and inverters, circuit layout, dust, series and parallel losses, cable losses and other factors.
In the financial model of a general photovoltaic power station, the system power generation will decrease by about 5% in three years, and the power generation will decrease to 80% after 20 years.