Installation method: adjustable inclination - Fixed 

Material: hot dip galvanized steel / Zn-Al-Mg  steel / weather resistant steel 

Origin: Tianjin Jinghai 

        The fixed tilt angle adjustable type refers to regularly adjusting the tilt angle of the fixed support at the turning point of the change of the solar incidence angle to increase the direct absorption of sunlight and increase the power generation with a slight increase in cost. The fixed adjustable type is to adjust the angle in different months or seasons on the basis of the fixed type, so as to improve the power generation. 

For example: 

        Take a region in Qinghai as an example 

        Table 1 lists the amount of radiation (kWh / m2) on the inclined plane for each month from 0 ° to 50 °.

        It can be concluded that when the inclination angle is between 36-38 °, the annual total radiation on the inclined plane is the largest. 

Table 1  

        Let's look at the best tilt angle every month. The best tilt angle in June is the smallest, and the radiation received by the photovoltaic panel is the largest when it is horizontal. This is because the noon solar height angle in the area north of the Tropic of cancer reaches the maximum value in a year (the solar height angle is large, the heating area is small, the light and heat are concentrated, and more solar radiation is obtained, that is, the larger the solar height angle is, The greater the amount of radiation received per unit area).

Table 2 noon solar altitude angle on summer solstice 

        The angle of the photovoltaic plate gradually increases from the noon of the second month of the year to the noon of the second month of the year, and gradually decreases with the height of the solar plate above 40 ° from the second month of the year to the second month of the year. 

        Table 2 lists the best inclination angles of each moonlight volt in this area. If the scheme of adjusting twice a year is selected, it is an angle from October to march of the next year. This angle can be as large as possible within the scope of land use control index of photovoltaic power station project without considering land factors. From April to August every year, the best angle is 9 °. 

        If you do not want to add additional land, you can also choose the scheme of 37 ° from September to march of the next year and 9 ° from April to September of the next year. At this time, the total radiation of the annual inclined plane in the previous year is 2310kwh / m2, which can increase the power generation by about 3.6% compared with that without adjustment. However, the fixed and adjustable type will slightly increase the support cost and labor cost. How to optimize the benefits of fixed and adjustable power generation should also be analyzed from the final project income.