Because the sun's altitude angle is changing over the same day, the tilt angle of the PV array at different time to receive the maximum solar radiation is also changing. Fixed type solar bracket array is usually chosen to receive an angle of maximum radiation throughout the year, While the adjustable solar bracket can adjust the angle to increase power generation in different months or different seasons. Taking a region of Qinghai as an example, Table 1 lists the amount of radiation (kWh / m2) on the slopes of 0 ° to 50 °. When the tilt angle of 37 ° on the inclined surface of the total annual radiation is the largest
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Look at the best tilt angle per month, which is the smallest in June, the maximum amount of radiation received When the solar bracket is horizontal. This is because the north area of Summer Tropic of Cancer noon sun height angle to reach the maximum of the year (The greater the solar elevation angle, the greater the amount of radiation received per unit area).
Summer solstice noon sun height angle
To noon of June 22 as the center, the sun's altitude angle decreases gradually with time on both sides, and the best tilt angle of solar bracket increases gradually. October to March the following year in 40 ° above, of which November to the following year in February at 50 ° or more. Table 2 lists the best tilt angles for solar bracket in per month of this area.
If the solar bracket adjusts two times every year, then from October to March the following year for an angle, when without regard to land conditions in the case. this angle can be set a large angle as much as possible in the within the scope of "Site control index of photovoltaic power plant project "
April to August each year for an angle, it also takes the above area as an example, the best angle is 9 °. If you don’t want to increase the additional land, you can also choose program from September to March 37 °the following year or April to September 9 °. At this time the annual slope of the total annual radiation is 2310kWh / m2, it can increase about 3.6% of the power generation than the non-adjustable solar bracket
Adjustable solar bracket will slightly increase the bracket cost and labor costs, how to optimize the power generation of tunable solar stents, it depends on the final project revenue analysis.
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