The normal grid-connected photovoltaic power generation array should be facing south, and the dip angle should be slightly lower than the local geographic latitude angle. However, in some scenes, due to blocking the roof orientation of the building, etc., it is unable to meet the limit of the true south orientation or the angle of the roof of the building. When the optimal inclination design cannot be met, what is the more important inclination and orientation of the photovoltaic array?
The author used PVSYST to analyze the solar radiation resources and different inclination and orientation of the country (see the table below). The analysis results show that:
1. The influence of the inclination angle on the solar radiation is much higher than the influence of the orientation. Therefore, for an environment where the inclination or orientation must be changed, it is better to change the orientation and maintain the inclination.
2. The influence of the orientation of the status area on radiation is relatively low. For example, in Sanya, the optimal inclination angle should be about 18 degrees, and if the inclination angle is 8 degrees, its solar radiation will be reduced by about 0.4% from the optimal inclination angle surface, and if the optimal inclination angle is maintained, but facing east or west At 10 degrees, there is little difference in the amount of solar radiation obtained.
3. For regions with good radiation resources, the impact of dip angle on radiation is much greater than that of regions with relatively poor radiation resources. For example, in Jiuquan area, the optimal inclination angle should be about 40 degrees, and if the inclination angle is 30 degrees, its solar radiation will be reduced by about 1.2% compared with the optimal inclination angle surface, and if the optimal inclination angle is maintained, but facing east or west 10 degrees, the amount of solar radiation obtained will be reduced by about 0.3%.
4. The impact of the inclination of high latitude areas on radiation is higher than that of low latitude areas.
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