The author received a consultation: for a project in Guangxi, the yield (referring to the yield per kilowatt, the same below) of electricity generated by following the slope is surprisingly slightly higher than that when arranged directly facing south.
After conducting Production calculations for two layout plans using Candela3D and PVsyst software, the Simulate results have verified the correctness of the conclusions.
What exactly is the reason for that?
The author has conducted an analysis on the actual terrain layout of the project, and the results are as follows:
In the table above, the four normals highlighted in red account for nearly 70% of the total. Next, we will calculate the actual tilt and azimuth angles of the array for these four normals, using both due south and downslope arrangements, and employ PVsyst to compute the annual total radiation.
It can be observed that for the aforementioned four orientations, when arranged facing directly south, the total annual radiation is lower than that when arranged following the slope.
Illustrate:
1) Based on the slope angle and aspect, the north-south and east-west slope angles can be calculated. For details, see Candela3D Terrain Analysis - Calculator.
2) The azimuthal angle of the actual tilt for the south-facing arrangement is calculated using PVsyst.
3) The annual total radiation under different actual tilt azimuth angles is also calculated using PVsyst.
So, can it also be established for other regions?
Taking Togtoh in the northern region as an example, the tilt angle is adjusted from 17° to 30°.
It can be seen that for the Togtoh Project, the total annual radiation of the south-facing arrangement is significantly better than that of the slope-facing arrangement.
Therefore, the specific question of whose production is higher is related to the location of the project. Generally speaking:
The higher the latitude (correspondingly, the higher the Tilt, and in the case of China, the proportion of direct radiation is also relatively high), the higher the Production when arranged directly facing south;
The lower the latitude (corresponding to a lower inclination angle, and in the case of China, the proportion of direct radiation is also relatively small), the smaller the difference in production between a direct south orientation and a following face orientation. In fact, the production of the following face orientation may even be higher.
The previous text mainly uses PVsyst for analysis, but the same conclusion can also be drawn using Candela3D.
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