Fresh Questions, Practical Answers: PVsyst Q&A Series #3

1. There is a discrepancy between the photovoltaic plane radiation amount in the Report and the photovoltaic plane radiation amount in the Orientation. Why? [Answer from Teacher Chen]: As shown in Figure 1, the project site is in Hangzhou, and the source of meteorological data is Meteonorm7.1 software. The tilt angle for photovoltaic installation is 25°. In the Oritentation optimal tilt angle selection interface, the software itself only enables users to adjust the tilt and azimuth angles, facilitating a quick judgment of the optimal tilt and azimuth angles. However, the specific radiation values are approximate. As shown in Figure 3, the annual radiation amount is 1263kWh/m2. The radiation value obtained after simulation as shown in Figure 4 is an accurate value. As shown in the fourth column of Figure 4, the annual radiation amount is 1256.6kWh/m2, so this value should be used as the standard. ▲Figure 1 ▲Figure 2 2.…