Fresh Questions, Practical Answers: PVsyst Q&A Series #20

1. Regarding the settings of circumsolar scattering in different versions, what impact do they have on the simulation results? Answer: In previous PVsyst versions (prior to 6.8), the circumsolar scattering was included in the scattering, whereas versions after 7.0 handle it separately. Especially in application scenarios with large tilts and vertical installations, separate treatment helps improve the accuracy of simulation results. Taking the vertical installation method of a PV module in Northern Europe as an example, the two simulation results of ambient solar radiation included in the scattering and treated separately are shown below. Different settings result in a difference of about 0.34% in hours of production. After separate treatment, the yield is higher. 2. How to set the LID and annual attenuation of PV modules? Answer: LID stands for Light Induced Degradation, which is related to material aging and annual degradation. These two factors are set separately in the…