Cole Noble

Thanks, Michele, for your response. So strangely, I am importing both houlry GHI and temperature, in which case I woulnd't expect, "Perez, Meteonorm" to show up under the models used in the PVsyst report, but rather, "Erbs". Do you have any ideas on why this might be the case? Thanks!

I am importing GHI into PVsyst and need to rely on the decomposition model for DHI. From what I understand, PVsyst uses the DIRINT model (Perez-based) for decomposition and then uses a Meteonorm algorithm for creating the synthetic (hourly) data. This would explain why "Diffuse Perez, Meteonorm" shows up on my reports (even if I am not using any Meteonorm-related irradiation). 1. Is my understanding correct? 2. If my understanding is correct, if I am importing hourly GHI data, why would the Meteonorm synthetic model still be used? The GHI data is at an hourly granularity already; why not just use DIRINT? Perhaps PVsyst uses the label "Perez, Meteonorm" for DIRINT? Even if no synthetic hourly data is created? 3. I don't see a way of changing the decomposition model in PVsyst to Erbs instead of DIRINT. Is this not possible? Thanks! Cole