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Agnes Bridel

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  1. If you have Solcast data, you will have to select the Solcast option from the dropdown menu before importing your file. If the issue persists, please feel free to share your weather data at pvsyst@support.com so that we can take a closer look at the issue.
  2. In PVsyst, Meteonorm versions are associated to PVsyst versions. For instance, Meteonorm 8.1 is integrated in PVsyst 7.4.7. Meteonorm 8.2 will be integrated In the upoming PVsyst version 8. It is possible to import Meteonorm weather data manually. You can do so through "Databases > Known format" and select the Meteonorm software option from the dropdown menu.
  3. Hi Nuno, There were indeed a few comparisons done for different weather data sources. This comparison were done only between free sources, explaining why databases like Solargis, Solaranywhere and Solcast were not included. At PVsyst, we try to remain neutral by providing access to different databases without managing the data nor give preference to one or another. For more insights, you may also check out related forum posts to gain insights form other PVsyst users. Best,
  4. Could you please verify that the parameters in "Detailed losses > Aging" are same in both cases and that the "Keeps calculated mismatch values" is activated? If that is already the case, please kindly send your project ("Project > Export the project") to support@pvsyst.comso that we can take a closer look.
  5. The 25-year P75 concept is currently not yet implemented in PVyst and therefore cannot provide a 25 year list of P75 values automatically at the moment.
  6. GlobEff is the effective irradiance in the PV module after taking into account optical losses such as far and near shadings, IAM and soiling losses. When visualizing the loss diagram in PVsyst, you can easily export the values by clicking the "Export" button. This allows you to paste the data into Excel or another spreadsheet application. The exported data provides a detailed breakdown of the losses and energy for each variable, allowing you to reverse engineer the calculations.
  7. The bifacial system is available in the "System" part and is visible when you choose a bifacial module. You can define the bifacial model by clicking on "Bifacial system". The "GlobBak" variable should then appear in the simulation variables list in "Advanced Simulation > Output file".
  8. Currently, it is not possible to integrate PVsyst with external software. However, the development team is working on PVsystCLI (Command Line Interface), which will enable automation and integration with other software tools. This product will be released alongside PVsyst version 8. For more information about PVsystCLI, please visit: Ongoing development of PVsyst 8 and PVsystCLI. Best,
  9. Hi, The "GlobaBak" variable should appear if the bifacial system is activated. Could you please verify if the bifacial system is activated when defining your system?
  10. Hi, GlobInc is the incident global irradiation in the collector plane on the front side. For parameters related to bifacial system, you could refer to the help page https://www.pvsyst.com/help/bifacial_results.htm for the definition of each variable. In general, there is GlobBak that represents the effective irradiance on the rear side. It includes direct and diffuse sky irradiance as well as the irradiance reflected from the ground. For all these three irradiance components, the shading and IAM losses are accounted for. You then have the possibility to export these variables in "Advanced simulation > Output File".
  11. There are different possibilities to import measured data. The PVsyst standard format is the most straightforward way to import these data (see the help page "Meteo Database > Import meteo data > PVsyst standard format for hourly meteo data" for more information). Otherwise, you could also import measured data through "Databases > Custom Import". (see the help page "Meteo Database > Import meteo data > Import ASCII meteo files" for more information).
  12. Could you please share the Vaisala weather data file to support@pvsyst.com so that we can take a closer look at this issue? Thank you in advance!
  13. 1. PVsyst takes into account two effects that contribute to the losses due to PV module aging: The average degradation of the modules expressed by the ‘average degradation factor’. This will give raise to the ‘global degradation factor’, which is the loss expected for a given year of operation. PVsyst will perform the simulation for the full year with a single degradation value calculated at the beginning of the simulation. Therefore this degradation should represent the average degradation for the entire year. The increasing mismatch caused by the different aging of the individual PV modules. The assumption in PVsyst is that the distributions of Impp and Vmpp will broaden with time. This broadening is described by the two factors ‘Imp RMS dispersion’ and ‘Vmp RMS dispersion’. To estimate how this will impact the overall mismatch losses of the strings, PVsyst will use a Monte Carlo approach and generate randomly many PV modules according to the distributions. It will then combine them to strings and calculate the mismatch losses. From this statistical ensemble it will get the estimate of the ‘Mismatch degradation factor’. 2. Running the module degradation factor post-simulation in Excel might overlook interactions between different system components and environmental conditions that PVsyst considers. 3. You have the possiblity to run 25 years simulation using “Aging tool” in “Advanced Simulation”.
  14. While it is possible to load TMY files with PXX into PVsyst, provided that you already have these data in hand, unfortunately it is currently not possible to generate them directly in PVsyst... Best, Agnes
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