Emanuel Rodriguez

Hi, I am having a similar problem. The file export from PVCASE in .PVC is then imported in PVSyst upside down, I mean where it should be north it is south. Do you know how can I deal with this issue? Best regards, Emanuel

I wrote the PVSyst support by e-mail and got the following response:

They shouldn't be so different, could you please share values from ordinary simulation and the CSV files o XLSX from batch simulation?

Dear PVsyst Team, I have run some new simulations with the new 7.3.1 PVsyst version and found some problems with the Global incident Irradiation. The system has 6MW and one axis N-S trackers, in its simulations reports the Global Incident (GlobInc) value is very close to the Global Horizontal (GlobHrz) irradiation, I am getting a +1.2% * GlobHrz gain now but previously I got around +23.4%* GlobHrz that sound more sensible. I did an advanced simulation to check the hourly values. However, I cannot see any significant difference of GlobInc from GlobHrz during morning and afternoon. Do you know what could be happening? It is like the trackers are not moving or moving very slightly. I have attached 2 images showing the difference between before and after version 7.3.1 and a PDF showing the hourly values of the after version 7.3.1 where you can see there is almost no difference between GlobInc and GlobHrz. Look forward to hearing from you Best regards, Project_VC7_HourlyRes_1.pdf

Thank you very much dtarin!

Hi, Some Solar Databases provide a TMY meteo data with P90 instead a value for interannual variability. I am not sure how to estimate the P90 production with this TMY P90 data. Could you please help me? I was thinking to simulate with TMY P90 meteo data as usual but then in the "Energy Management" menu set 0% for "interannual variability" and get the Energy P90 marked in the image below. This way I would be getting the uncertainties of the other sources such as PV modules, inverters, soiling and module quality loss and long term degradation. Do you have any experience or opinion on this matter? Thanks in advance. Emanuel

Hi ASBRIC, I think you are doing it right. When you create a .SIT file you are just setting the place downloading just monthly meteo data, see image 1. So you get GHI, DHI, Tamb, Wind velocity and RHumidity. So PVsyst generates a synthetic meteo file hour by hour in order to calculate the simulation. See image below I do not know how can Pvsyst simulate the system (mainly losses) if no hourly calculations are performed. How did you get results without creating a .SIT file? As far as I know, the TMY is supposed to provide the "same data" (different format) as the .MET file. So the creation of a .MET form a TMY is just fomat conversion. To sum up, if you have a TMY file you should import it, create the .SIT and the .MET files after that you should run the simulation selecting the meteo data from .MET. BR, Emanuel