Jump to content

TMY vs Synthetic meteo files


Recommended Posts

Hello, everyone:

I would like to ask something about the meteo files. I'm studying some locations using NREL / NSRDB TMY, importing the information directly from PVsyst. After creating the .sit files the software also creates an "...NREL_TMY.MET" file. But after that I can also create a synthetic meteo file for that site.

My question is whether it's convenient or not to create that syntehtic file, because it always results in a higher yield than the TMY file. I wonder if that's the right procedure or if I get fake results by doing it.

Thanks in advance!

Link to comment
Share on other sites

  • 1 year later...


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. 








Link to comment
Share on other sites

  • 1 year later...

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Create New...