Jump to content

Manually changing meteo data not working CMSAF


Recommended Posts

I am currently working on a project where the client has requested that we use the global horizontal irradiation, horizontal diffuse irradiation and wind temperature from PVGIS CMSAF.

The client gave the following instructions which I followed:

Start with the default PVGIS import “PVGIS:TMY Sarah,Cosmo or NSDRB”

Then go to PVGIS (version 5.1): https://re.jrc.ec.europa.eu/pvg_tools/en/#api_5.1 to download the following monthly data (PVGIS-CMSAF) for the location:

(i) Global horizontal irradiation;

(ii) Diffuse/global ratio (use this to manualy calculate the monthly diffuse horizontal irradiation);

(iii) Temperature;

Then overwrite the first three columns in PVGIS with this external data. Windvelocity and humidity remain unchanged.

I modified the site by going into choose site > open the specific site and changed  the data in monthly meteo.

This gave me a glob hor of 1134,7 a diffhor of 601,1 and an T_Amb of 10,8


Afterwards I ran the Pvsyst however on the main results page I can see that the used data is from the original PVGIS TMY import namely: globhor 1139,7  diffhor 557,4 and T_Amb 10,5 and not the modified version.

Please advice on what went wrong and how I can get Pvsyst to use the modified data.


Link to comment
Share on other sites


You need to regenerate a new .MET file that corresponds to the monthly data (see the example screenshot below). In the site drop-down menu, you should find the site you have saved with modified values. You should then use the new .MET file for the simulation.



Link to comment
Share on other sites

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...