Importing Data from Meteonorm

[jfreeman]

Hello,

I'm trying to create a new site in PVsyst 6. I can get to the site creation page, but then it won't let me proceed until I import data from Meteonorm or NASA, and I cannot find how to do that.

Thank you,

Janine

[André Mermoud]

For creating a new site in monthly values:

In "DataBases" / "Geographical Sites" / "New":

- You define the coordinates of the site, site name, country, etc (you can do that using the Google map),

- On the first page you choose the data source (Meteonorm or Nasa-SSE), and you push the button "Import". This loads the monthly values (second page).

- PVsyst will prompt you for saving the site when you will exit by OK.

[jfreeman]

Thank you, that is very helpful.

Before, I was trying to get to this dialog through Tools -> Import ASCII Hourly File -> Open [site] -> New Site. When getting to the dialog box this way, the option to import from NASA-SSE or Meteonorm does not show up, which was confusing me. Otherwise, it looks identical to the dialog box that you pointed me to in your response.

[majdfayyad]

Hello,

How can we alter monthly measured DNI for a specified site?

Many thanks

[André Mermoud]

It is not possible directly in PVsyst (and probably in any other software).

PVsyst is based on the Diffuse part. The DNI is computed in hourly values from the global and the diffuse.

The DNI is defined on a monthly basis only as a sum of these hourly values.

Now the generation of hourly values is performed using the synthetic generation model.

This complex model is based on the Horizontal global (and possibly the specified Diffuse). We don't have any model for generating hourly values from monthly DNI data.

[camapa]

Hi,

When we import monthly data from meteonorm, the source is indicated in the format: Meteonorm 7.1 (YYYY-ZZZZ), Sat=XX%, where YYYY and ZZZZ are the first and last years of satellite data averaged for the site. However, it's not clear for me what XX means. What is it?

Tks

[André Mermoud]

This is the fraction of "information" taken from satellite data (with respect to ground measurements of nearby stations).