Dear Team Valentin/ Martin,

 

Is there an option to import actual/current climate data with meteonorm? We would like to use Meteonorm only we find the data outdated, namely 1991 - 2010.

Is this possible with the demo version of Meteonorm? Do you have an explanation for this if possible?

We find the option with PVGIS insufficiently accurate, as you explained to us in our previous question.

 

Thank you in advance!

 

Kind regards,

Remu

Dear Remu,

yes, you can import climate or weather data into PV*SOL via its meteo module Meteosyn (which integrates Meteonorm). See the data format description here:

https://help.valentin-software.com/pvsol/2020/pages/system-type-climate-and-grid/meteosyn/#options

The reason why climate data from 1991 - 2010 is used in Meteonorm is that 1) you always want to use long-term climate data to realistically represent the location's weather "behaviour" over a long period of time, not just e.g. the last five years and 2) at the moment there is no climate data with a more recent period of time in Meteonorm 7.2. For some countries, there is data from 1996-2015, but not for the Netherlands.

See also the difference between weather and climate data, and TMY here:

https://help.valentin-software.com/pvsol/2020/calculation/irradiation/climate-data/#what-are-climate-data-sets-what-does-typical-mean-year-mean

In PVGIS, you get satellite derived climate data in good quality for 10 years time periods (not as secure as 20 years, but ok), also for the Netherlands. This is what I would recommend to you at the moment, as long as Meteonorm has no more recent data. But also keep in mind, that for PV simulation and the reliability of the simulation results, more recent doesn't forcibly mean better.

All the best, kind regards,

Martin

 

Hi!

I tried to import the CSV file from PVGIS but it doesn't work. MeteoSyn only accepts DWD, Meteonorm or WBV files... Do you have a solution?

Hi Reint,

the *.dat file format is the one you can use. Here's a explanation how to prepare the files:

https://help.valentin-software.com/pvsol/2020/pages/system-type-climate-and-grid/meteosyn/#options

Kind regards,

Martin

Hi Martin,

The CSV file that I try to convert to the right *.dat file format contains more data then required. If I would like to prepare the file, do I have to change all 8760 rows by hand?

Hi Reint,

the easiest way would be to import the comma separated values in Excel so that they appear in their own column. Refer to this short guide here : https://support.microsoft.com/en-us/office/import-or-export-text-txt-or-csv-files-5250ac4c-663c-47ce-937b-339e391393ba

The result would look like this:

Then it should be easier to eliminate the columns that you don't need and compile the dat file as required.

Hope that helps, kind regards,

Martin

Thanks! That worked well.