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PostPosted: Sun Jan 22, 2017 4:51 am 

Joined: Sun Jan 22, 2017 4:44 am
Posts: 1
I am trying to get data downloads from NSRDB to replace Solar Prospector. I now have found the settings for the NSRDB download wizard to get the correct data and have the "Steps to Import a File Downloaded from NSRDB into PVSYST"

I have also downloaded NREL_PSM_5.zip and placed the file in the meteo directory. I also see a Solar Prospector MEF in the same directory but I don't see the NREL_PSM as a choice for hourly data.

How do I '"install" the MEF file so it becomes an import choice?

Thanks,
Gary


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PostPosted: Wed Jan 25, 2017 3:05 am 
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Joined: Tue Oct 18, 2016 3:31 am
Posts: 136
Inside the ZIP file is the MEF file. You will need to extract that into the meteo directory. You will need to have a site created first for your location. Then you will go to Import ASCII meteo file, under ASCII source, select your PSM weather file, change your names if necessary under "Hourly file to be created", and under conversion, select the MEF file (I have named it NREL PSM 5, but you can rename it to anything), click start conversion.

You will want to see 1990 grayed out in reference year. After you convert, view the meteo file and check the quality. You will most often need to implement a time shift. Re-run the conversion by adding the time shift by opening the conversion template and entering the shift under the date tab. Sorry if this was very brief or repetitive.


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PostPosted: Wed Feb 08, 2017 4:05 pm 

Joined: Thu Jan 24, 2013 5:53 pm
Posts: 12
Thank you!


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PostPosted: Wed Mar 01, 2017 10:53 am 
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Joined: Thu Aug 11, 2016 11:22 am
Posts: 39
Dear all,

Please find a related post here :
viewtopic.php?f=18&t=2736


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PostPosted: Wed May 16, 2018 4:13 pm 

Joined: Wed May 16, 2018 3:47 pm
Posts: 3
Dear all,

I am trying to obtain TMY data from the NSRDB to import it into PVSyst. I already got the TMY file and I am following the steps from this link to add it as my meteo data into PVSyst

https://nsrdb.nrel.gov/sites/default/fi ... clnk&gl=ve

But when I finish the 7th step I cannot get the Ok button to turn on and cannot proceed with the conversion, I followed the exact steps by using a TMY.csv on the ASCII source file option and then click "open" on the conversion section.

I get a red message that says "please define a significant comment".

I do not know why this is. Can you please help me out?

Thanks,
Charles


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PostPosted: Tue Jun 19, 2018 8:09 am 

Joined: Wed May 17, 2017 9:13 pm
Posts: 4
Did you try changing the "Format description" to something more descriptive than the default text "New conversion format for meteo ASCII file"?


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PostPosted: Thu Sep 13, 2018 9:26 pm 

Joined: Fri Jul 07, 2017 3:27 pm
Posts: 19
Quote:
Inside the ZIP file is the MEF file. You will need to extract that into the meteo directory. You will need to have a site created first for your location. Then you will go to Import ASCII meteo file, under ASCII source, select your PSM weather file, change your names if necessary under "Hourly file to be created", and under conversion, select the MEF file (I have named it NREL PSM 5, but you can rename it to anything), click start conversion.

You will want to see 1990 grayed out in reference year. After you convert, view the meteo file and check the quality. You will most often need to implement a time shift. Re-run the conversion by adding the time shift by opening the conversion template and entering the shift under the date tab. Sorry if this was very brief or repetitive.
It's not clear to me what time shift is appropriate. I downloaded NSRDB data and did not select "convert UTC to local time". I then used the .MEF file which was posted by solarguru on 10/17/16 which included a shift of 5 hours. My site is located in UTC-5. I'm getting errors that "GlobHor" data is undefined, and also that my time seems mismatched. Does anyone know what the most appropriate way is to treat NSRDB data, specifically PSM v3?


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PostPosted: Tue Sep 25, 2018 7:25 pm 
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Joined: Tue Oct 18, 2016 3:31 am
Posts: 136
Quote:


It's not clear to me what time shift is appropriate. I downloaded NSRDB data and did not select "convert UTC to local time". I then used the .MEF file which was posted by solarguru on 10/17/16 which included a shift of 5 hours. My site is located in UTC-5. I'm getting errors that "GlobHor" data is undefined, and also that my time seems mismatched. Does anyone know what the most appropriate way is to treat NSRDB data, specifically PSM v3?
The result of the time shift is revealed after the conversion has happened. After complete, a box will come up asking for you to inspect the data, click yes, and select "check data quality" tab to see how far off you are, and if adjustment is needed.

If your glob Hor is undefined, it might mean that depending on the variables you imported from NREL, it may not be matching up with the MEF file I provided. You will need to update the MEF to point to the correct columns. When I download PSMv3, I only download the variables I need for PVsyst (GlobHor, DiffHor, Tamb, Wspd) + DNI. When I download a UTC-5 site, and I check "convert to local time" when download NREL PSM, a time shift of 5 hours generally works. If you did not check convert UTC to local time, you may need to do something different. Since I haven't done it with that unchecked, I cant provide any help there.

https://imgur.com/a/1mOXdl6


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PostPosted: Thu Sep 27, 2018 5:40 pm 

Joined: Fri Jul 07, 2017 3:27 pm
Posts: 19
I think I'm getting closer. I had been using the instructions of two different posters on this thread together.

Ok, so I checked "convert UTC to local time" when downloading a site in New York. In my MEF file, I have my time base is universal time and a +5 hour shift entered. I'm still getting an error of "The imported meteo data are shifted by -59 minutes with respect to the Clear Day model." Why might that be?

On the side, I tried having NSRDB leave the data in UTC then I changed the MEF file to have no time shift and I got "The hourly data are not defined. This meteo file is unuseable for simulations!". So, there I go moving backwards again.

Additionally, it was my understanding that the NSRDB PSM v3 data represents instantaneous values (or for some values, averages centered at the time label)? The PVSyst help menu seems to indicate that it is calculating solar position based on the half hour, so a value with a 10am time label is paired with a solar angle at 1030am? Thoughts on what would be most appropriate to account for that? If I brute force trial and error this until I get a green message from PVSyst, am I in the best place, or should I be adding in 30min offsets because I know better than PVSyst?


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PostPosted: Wed Oct 03, 2018 7:52 pm 
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Joined: Tue Oct 18, 2016 3:31 am
Posts: 136
If you are at -59 minutes, add 1 hour to the time shift in the MEF file and re-run. Are you downloading in half hour intervals on the NREL side? This should be unchecked. I just downloaded a NY site (albany) and with a timeshift of 5 hours, the result is 0. See images.
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MEt File IMport albany.jpg
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