Weather Data

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Paul Gilman
Weather Data

Are you looking for weather data for a location not covered by the NSRDB?

For information about where to find weather data to use with SAM, please see the Weather Page on SAM website:

https://sam.nrel.gov/weather

You might also be interested in a tool developed by Angus King, and described in this post:

https://sam.nrel.gov/node/71040

Best regards,
Paul.

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maiconbastos
Longitude e latitude não especificado

I created a typical meteorological year to simulate a system of energy generation by solar concentration, but when I put to run the file is giving an error of Longitude and Latitude unspecified, I tried everything and I can not solve this error, I tried to even create The file in the 2013 version.
I am using Excel to build the file.
I would have some other software for editing the files.
Thank you in advance.

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tcoyne2
Potential Problem with Resource Azimuth

While running a CSP model (steam or molten salt, doesn't seem to matter which), I noticed that some sites have what seems to me to be an odd artifact with respect to the solar azimuth. I am using the built in locations on the SAM program. For example, if you use India (Trivandrum) and plot the time series, the resource solar azimuth really spikes in March - it almost looks like the data is inverted. I am not seeing this with every location, but I randomly clicked around and noticed the same artifact with Sri Lanka (Kankesanturai) and UAE (Abu Dhabi) - there probably are a few more.

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ssgouridis
Problems with using custom weather data

Hello,

I would like to use SAM with custom weather data.

To do so, I have first copied a sample CSV file from the library.

When I use the copied file unedited, the simulation proceeds normally.

When I open the file with Excel and save it as a CSV even though I have not done any other change (i.e. the data are exactly the same) the simulation fails. I also tried another software - Open Tables but with the same results.

5 posts / 0 new
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ivonnepena
Read srw correctly

Hi Paul,

I am trying to read a srw wind weather file in SAM store in my laptop. I am using OX. These are the steps I followed:

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Paul Gilman
Leap Years

I have some single year input data files (in EPW format) for 2016 to run in SAM. I can see in the SAM help notes it says: “When you run a simulation, the performance model uses hourly data from the weather file to calculate the quantity of electricity generated by the system in one year by summing the 8,760 hourly generation values.” But 2016 is a leap year and has 8784 hours. Is there any way to get SAM to read in all 366 days of data?

3 posts / 0 new
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Ehab Issa
Ehab Issa's picture
Error Message in PV (Detailed)- weather data

Hello,
I downloaded weather data for Egypt from Energy Plus weather format (Africa WMO Region 1--EGY_Alexandria.623180_ETMY.epw), lately when I load weather data and run simulation this message appear and simulation faild.

**exec fail(pvsamv1): failed to process irradiation on surface 1 (code: -1) [y:1985 m:4 d:24 h:11] Simulation pvsamv1 failed.**

How I solve this problem

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Paul Gilman
30-minute Simulations

Is it possible to set the ‘data’ results to be listed in 30 minute intervals instead of 60 minute?

Yes, SAM's solar models can run simulations in up to 1-minute intervals. The simulation time step is determined by the weather data, so to run 30-minute simulations you will need 30-minute weather data.

NREL's NSRDB provides 30-minute data, so if you do not have your own data, you can download it from:

https://nsrdb.nrel.gov/nsrdb-viewer

Best regards,
Paul.

1 post / 0 new
Paul Gilman
Daily Weather Data in SAM?

I have an Excel sheet weather data for Maan Jordan, where the parameters (GHI, DNI, Ta...) are daily, not hourly. I would like to convert this weather data file from excel format into TMY3 format, so I can use it in the simulation on SAM. The version of SAM is 2016.3.14. Could you please tell me how to do this conversion?

SAM requires a weather file with at least hourly data, so it will not work with daily data.

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justaskingonequ...
Wind Resource at More Hub Heights or Shear Coefficient

Hi,

The downloadable wind resource files from the online NREL WIND Toolkit features only hub height of 100m.
Using those files, I will have to enter a shear coefficient in the Wind Turbine section since SAM will not be able to calculate it without more information from other hub heights.

Is there an average shear coefficient or wind resource files for more hub heights that I can use to representatively simulate over Texas, U.S.?

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