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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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?

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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.

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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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justaskingonequ...
Downloaded Wind Resource Files Lead to Zero Energy Production in SAM

Hi,

For the downloadable wind resource files from the Wind Toolkit in SAM, the simulation will always lead to zero energy production for some regions.

Let's take, for example: lat 35.98 lon 101.75, lat 39.74 lon 104.99 or lat 35 lon 101, which are all located in the upper region of Texas just north of Amarillo, will lead to zero energy production in simulations.

However, just south of that, at a random lat 31.29 lon 100.72, which is still in Texas, will lead to proper values.

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Sina90
Sina90's picture
TM2

Hi Guys,

I have some weather files in TM2 format, how can I convert them into formats that is readable by SAM?

Many Thanks,

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MatthewSteen
MatthewSteen's picture
Downloaded Wind Resource Data Missing Pressure Data

Using a wind resource file downloaded from the WIND Toolkit in SAM does not seem to work in 2016.3.14. It appears that the pressure column is missing data since every row is 0 atm. This results in zero kWh production. I've also noticed that there are more than 8765 rows in the downloaded data compared to the representative typical wind resource files.

Matt Steen
Building Performance Engineer
Ambient Energy

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