Directly Assigning Weather File Elements in PySAM without using a weather file

  • Matan
  • Topic Author
More
17 Jun 2020 19:36 #8318 by Matan
Directly Assigning Weather File Elements in PySAM without using a weather file was created by Matan
Hello!

I am wondering weather is possible to directly run the PVwatts model without using a weather file, and directly assigning the sequences of weather data to the SolarResource.solar_resource_data attribute. I tried the following, but I always get Annual Energy = 0, and all elements of ac out = 0. What am I doing wrong? Or is what I am trying to do not possible.
import PySAM.Pvwattsv7 as pv

model = pv.default('PVWattsNone')

wspd = [0, 0, 0.83... # 8760 elements of data. ie len(wspd = 8760)
tdry = [10.3, 10.54...
dn = [0, 0...
dh = [0, 0...
year = [2019, 2019 ...
month = [6, 6 ...
day = [1, 1 ...
hour = [0, 0, ...
minute = [0, 15 ...

model.SolarResource.assign({'solar_resource_data':{'dn':dn,
                                                   'df':dh,
                                                   'tdry':tdry,
                                                   'wspd':wspd,
                                                   'lat':51.4,
                                                   'lon':1.1,
                                                   'tz':0,
                                                   'Elevation':16,
                                                   'Year':year,
                                                   'Month':month,
                                                   'Day':day,
                                                   'Hour':hour,
                                                   'Minute':minute,
                                                   'albedo':0.5}})
   
model.execute(1)
model.ac_annual #0.0 kWh
thank you,

Matan


Please Log in or Create an account to join the conversation.

  • Paul Gilman
More
17 Jun 2020 23:05 #8320 by Paul Gilman
Replied by Paul Gilman on topic Directly Assigning Weather File Elements in PySAM without using a weather file
Hi Matan,

You're on the right track.

The code beginning at this line in common.cpp of the SSC source code should help you see how to format the table correctly.

Best regards,
Paul.

Please Log in or Create an account to join the conversation.

  • Matan
  • Topic Author
More
17 Jun 2020 23:08 #8321 by Matan
Replied by Matan on topic Directly Assigning Weather File Elements in PySAM without using a weather file
Hello Paul,

Thank you for your response. I figured out my problem. I used 'Elevation' as a key instead of 'elev'. It works now.

Best,

Matan

Please Log in or Create an account to join the conversation.

  • Matan
  • Topic Author
More
02 Jul 2020 23:44 - 06 Jul 2020 15:52 #8388 by Matan
Replied by Matan on topic Directly Assigning Weather File Elements in PySAM without using a weather file
Hello ,

I have another followup question to this! Reading through the documentation for PVwattsV7:  nrel-pysam.readthedocs.io/en/2.0.2/modules/Pvwattsv7.html  , I am not sure where I would input "snow"-depth.

I am using the direct assignment method to assign weather data, rather than reading from a weather file. Looking at the SolarResource.solar_resource_data, I see that "snow" (nor "albedo") is included in the 'info' . Can I assign snow and albedo as part of a the "solar_resource_data" dictionary?



Best,

Matan
Attachments:
Last edit: 06 Jul 2020 15:52 by Paul Gilman.

Please Log in or Create an account to join the conversation.

  • Paul Gilman
More
06 Jul 2020 15:56 #8402 by Paul Gilman
Replied by Paul Gilman on topic Directly Assigning Weather File Elements in PySAM without using a weather file
Hi Matan,

You can use the documentation of solar_resource_data for pvsamv1 as a reference: nrel-pysam.readthedocs.io/en/2.0.2/modules/Pvsamv1.html.

Best regards,
Paul.

Please Log in or Create an account to join the conversation.

Moderators: Paul Gilman
Powered by Kunena Forum

NREL is a national laboratory of the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, operated by the Alliance for Sustainable Energy, LLC.

NREL Home

NREL Research

Follow NREL

NREL is a national laboratory of the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, operated by the Alliance for Sustainable Energy, LLC.