P50/P90 Analysis - Weather data base files

  • apawankr
  • Topic Author
More
22 Mar 2013 09:45 #1463 by apawankr
P50/P90 Analysis - Weather data base files was created by apawankr
We are performing a P50/P90 analysis for one of the CSP plants near Jodhpur in Rajasthan, India. We have considered a nearby location Jaipur for carrying out the analysis. We note that the available weather data is for 7 years for this location.

Further, while carrying out the analysis we note that the P50/P90 results are not being tabulated. The error given is that the data is insufficient to carry out the P90 analysis.

Can you please suggest how to handle this limited input data using SAM to carry out the P50/P90 analysis.

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

  • Paul Gilman
More
28 Mar 2013 21:19 #1464 by Paul Gilman
Replied by Paul Gilman on topic P50/P90 Analysis - Weather data base files
Hello,

SAM's P50/P90 analysis feature requires at least 15 years of data, which we consider to be the absolute minimum number of years for which it makes sense to do this kind of statistical analysis.

If you want to calculate exceedance probabilities over a period of fewer than 15 years, you may want to consider doing the calculation outside of SAM, or writing a SamUL script to do the calculation in SAM. With only 7 years of values, the calculations should be straightforward to make in a spreadsheet.

Best regards,
Paul.

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

  • GeoModel Solar
More
02 Apr 2013 10:06 #1465 by GeoModel Solar
Replied by GeoModel Solar on topic P50/P90 Analysis - Weather data base files
Also worth mentioning is that if a P90 analysis is done for a location near Jodhpur, using a dataset for Jaipur (approx. 300 kms away), the P90 value has to be very conservative. This by no means would be appreciated by any project developer. Looking at some DNI maps, it appears that DNI in Jaipur is approx 15% lower than DNI in Jodhpur.

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.