The Case for Custom TMYs: Examples Using the NSRDB: Preprint

Research output: Contribution to conferencePaper


A typical meteorological year (TMY) essentially represents an hourly compilation of median months constructed using multiyear data sets. Although TMYs are generated from global horizontal irradiance, they are used in photovoltaic (PV) modeling for various plane-of-array (POA) representations. This paper demonstrates that a POA TMY generated with corresponding POA irradiance time-series information produces significantly different results than a POA TMY generated by transposing a TMY data set. In some months, the differences can be more than 3%. These results point to the need for generating TMYs using POA irradiance time series representing the orientation at which PV panels will be deployed.
Original languageAmerican English
Number of pages9
StatePublished - 2019
Event46th IEEE Photovoltaic Specialists Conference (PVSC 46) - Chicago, Illinois
Duration: 16 Jun 201921 Jun 2019


Conference46th IEEE Photovoltaic Specialists Conference (PVSC 46)
CityChicago, Illinois

Bibliographical note

See NREL/CP-5D00-76337 for paper as published in IEEE proceedings

NREL Publication Number

  • NREL/CP-5D00-74063


  • National Solar Radiation Database
  • photovoltaic
  • plane of array
  • POA
  • PV
  • TMY
  • typical meteorological year


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