The Impact of Plane-of-Array-Based TMYs on Solar Resource for PV Applications: Preprint

Research output: Contribution to conferencePaper


This study attempts to apprise stakeholders about the accurate use of a typical meteorological year (TMY) data set for decision-making that could potentially speed up the acceptance and deployment of projects and reduce risks to financiers and developers. A TMY data set represents hourly concatenation of 12 typical meteorological months constructed using multiyear data sets. Typically, TMY data sets are constructed under horizonal irradiance conditions that are then used in photovoltaic (PV) performance models for available energy calculations in a location after transposing the data to represent a desired plane-of-array (POA) orientation. In this study, we attempt to show 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% for irradiance and energy yield. These results point to the need for generating TMY data sets using POA irradiance time series representing the orientation at which PV panels will be deployed.
Original languageAmerican English
Number of pages7
StatePublished - 2019
Event2019 European Photovoltaic Specialists Conference (EU PVSEC) - Marseille, France
Duration: 9 Sep 201913 Sep 2019


Conference2019 European Photovoltaic Specialists Conference (EU PVSEC)
CityMarseille, France

NREL Publication Number

  • NREL/CP-5D00-74768


  • GHI
  • global horizontal irradiance
  • National Solar Radiation Database
  • plane of array
  • POA
  • TGY
  • TMY
  • typical GHI year
  • typical meteorological year


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