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In the realm of solar energy, POA models are extensively used to determine the quantity of solar radiation on inclined surfaces or solar photovoltaic (PV) panels. The study validates seventeen transposition or plane of array (POA) solar radiation models with various complexes, namely: Isotropic, Perez-Driesse, Hay-Davies, Klucher, Reindl, King, and Perez (the Perez model contains 11 sets of equations based on data from unique geographical regions). Three study sites in various climatic zones — Mthatha, George, and Irene — are considered during the year-long examination. A pyranometer tilted 30° from the horizontal establishes the reference POA measurements. It is discovered that all models accurately predict POA irradiance at the three locations, albeit to different extents. The Perez model with the France 1988 coefficients performs best at Irene and George stations, whereas the Isotropic model performs best at the Mthatha station. Transposition models underestimate POA irradiance at Irene and George but overestimate it at Mthatha. The study’s findings may be employed in PV simulation tools to improve PV system modeling, monitoring, and forecasting in South Africa.

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Assessment of Plane of Array Irradiance Models in South Africa

  • 会议论文

  • 发表日期：

    2026年

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  • Brighton Mabasa,
  • Kristy Langerman,
  • Hartmut Winkler

摘要

In the realm of solar energy, POA models are extensively used to determine the quantity of solar radiation on inclined surfaces or solar photovoltaic (PV) panels. The study validates seventeen transposition or plane of array (POA) solar radiation models with various complexes, namely: Isotropic, Perez-Driesse, Hay-Davies, Klucher, Reindl, King, and Perez (the Perez model contains 11 sets of equations based on data from unique geographical regions). Three study sites in various climatic zones — Mthatha, George, and Irene — are considered during the year-long examination. A pyranometer tilted 30° from the horizontal establishes the reference POA measurements. It is discovered that all models accurately predict POA irradiance at the three locations, albeit to different extents. The Perez model with the France 1988 coefficients performs best at Irene and George stations, whereas the Isotropic model performs best at the Mthatha station. Transposition models underestimate POA irradiance at Irene and George but overestimate it at Mthatha. The study’s findings may be employed in PV simulation tools to improve PV system modeling, monitoring, and forecasting in South Africa.