predicting the energy yield of solar PV systems. In this study, irradiance models that estimate
Global Plane Irradiance (GPI) from Global Horizontal Irradiance (GHI) measurements for
South African climatic conditions are evaluated. Seven irradiance decomposition models
namely Orgill and Hollands, Erbs, Louche, 𝐑𝐑𝐑𝐑𝐑𝐑𝐑𝐑𝐑𝐑𝐥𝐥𝟏𝟏, 𝐑𝐑𝐑𝐑𝐑𝐑𝐑𝐑𝐑𝐑𝐥𝐥𝟐𝟐,
Disc and Dirint are evaluated as well as combinations of the Isotropic, Sandia, Klucher, Hay …