Ahmed El Abagy

Hello, I would like to ask the formula for calculating GlobInc in terms of GlobHor, also in terms of beam radiation, diffuse radiation and ground-reflected radiation. Kindly feedback, when using horizontal plane, why GlobInc is less than GlobHor (e.g. in Cairo, Egypt GlobInc = 1,896.8 kWh/m² but GlobHor = 1,897.5 kWh/m²), i.e. why they are not the same value. Your Faithfully