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Global Horizontal Irradiance (GHI)

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Global Horizontal Irradiance (GHI) is the total solar radiation incident on a horizontal surface. It is the sum of Direct Normal Irradiance (DNI), Diffuse Horizontal Irradiance, and ground-reflected radiation. HOMER uses Solar GHI to compute flat-panel PV output.

graphics_solar_radiation_nrel

See also

Photovoltaic Panels (PV)

Solar GHI Resource

Direct Normal Irradiance (DNI)