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Global Horizontal Irradiance (GHI)

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


See also

Photovoltaic Panels (PV)

Solar GHI Resource


Image source: RReDC Glossary of Solar Radiation Resource Terms, NREL Renewable Resource Data Center from