pvlib.irradiance.poa_horizontal_ratio

pvlib.irradiance.poa_horizontal_ratio(surface_tilt, surface_azimuth, solar_zenith, solar_azimuth)

Calculates the ratio of the beam components of the plane of array irradiance and the horizontal irradiance.

Input all angles in degrees.

Parameters:

surface_tilt : float or Series.

Panel tilt from horizontal.

surface_azimuth : float or Series.

Panel azimuth from north.

solar_zenith : float or Series.

Solar zenith angle.

solar_azimuth : float or Series.

Solar azimuth angle.

Returns:

float or Series. Ratio of the plane of array irradiance to the

horizontal plane irradiance