pvlib.irradiance.clearsky_index

pvlib.irradiance.clearsky_index(ghi, clearsky_ghi, max_clearsky_index=2.0)

Calculate the clearsky index.

The clearsky index is the ratio of global to clearsky global irradiance. Negative and non-finite clearsky index values will be truncated to zero.

Parameters:

ghi : numeric

Global horizontal irradiance in W/m^2.

clearsky_ghi : numeric

Modeled clearsky GHI

max_clearsky_index : numeric, default 2.0

Maximum value of the clearsky index. The default, 2.0, allows for over-irradiance events typically seen in sub-hourly data.

Returns:

clearsky_index : numeric

Clearsky index