pvlib.irradiance.clearsky_index#

pvlib.irradiance.clearsky_index(ghi, ghi_clear, max_clearsky_index=2.0)[source]#

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. See ghi. [Wm⁻²]
ghi_clear (numeric) –
Modeled clearsky GHI. See ghi_clear. [Wm⁻²]

Changed in version 0.11.2: Renamed from ghi_clearsky to ghi_clear.
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. [unitless]

Examples using `pvlib.irradiance.clearsky_index`#