pvlib.irradiance.clearsky_index¶
-
pvlib.irradiance.
clearsky_index
(ghi, clearsky_ghi, 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 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