solarforecastarbiter.reference_forecasts.forecast.cloud_cover_to_ghi_linear

solarforecastarbiter.reference_forecasts.forecast.cloud_cover_to_ghi_linear(cloud_cover, ghi_clear, offset=35)

Convert cloud cover to GHI using a linear relationship.

0% cloud cover returns ghi_clear.

100% cloud cover returns offset*ghi_clear.

Parameters:

cloud_cover: numeric

Cloud cover in %.

ghi_clear: numeric

GHI under clear sky conditions.

offset: numeric, default 35

Determines the minimum GHI.

Returns:

ghi: numeric

Cloudy sky GHI.

References

Larson et. al. “Day-ahead forecasting of solar power output from photovoltaic plants in the American Southwest” Renewable Energy 91, 11-20 (2016).