solarforecastarbiter.reference_forecasts.forecast.cloud_cover_to_ghi_linear

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

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).