Presentation Description: On-site measurements are often used along with historical satellite models to develop highly accurate long-term solar resource estimates. However, using only a single satellite model as a reference for a climate adjustment may result in additional uncertainty and financial risk for several reasons. First, individual models may have inconsistent or progressive historical trends due to modeling assumptions. These characteristics could influence the magnitude and/or direction of the climate adjustment. Second, historical satellite models may experience anomalies during comparatively short on-site measurement periods. These possibilities can lead to less accurate long-term solar resource predictions.
The results illustrate the importance of relying on more than one satellite model for on-site data correlation and long-term solar analyses to mitigate the risk of increasing trends/decreasing trends/step changes in reference datasets.