While weather data is just one of many inputs into PV modeling tools, data accuracy plays a key role in reducing PV project uncertainty and risk. As a result, we frequently are asked “How accurate is SolarAnywhere® Data?” This is a question we take seriously. In fact, whenever new SolarAnywhere versions are released, a rigorous testing protocol is followed, and the results are published. To augment our internal processes, Clean Power Research recently worked with Fraunhofer Institute for Solar Energy Systems ISE on an independent validation of SolarAnywhere data, and the results are now available for review.
In this research, Fraunhofer ISE compared SolarAnywhere global horizontal irradiance (GHI) data with data from 22 high-quality ground measurement stations in Germany. Fraunhofer ISE found that SolarAnywhere performed as expected for satellite-derived GHI, with no visible trend towards a systematic over- or underestimation, and no observed seasonality bias. The measurement stations used in the Fraunhofer ISE study include both temperate and continental climate classifications, which are applicable across much of Europe. For areas with sunnier and warmer climates with more clear-sky days, accuracy will likely be even better.
Just as importantly, the Fraunhofer ISE study results are consistent with Clean Power Research’s internal validation. This is a strong indication that the SolarAnywhere model—which is applied consistently in space and time—is reliably accurate no matter the location.
The Fraunhofer Institute for Solar Energy Systems ISE is the largest solar research institute in Europe, with longstanding expertise in satellite-based solar irradiance retrieval and validation. To access a summary of the Fraunhofer ISE validation, or request a copy of the full report, click here.