Competitor comparisons

Compare Solcast historical and TMY products to Solargis, Meteonorm, Vaisala, and free data sources

How does Solcast compare to other data sources?

Our goal is to make your work easier. Part of this is making the best data, making it fast and easy for you to download, and giving you free credits to get you started. But we also want to make it easier for you to understand how we compare to some other data providers.

Here’s a comparison of Solcast against some commonly used datasets in the solar development community; Solargis, Meteonorm, Vaisala, NREL, and PVGIS.

  Solcast Solargis Meteonorm Vaisala
Free trial with instant access and data download?
Price point $$ $$$$ $ $$
Download wait time 1-9 minutes 5 minutes to 48 hours 1 minute 5 minutes to 24 hours
Mean Bias Error (GHI) 0.0% 0.0% N/A 3.1%
Standard Deviation of Bias (GHI) ± 2.0% ± 2.9% N/A ± 4.9%
90% of sites have bias (GHI) smaller than ± 2.5% ± 4.6% N/A Not published
Mean RMSE (GHI) 16.5% 18.0% N/A 18.47%
Comprehensive, global, independent validation
Validation Sites 46 220 N/A 196
Satellite based estimation as primary method
Global Coverage
Resolution of satellite data used 1-2 km 3-4 km 2-8 km 3 km
10+ years of satellite data at full temporal resolution
Ignores older, less reliable satellites
Suitable for use in steep mountain terrain with local relief over 1000m

Free sources comparison

  Solcast NSRDB PVGIS
Download wait time 1-9 minutes 1 minute 1 minute
Mean Bias Error (GHI) 0.0% 0.3% 0.7%
Bias Deviation (GHI) ± 2.0% ± 2.7% ± 3.2%
90% of sites have bias (GHI) smaller than ± 2.5% Not Published Not Published
Mean RMSE (GHI) 16.5% 22.9% Not Published
Comprehensive, global, independent validation
Validation Sites 46 9 22
Satellite based estimation as primary method
Global Coverage
Resolution of satellite data used 1-2 km 4-10 km 4 km
10+ years of satellite data at full temporal resolution
Ignores older, less reliable satellites

Test now, free

Get free historical data credits when you sign up, so you can try our data for yourself. You can download data automatically within around 1 to 9 minutes of submitting your request.