Solar Radiation by State

When designing off grid solar system, knowing the amount of sunlight is critical to your design calculations.  Here are some great solar radiation summary sheets that I reference for major locations in the US. These solar radiation sheets are organized by state so please download the data you need for your project location.

These PDF files were all located on an NREL website and were produced by NREL.  I’m posting copies of them here to help ensure this data will always be easy to find and will remain in the public domain.