Is it possible to do a bulk download of weather data for all locations across the U.S. using SAM? If not, what is the most efficient way to download weather data for multiple locations in SAM?
For a few locations, you could use the Multiple locations option on the Location and Resource page.
Otherwise, to download a large number of weather files from the NREL National Solar Radiation Database (NSRDB), you could use the NSRDB API: developer.nrel.gov/docs/solar/nsrdb/