Solar resource calculator
Solar irradiance by location
Look up measured solar resource — global horizontal (GHI) and direct normal (DNI) irradiance — for any US ZIP code, straight from NREL's Solar Resource Data. The same resource the full modeler uses to size PV.
US coverage only. Enter a US ZIP code (e.g. 90210).
Enter a postal code above to see annual and monthly solar irradiance for that location. Values are long-term averages in kWh/m²/day.
Ready to size a system?
The full modeler turns this resource into an 8,760-hour PV + storage + generator dispatch with LCOE, NPC, and payback.