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mapserve3.nrel.gov/PVWatts_Viewer/index.html: PVWatts "Performance calculator for grid-connected PV systems" interactive map for the US - very nice!
rredc.nrel.gov/solar/calculators/PVWATTS/version1: PVWatts for US and worldwide
https://openpv.nrel.gov: Open PV Project Database