Solar Insolation
Estimated Daily Solar Insulation Contours, in calories/sq.cm/day.  Source: State Dept. of Planning and Economic Development, Energy Division "Sunshine Maps."  These maps are based on extrapolation of a limited number of data points and should be used as a general first-cut illustration of irradiance.  They were originally intended to simply distinguish between "sunny" areas and "cloudy" areas.  The sunshine maps should not be used for sizing PV arrays; map users are advised to seek additional data on sun-hours per day. The boundaries depicted in these maps are approximate only.  For more information, see metadata at https://files.hawaii.gov/dbedt/op/gis/data/solrad.pdf or contact Hawaii Statewide GIS Program, Office of Planning and Sustainable Development, State of Hawaii; PO Box 2359, Honolulu, Hi. 96804; (808) 587-2846; email: gis@hawaii.gov; Website: https://planning.hawaii.gov/gis.
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