American Solar Energy Society www.ases.org
International Solar Energy Society www.ises.org
National Renewable Energy Laboratory www.nrel.gov
Solar Energy Industries Association www.seia.org
Solar Rating and Certification Corporation www.solar-rating.org
PVWatts https://pvwatts.nrel.gov/ Performance calculator for grid-connected solar power systems.
SAM (System Advisor Model) https://sam.nrel.gov/ Performance and financial model designed to help estimate costs for grid-connected power projects.
SRDM https://www.nrel.gov/docs/legosti/old/5607.pdf Solar Radiation Data Manual for Flat-Plate and Concentrating Collectors for each of the 50 states, the Pacific Islands (Guam), and Puerto Rico.
Sun Path Chart http://solardat.uoregon.edu/SunChartProgram.html Online tool creates sun path charts in Cartesian coordinates.
Tracking the Sun https://emp.lbl.gov/tracking-the-sun Tracking the Sun s a collaborative effort between government, industry, and the public that is compiling a comprehensive database of PV installation data for the United States.
Latitude and Longitude https://www.fcc.gov/media/radio/dms-decimal This utility permits the user to convert latitude and longitude between decimal degrees and degrees/minutes/seconds.
Solar Maps https://www.nrel.gov/gis/solar.html How much sun does your home state get per year?
Magnetic Declination https://www.ngdc.noaa.gov/geomag-web/ Declination is calculated using the current World Magnetic Model or the International Geomagnetic Reference Field model.
Solar ABCs http://www.solarabcs.org/ Solar America Board for Codes and Standards
DSIRE http://www.dsireusa.org/ Database of State Incentives for Renewables & Efficiency
List of Solar Equipment https://www.energy.ca.gov/programs-and-topics/programs/solar-equipment-lists List of Solar Equipment by California Energy Commission
Roof Azimuth http://tools.solmetric.com/Tools/roofazimuthtool Online tool for locating a rooftop and estimating its azimuth using aerial images
NCPV https://www.nrel.gov/pv/national-center-for-photovoltaics.html National Center for Photovoltaics
FEMP https://www.energy.gov/eere/femp/federal-energy-management-program Federal Energy Management Program
IEA Solar Heating and Cooling Program. International Energy Agency. http://www.iea-shc.org
IEA Photovoltaic Power Systems Program. International Energy Agency. http://www.iea-pvps.org
ESTIF Solar Heat Europe http://solarheateurope.eu
WMO World Meteorological Organization https://www.wmo.int
European Commission Renewable Energy https://ec.europa.eu/energy/en/topics/renewable-energy
PVGIS solar radiation and PV performance European Commission Joint Research Centre http://re.jrc.ec.europa.eu/pvg_tools/en/tools.html