Helioscope Software Free _best_ -

HelioScope: Professional Solar Design for Free? HelioScope is a powerful, cloud-based platform developed by Folsom Labs (now part of Aurora Solar

SunCalc.org

For pure helioscopic (sun observing) needs—such as finding solar azimuth and altitude for a specific date—websites like or NOAA Solar Calculator are completely free. These do not handle light fixtures or IES files, but they solve the "sun path" half of Helioscope’s function. helioscope software free

5. PVSyst (Not Free, but a Student Option)

1. PVWatts (by NREL):
2. Google Project Sunroof:

   integrates CAD-caliber layout tools with bankable performance simulations into a single cloud-based interface. Because it is entirely web-based, there is no software to install; users only need a browser and an internet connection to start designing. Key Features Available in the Free Trial HelioScope: Professional Solar Design for Free