Tutorials Tutorials Basic PV Tutorial pages NREL’s PV tutorial page. NREL is one of the nation’s premiere renewable energy research facilities. This page contains case studies and some basic explanations. Solstice’s Renewable Kiosk page. This page has a very good section on PV. Solstice’s PV basics page. This page is designed to educate people about PV. It has a lot of good explanations and photos, and is available on CD-ROM.