How big is a solar panel?Post author:freedomtask2Post published:January 15, 2020Post category:FAQThe average size of most panels for rooftop solar installation is about 65″(5.4 ft) by 39″(3.25ft) You Might Also Like Do solar panels save money? January 15, 2020 Is solar technology changing? Should I wait? January 15, 2020 Why is solar power the best energy source? January 15, 2020