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 Will solar power ever be viable? January 15, 2020 Roof-Mount System or Ground-Mount System January 15, 2020 what is a critter guard? January 13, 2020