Abstract: An improved retractable banner assembly featuring an interchangeable banner cartridge assembly having a banner that is both extensible and retractable and a housing assembly, wherein the housing assembly is configured to receive and engage with the interchangeable banner cartridge assembly upon installation such that the banner is extensible through the housing with a bottom edge of the banner positioned in proximity to a walking surface, making it suitable for use in commercial and residential spaces, both indoors and outdoors, to inhibit access and/or to provide guidance through or away from select areas.

Abstract: A solar roof of a building includes a plurality of solar panels removably coupled to a roof of the building such that a first solar panel of the plurality of solar panels is configured to be removed from the roof without removing an adjacent solar panel.