At issue is that a residential roof is no bigger than the residence. That does not make residential installations a dumb idea. They just cost more than alternat

At issue is that a residential roof is no bigger than the residence. That does not make residential installations a dumb idea. They just cost more than alternatives. On very large commercial buildings, a project may claim economies of scale, and support dedicated personnel to keep them operating well. That said, roofs are far from the best place to site solar.