Plug-in solar systems are designed to be used without requiring specialized technicians, construction permits or permission from electricity utility companies. A typical system consists of small photovoltaic panels that can be placed on a balcony, in a backyard or on a deck or roof area. They are connected to the home’s electrical system by simply plugging them into a regular power outlet.



As the article says, these are for personal use when restrictions prevent people from installing permanent solar systems. They can’t power a whole household, let alone the building.
From the article: