There's the plug-in solar panel system. It's very easy to install. It's suitable for renters to add supplemental solar power with little cost and effort. It's portable enough that renters can bring them to their next rentals. It's very popular in Germany, with several million units installed. They call it balcony solar panel. People hang the panels on their balconies in apartment buildings. Germany allows up to 800-w…
That's swell if you have a balcony facing the sun and enough space for 4m2 of solar without blocking your neighbors' sun. In my unit for example, it's completely infeasible.