I wonder to what extent we can make it unskilled, at least for a building with modern wiring. Plug-and-play solar panels and batteries sound scary, but not necessarily impossible to do safely.
But they already exist and are pretty popular in Germany to put on your balcony.
But if you put the panels basically anywhere else it becomes a lot more viable. Some houses come with a plug to connect your generator, you can do something similar to plug in your inverter. Then you can later decide to put up a solar fence or put solar panels on the balcony or whatever strikes your fancy