where i live, that's currently the domain of registered electricians. plug-in solar etc is apparently going to be legislated for soon, but in the meantime, there's quite a steep monetary barrier & people living in apartments without access to a roof are out of luck.
there's more to solarpunk than literally just solar power, though. setting up a tool library with your neighbours is solarpunk; running a book swap or clothes swap or mask bloc is solarpunk; repairing and DIYing items & teaching others how to do the same is solarpunk.
being individualist & isolated in an off-grid cabin isn't solarpunk, even if that cabin uses renewable energy sources. solarpunk is about divesting from all oppressive systems & building better ways of doing things, in your community.