I just upgraded the solar system at my family's off-grid cabin. It's incredible how much battery technology has improved over the last 10 years. Everyone is getting tired of me checking the panel to see how many watts we're bringing in. Next project, install a shunt and get a Raspberry Pi talking to it over USB. And then I'll be able to build a Grafana dashboard. :)
I have a similar project, I'm so overpaneled I bought an electric heater so I could actually see how many watts I brought in during a nice summer day. The victron UIs have an excellent graph history.
What people figure out to do with actually free energy will be exciting. There are a lot of extremely "inefficient" things that might suddenly become commonplace.
Proto-replicator technology where you dump your garbage into a barrel and it gets decomposed and recomposed into something similar to crude oil, blocks of metal, pure gasses, etc? Hydrocarbon fuel from air? Flying cars? You name it.