Batteries are getting cheaper every day (well, not so much lately), but if your grid is reasonably stable and your power company does net metering they just don

Batteries are getting cheaper every day (well, not so much lately), but if your grid is reasonably stable and your power company does net metering they just don't buy you very much. If you live in an area where the power is regularly going out (or are off grid entirely) then they give you a whole home UPS which is nice, but it doesn't save you money. The only other major use case is when your local power company is run by unrepentant assholes and they screw you over on excess production so it makes sense to try to save that excess production instead of feeding it back to the grid. But this is a penalty reduction instead of an actual savings.