My buddy went all in, 70k on tesla wall, as much capacity as his roof could handle. 2 years into it, the power company changed how much he gets charged back, and basically, they charge for a delivery fee both ways, etc , etc, etc . Long story short, he will probably break even around 2038 when the panels are at the end of their life. Ymmv I have panels, I did it myself, get the largest panels from a wholesaler and i was able to significantly break even sooner. My northern Mexico place is completely off grid, it's way cheaper to buy stuff down there.