There are a ton of people in this country that are downsizing, full time RV living, boat living etc. there are solar applications that will work quite well for these people and already are working. Is it unlimited? Of course not, but the way we live in this country is changing and I refuse to rely on an energy grid that is old and crumbling. I have six acres in a secluded area of SC that I’m putting a fifth wheel on, my energy consumption will be very low. Well water and a septic system will get me totally off the grid. Should all be done in 1-2 years and if the grid doesn’t crash, my kids and grandkids will have a cool place to camp ??There are lots of problems. Right now, solar and wind is about 5% of our total electricity. It works great for the Amish - who have very low needs. It can work for agri-business in certain situations. A lot of our business is remote cabins that are too far from grid access and doomsday preppers.
But powering a modern home or business exclusively? It can be done but the amount of panels and the battery storage (and cost) is massive - and they still need back up.
I think the best way to think about it is that it is a neat little supplement and is great for some applications with lower electricity demands.
Right now the return on solar investment is about 15 years. It depends on which state you are in and what credits you are eligible for.