Living IN the sunshine state and paying FPL 11.2 cents a kW-hr for electricity, my yearly electric bill is $2100. I’ve had solar companies give me estimates for my home with a net-metered system they claim will meet 100% of my power needs (my calculations say, No, 85% at best). The cost is $20,00 to $29,000 without incentives and NO power storage. Power storage with Li-Ion battery packs (the only reasonable solution) would almost double the cost to about $45,000. Florida is a great pace to install solar but we don’t have basements to store the batteries. They’d have to go in a shed outside the house.
Considering the $2100 I pay for power now, even a $20,000 install is a push to replace only $1785 worth of FPL electricity. The payback with no interest exceeds 11 years. When you figure in the cost of money, the degradation of the panels and the increased cost of insurance (a hidden little secret!) there is no payback. Forget storage, that pushes it totally out of line. If I used an electric car to commute (I am retired), as @TwinTurbo pointed out, I’d be pulling off the grid or storage to recharge it. And it is HOT here in the summer at night so I’d be competing with home AC for power.
The cost of a grid-tie system is within reach and I will very likely install panels when my roof gets replaced to minimize the costs. Maybe that will free up some kW-hrs for electric car owners.