Won't even bother with details on how much solar power is needed to run a home as your calculations are off. I've been a follower of a great magazine in Oregon. Many have long believed in "getting off the grid" utilizing solar, wind, and hydro systems.
The bottom line is this. Had solar and all other sources of alternative energy taken off since the gas lines of the 70's, we would be less reliant on oil. But now that oil is on the minds of most everyone, solar and all sorts of energy related products are coming up to speed. I have known engineers that have built homebrew electric cars since the 60's. Earliest technology of electric cars go back from around 1900's. Didn't know that, did you? Check out the electric auto association at www.eaaev.org