shazzam1452 wrote: I know there have been some proto-types; but that is what I mean do you think they should spend MORE on research and development?

In my highest guesses, I think they spend their money on this kinda stuff based on the market and consumer's needs. Toyota has put those cars out; however, if it's not going well I don't think they will spend much money to do research. Or they might be do, who knows. They might spend money on research to see why people like it and why they don't, what need to be fixed, improved, etc.
In my own personal opinion, I think they should; however, if the price for a solar powered car is too expensive, I'm sorry I have to say I will have to go with a regular car runs with gas. Unless I'm rich then I'll fully support solar powered cars. It's hard to support it with an empty handed, you know.