I like this idea. It's no where near a new idea, but I think the $3K cost may be attractive for some ppl looking to take on the initial risk of this. Solar energy can be the future, but the efficiency and startup cost is the problem. With this, it may be a start in the right direction.
I don't know the exact details on how much you can potentially save with this, but if this does work and catches on, count me in!