Sounds good, but the electrical control systems to do that without screwing up the grid are expensive. When you factor that in, you are way higher than $1/watt.
I don't see too many people putting solar panels (the last energy fad) on their houses any more. However, go ahead, I'll watch with interest, and join in when and if it's proven.
It's already proven depending on how the sunlight is where you live. Currently payoff is less than 5 years in such places, much less with this cheaper technology. Solar installations are normally guaranteed for 20 years, so that means at least 15 years of profit.