I will never even consider figuring out any kind of payback or return on investment, I really don't care if this costs more than buying power from the grid, it's way more important to me than any of that, l have a buddy who is kind of a survivalist type, he has a favorite saying I really like, "When the music stops, I aint gonna be the guy without a chair." There is a little of that involved but mostly, it's the fact that we are using something that blows over us all and has always been there and will always be there until this rock is incinerated by the sun, and we are using it to support a modern lifestyle. And, we are all doing our own microscopic part to stick it in the eye of big oil and king coal, yada, yada, yada, don't go gettin all teary eyed on me now guys.