If a person had deep pockets (Like Doc deep) we could put a solar roof on our house with it's own powerwall......but who really has $50,000 to eliminate an electric bill and have a fridge in case of EMP attack? I wanted to start installing these for Tesla....but I don't know if it will ever catch on, very expensive. The way they present it you are paying the same as a shingled roof, but they are also figuring in your electric bill for the next 30 years. You figure a new 50 year shingle costs you $3 per foot, solar roof costs $30 per foot, but then you have no electric bill and a tax credit.