Did the math on my house a year ago. Despite a excellent Southern oriented unobstructed roof line, my savings weren't near your projected amount. Not worth it. Not only that, the batteries have to be replaced very 5/7 years. They won't charge/discharge forever. Same problem with all those electric car proponents. Them batteries ARE expensive.
I heard firefighters hate those solar panels because of their obstruction to fighting a house fire. Like to hear an opinion from one.