They allow up to 110% of your usage, but I think its since the smaller 5.78 kW system produces an estimated 7400 kWH. The thing with waiting is I don't want install pushed to 2021 and potentially miss fed tax credit and my states adjustable block program. I wonder if a price drop on 2021 will come to account for the tax credit drop. The state incentive could go away altogether, who knows.
lol
Isn't the price for the 8.16 $16,400 (today it is at least). Changes the calculations slightly. I'm looking into solar as well in IL. I'm on ComEd as well - their RRTP plan. The state incentive coupled with the federal credit, makes solar within reach for most people.