Holy crap. That's more than I thought.
Be sure to secure that rooftop from the neighborhood hooligans and ruffians.
We have two chimneys and a huge oak tree they had to work around, but they still managed to eke 2.4 kW out of a north-facing city inside rowhouse flat roof. 20 year lease and then you either extend for another 10 years, buy it at whatever nominal market value the system has at that point, or they come and take it away and fix your roof (no charge).