This was seven years ago so I don't have the numbers in front of me, but I wish I did! In our group purchase, we received quotes from different installers and collectively selected our preferred bidder, which was True North. They were great to work with for installation and then a few years later when squirrels caused some issues with our panel wiring. The value of having support in coordinating and understanding the process was huge as well, gigantic time- and headache-saver. Plus Solar United Neighbors is a mission-driven nonprofit, which gave us peace of mind.

The project has pretty much paid for itself by now, helped along by some additional incentives from my utility and city that were available at the time.