I dont have powerwall, I had solar city install a leased solar system in 2015. The one piece of advice I would say is, depending on your roofing material, you might need to keep an eye on the crew on the roof. They say they replace roof tiles and they do, but in my case they left several broken ones.
I only knew as I could see a broken one outside one of my second story windows. I called solar city at the time, and they sent the crew chief back and he made it right... but he had to replace something like 20-30 more roof tiles than they did on installation day.