I'm in the middle of a long, protracted purchase with Sunrun (also 8 kWp) but with 3 Powerwalls.
Pros with Sunrun: I felt their sales process really helped me to learn what was unique about my house and try to get the right solar racking and system. For example, I have a concrete tile roof, and Sunrun sent out someone to inspect the tiles, underlayment, and general roof stuff BEFORE a permanent contract was signed. They helped me to understand my situation with all my skylights, somewhat steep grade, and second story vaulted ceiling (no attic). Sunrun was also the only local installer willing to do stand-off mounts with a triple-course flashing method (top flashing, bottom flashing, and tar) instead of tile hooks. They also assessed that my main service panel was inadequate, and Sunrun absorbed the upgrade into their cost instead of showing it as a line-item extra like everyone else. Sunrun also has a bunch of Powerwalls and Gateway 2s in their East-Bay warehouse.
Cons with Sunrun: The Powerwall design side was a complete *sugar*-show. I think Sunrun just got into the Powerwall game and they knew almost nothing about the Powerwall 2 or Energy Gateway 2. Sunrun tried to configure the Powewalls in the same way they sold their old Brightbox (LG Chem) systems. I'm so glad I found this forum and
@Vines who helped me get the design right. Sunrun literally said they didn't think the proposal would work; but ultimately acknowledged they didn't know the full feature-set of the Gateway 2. Sunrun's good sales-feelings also evaporated after sales handed off my install to Ops/Production. The PM on the production side isn't out here in California. So she may be friendly but has no visibility into permitting, design, utility approval, etc. So progress on my installation basically died between August thru October. I had to take it upon myself to unblock an issue with PG&E since Sunrun was spinning in circles about it.
Anyway, Sunrun has put a local manger on my account to PM this through to completion. It's a night and day difference now that someone actually knows what is happening and can communicate results. I'm back to being happy-ish about things after rattling the cage a bit.
In summary, I don't think Tesla or Sunrun will be much different. Sunrun has some pros and cons, but they aren't going to make you regret buying from Tesla. They're both large scale corporates and will try to make a profit somehow. Tesla makes to make money through aggressive cost cutting; and Sunrun reported negative EPS the last two quarters so I don't think they make money. Tesla wouldn't even do an installation on my house because they deemed it "too difficult"
If I had to do this over again, I'd ignore the low-cost carrot dangled by Sunrun and Tesla; and instead go with a local/reputable PV installer. Then ping
@Vines to get the Powerwalls. That way I'd have saved countless headaches.
PS: Sunrun will process the California SGIP rebate on large-scale installations (3x Powerwall or more). So on the Powerwall side, Tesla may cost more up front, but Sunrun may be cheaper since Tesla adamantly refuses to help customers to participate in the large-scale program.