Thanks again for the info. Unfortunately the beginning of this thread is no longer available because of the migration, so was not able to read your original post.I got a price reduction on the Powerwall, which was pretty much the cost of the gateway 2. That was easy to justify because there was equipment that clearly was not going to be used. As I noted in my original write up, the installers/Tesla got off lucky with my install. I'm sure they spent less time that they budgeted. I'm good with that because I knew overall I was still getting bargain because the cost was lower than if I had a full concierge sales team that would have quoted a more "exact" installation price adjusted for the complexity of the job. I like the Tesla pricing model.
On the solar side it was a completely independent system from my two other existing solar systems. The only really easy part was I already had a generation panel so they could install without causing any outages (never lost power yesterday). They probably needed to do slightly more work because I had so much existing equipment to route around. So, all in, a wash.
If you have a Tesla Inverter for your existing solar then they could potentially just add panels to your existing inverter although if you look at how they price things, it is mostly on the install, so any cost reduction on not having to add an inverter is not going to be huge. Don't forget that you can get a self referral credit and discount.
my system is Panasonic panels with optimizers into a solar edge inverter. The inverter only has room for another kilowatt, So any new installation would need its own inverter. Or, A new larger tesla inverter for everything. Although I don’t think the panels snd optimizers would integrate with a Tesla system. Anyway, all food for thought