Hi - First time poster, short time reader/viewer of TMC Recently had Tesla Solar Panels installed on the house here in New Jersey. We started the process back in mid February, panels were installed in early June, now waiting for the power company to install their new meter. Overall we've been impressed with the Tesla communication/installers/follow-up. Once I turn on the system, I'm sure we'll be more excited. 5.185kw with 17 panels We're also on the list for the Powerwall 2, in late 2018 or early 2019. 1 PW I'm quoted 9.5k installed (before tax credit), 2 PW's for 14.5k (again before tax credit).. The question to the group, do I go with 1 or 2 PW's? We've been in our home for nearly 3 years and no major disruptions in terms of electricity. Is 2 PW's truly needed? I'll also mention that that we're expecting a Model X delivery in early September 2018 so I'm thinking of going with 2 PW's. Thoughts? We can charge the X during the overnight, using the PW stored energy through our own energy, releasing it's stored power, no? Also, what's the life expectancy of the PW is 10+ years? Any help/recommendations is much appreciated! Thanks.