My order was confirmed 5 Oct 2017 for a power wall to replace expired deep-cycle batteries in an existing PV system. Supplied an as-built wiring drawing for the existing system and photos of every related component. Since then, there has been no engineering plan, a report that Tesla would likely need to apply for a permit with PG&E to substitute their battery, and finally today a report that the engineering team has decided that the Powerwall can't provide backup power until they develop software to do that.
Not cancelling the order, mind you, "just putting it into a holding pattern". And since the "engineering team" hides behind a wall of "advisors", you can't get a credible explanation of why.
I suspect Mr. Musk and Mr. Straubel have no idea that the people they hire are so inept at turning my money into their money.......