As an earlier post said, thank you to TonyMS for selling his 18' unit to me.
For those who don't know, the Wall Connector communicates with the Powerwalls to ensure that the latter aren't depleted in the event of a power failure. Since I live in "green" California, we decommissioned a bunch of nuclear and coal fire plants — and we have been suffering though power outages when there isn’t enough wind or solar to keep the grid up — like since late last week. So I have been running off of my solar and Powerwalls while the rest of the neighborhood went dark.
And that means I am charging my Tesla and Prius in the afternoon when I have plenty of solar power and unplugging them before the sun goes down.
Oh yeah -- and our state government banned the use of natural gas in new buildings so that everyone has to rely on the comes-and-goes electric grid.