We had a power glitch yesterday, FPL had a transformer fail. I never saw it while I was working on my iMac. Mitzi's iMac shut down and she said she saw her lights flicker, which prompted me to check the Tesla app on my iPhone.

The Powerwall is configured to switch to grid power once it has discharged to about 20% of capacity, leaving that as a backup reserve in the event of an outage. That's why the state of charge is at 22%, we'd been making enough power to start charging the batteries again, but we were still some way from peak production.

There were actually two outages yesterday, we never noticed the second one. We received an email from the HOA clubhouse that it was closed because the power went out around 1:10 PM. Though it was restored quickly, the HVAC units didn't come back up, so they closed the clubhouse. I checked the app and it shows two backup events yesterday, at 8:49 AM and 1:10 PM each about 5 minutes long.

I don't know if they were exactly 5 minutes long, or if the software running the switch-over waits a few minutes to see if power is stable before re-connecting to the grid. By all accounts, they were brief interruptions, but probably not good for anyone.

It got to over 100°F here yesterday, so we're using a lot of power for air conditioning; and Mitzi and I each used the car yesterday so we got about a third of our total power from the grid.

In the illustration above, the house is only consuming 400 watts at that moment, while the array is producing 2,000 watts so you see 1600 watts going to the Powerwalls. It's animated in the app, so it's clearer.

We've been in Saul Hall for four years now, three of those years receiving power wirelessly from a remote off-site fusion reactor you may know as "the sun."