Yesterday was very stormy, very little sun made it thru in the morning so after charging my car after lunch the battery was down to 15% (usually it'd be in the 90s). There was so much cloud coverage after lunch that no solar power was produced for the rest of the day, so the battery did not gain any additional charge.
From the afternoon on we lost power 3 times. Each time everything kept running with the exception of the AC unit. Just 1 Powerwall is not enough to run it, nor the 50 amp car charging outlet, so circuits for both were relocated to a new breaker-box which cannot be powered by the battery; though, as by the big green spike in the screenshot above, the battery can assist with those provided the grid is up. If I had a second Powerwall the AC and car charging would be supported without the grid.
This morning battery was at 12%. Forecast is storms for at least thru next week Thursday.
Due to likelihood of sporadic solar power and additional power outages during this time, I decided to bump the backup reserve to 50%.
There's some sun this morning and the battery is using all available solar to charge, while the house is exclusively using the grid.
Even with the current cloud cover enough sun is getting thru to generate 0.7 kW, and the battery's up to 17%.
A) circuit breakers for the Solar and Powerwall:
B) Main panel, can be powered without grid:
C) New sub (side?) panel, requires grid: