Hmm. This implies that if you don't have enough solar to power your house (and maybe never will with pure solar) then you would be advised to start turning off anything you can to get below the solar threshold. For example if your house is drawing 1kw and your solar will not produce that much until a few hours, it might behoove you to turn off as much load as you can to get the solar back on. Then after the PWs have charged sufficiently or the solar has gotten above the threshold to start turning on critical breakers.
Yes, that’s true, and the powerwall user’s guide even suggests turning off as much as possible if you get into a situation where your powerwalls drain completely before morning. However, hopefully that’s not a situation that happens frequently. Ideally your powerwalls would be sized to your power demand and you’ll be able to make it through the night without completely draining the powerwalls.
I can't tell from the SLD why the PWs cannot be charged from the solar even when the house needs are higher. Must be something in the GW logic
The situation I was referring to is when you are in an extended outage and you have no grid power. In that case the house always has priority for solar power and the powerwalls only get excess solar power. The powerwalls and solar are on the same circuit as the critical loads, so there is no way for the system to direct the power from the inverters to the powerwalls without also powering your critical loads.
When you are on grid, then it can use the grid to power the house and use all of the solar power, if necessary, to the powerwalls.
It’s not super clear in your SLD, but if you look closely you can see that panels 3 and 4 are connected with no switch between them in the gateway. The gateway cannot isolate the generation panel from the backup loads panel. In fact, in some installations there aren’t even two separate panels, but everything is on one panel.