1.46 now allows the car to charge when there's a power outage. It has a setting that has a threshold for the Powerwall, below which it won't send solar power to the car unless it's excess power. But what's missing is a threshold for the car. I might want to use a setting that's different from what I specified in the car. For example, if my everyday charge level is 80%, I might want to specify 95% during an outage.
This is a good start, but it won't help much if my car thinks that it's charged as much as I want. If I have an outage, plenty of sun, a partly charged Powerwall, and a moderate draw in my house, my system will see that I have more solar power than my single Powerwall and the house combined can take in. It will see that the car is already charged. So my car won't get charged more, the house will run off battery, and the solar will turn off since there's no place to send the excess power.
On the other hand, if they had a setting for the car, then during an outage with plenty of sun, the system could send solar to power my home, power the car at a high enough rate that what's left is slightly more than the maximum that the Powerwall can take in, and then charge the Powerwall at the same time at close to maximum speed.
I could probably change the setting in the car manually, assuming that I know about the outage, which is only a step up from not having the feature at all. Without the feature, I could have started the car charging manually at a low amperage. In theory, I could even start it remotely, since the car would start at low amps, test the voltage, step up the amps, and find that at a certain point there's a voltage drop causing it to step the amps back down. There's no way to set the car's charging amperage from the app, so I never had the flexibility that I would have wanted.
So far I've had only one outage since I had the Powerwall, and was away from home, so there wasn't anything that I could have done on my own with the car.