An important, if somewhat tardy, update to this thread. Please see the thread linked below for further discussion.
In April of 2022, Tesla released new features for existing PowerWalls which include grid charging and time-shifting solar production.
These are discussed in detail in this thread: New Powerwall Advanced Options [Toggles for charging from and discharging to grid from powerwalls]
A quick summary. In current versions of the Tesla App, the Settings, PowerWall page may include settings for these features. I say "may include" because availability of the features depends on one's utility rules and PW installation. In addition, at least early on, some owners had to request Tesla Energy Support to enable the features or get explanations of why they were not available to certain owners.
The two biggest new features are:
Grid Charging, which can be set to No or to Yes. This was the original topic of this thread.Energy Exports, which can be set to Solar or to Everything. This was a big surprise, and allows the PW to discharge to the grid during peak pricing periods, down to the reserve setting. Depending on ones utility rules and rate plan and system sizing, this may increase the NEM economic reward for exporting solar production.
Tesla's documentation on these is here: Powerwall Modes | Tesla Support
Again, please see the the discussion thread linked above.
SW
Please direct any further discussion on this topic to the referenced thread.
