Stormwatch caught charging from the grid

[Artimis]

Last week, in Southern California, there was a high wind/red flag (fire danger) alert issued and many electric companies were preparing to proactively shut down the grid in certain areas as a precautionary measure.

This triggered a Stormwatch alert so my powerwalls started charging to 100% per the feature. Even though I am paired with a PV system, it looks like the Powerwalls used grid power in order to rapidly charge:


I have 2 powerwalls so they can support up to 10kW for I/O and it looks like the gateway used grid power to supplement solar in order to get closer to that throughput.

I was under this impression that this was strictly prohibited for systems paired with a PV system. In order to meet the ITC and SGIP requirements, the system needs to store energy generated 100% by renewable sources (solar).

Does anyone know if there are exceptions to this (e.g. in case of a emergency/disaster prep)? Or is this a mistake on Telsa's part?

 

[jeep1979]

This happened to myself and others as well. I've disabled this feature to preserve the ITC until an answer can be given. Since I run in self-powered mode and the stormwatch occurred after sundown, my solar production was already done, so my batteries charged during the night from the grid.