Hi Ben, I have the gateway 2, and Northern Powergrid are saying that the G100 spec is not enough… even though there isn’t another spec as far as I know.
They say that with the extra inverter (in the powerwall) this is now too much potential output to the grid - even though the powerwalls don’t output.
I didn’t make the application myself, The phoenix works did this for me, so not sure on the specifics, however I believe the application was G99.
When I had the original solar+powerwall installed, this was done by Joju Solar. This was a G99, and included the 6kW inverter and the 5kW powerwall.
Surely an extra 5kW can’t make that much difference.