The "turning the grid up to 11" attack isn't really possible. I know it seems like it is, but the inverters will only advance frequency so much before they back off, the inverters will only increase voltage so much. Etc. Sounds scary, isn't practical.
Turning everything off when the panels are at peak output? That lets frequency sag enough that plants start tripping offline to protect themselves and the grid and it'll cascade across the continent in just a few minutes. Then you have a black start which might take months.
There's an excellent video on how catastrophic a black start is. https://youtu.be/uOSnQM1Zu4w?si=x0dA7X7-19CJm6Kf
