I will never have time to refute the vast amount of disinformation and misinformation in this thread.
So here are two key points.
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unless you are Mr. Burns and can blot out the Sun, solar panels cannot be turned off. The power they make can be sent to batteries if you have a true off-grid system, backfed to the grid if you have no batteries, or sent to a diversion load. You cannot turn off solar panels. A household air conditioner is a perfectly fine diversion load, for one example, water heater elements are popular.
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preventing home power systems from islanding is a solved problem. The system we installed at my kids school and the system we are currently installing in our church use normal, everyday anti-islanding inverters as required by code. They do not “turn off the solar” when the grid is out, because that would require turning off the sun.
Goodbye, I have systems down affecting multiple hospitals, can’t stick around.
