If I were of the notion to add solar to power loads in my house without getting permission from the utility, or to power critical loads in a power outage (which very much intrigues me), I'd put those loads on a sub-panel with a generator transfer switch.
I believe this would absolutely protect the grid from my off-grid generation. I'd make an off-grid solar array, solar > charge controller > batteries > inverter > sub-panel. This is on my list of things to do before this year is gone, since the 30% credit starts slowly tapering away as of 1/1/2020.
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