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I've always wondered, what if you were to wire up a panel and one light to the grid, but the then rest of the house is on a separate independent circuit? Technically the house is on-grid...

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You could get caught if ever there's a fire, or you need an electrician and you forget to undo that before the electrician gets there, or if there's some sort of code inspection.

I don't think it's that simple. These circuits are already a thing in the form of solar powered security lights, and shed lighting kits.

I suspect the dividing line is voltage? >50v systems in cars are treated differently, so maybe the same for houses, you probably don't need that much for lighting anyway.

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