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Your comment makes no sense. The tesla wall connector is a home charging port you install in your garage.

I knew this is about wall charger at home but I assumed ‘time of use billing’ was some kind of billing system for the charger that’s implemented.

some people have variable electrical tariffs, so electrical use in the middle of the night is usually much much cheaper than the middle of the day.

That's done on the property's electricity smart meter.