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AC Household Power Meter

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timenutgoblin:
assuming that a house had grid-exportable rooftop solar, and the house was connected to the electricity grid, if a current sense resistor was connected between the grid and the house then it should be possible to determine the direction of net power flow by measuring the AC voltages at each end of the current sense resistor wrt neutral. whichever end of the current sense resistor had the higher AC voltage should determine the source of net power flowing through the house. if the AC voltages on each end of the current sense resistor were equal then the net power flowing through the house would be either balanced (grid = solar) or there was no load connected to the house.

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