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Solar City on the Big Island can no longer tie to the grid with 2 way meters. Basically, they now install an off the grid system that can draw power from the grid in emergencies. As a result they want to put in 2 Powerwalls to store for the night time load. When they are full, apparently excess power goes to ground. My worry is if this is safe or will multiple kilowatts going to ground cause galvanic corrosion and other safety problems.

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