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A relay is a control device that allows a small voltage or current to control a larger voltage or current. Use this tag for questions about standalone relays in electrical or HVAC wiring -- questions about relays in appliances do not need this tag.

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There is more to it that you may not realize. By using manual switching, you inherently prevent even the remotest possibility of back-feeding the utility grid with your solar power. It is not physical …
answered Apr 18 by JRaef