I'm not sure I would do a relay for the ground / neutral thing. One of the great advantages of a fully isolated converter approach is that you can get around these sort of issues. The guys who do this on boats are *very* big on that part of it.
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Do indeed consider the inputs above. A balanced approach is a good idea in any design.
(so that's a new bug for me .... weird ....) sorry for the dupe..
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