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Small correction from a previous post. The Magnum MS-2012 is a pure sine wave unit so works with a GFI.
MSW units are quite different. Normally the black hot lead from shore power swings in both directions to make a sine wave while the white neutral lead stays at ground. In a MSW the black lead swings positive but then its clamped to zero and the white lead neutral is pulled negative. This results in what approximates a 120V sine wave but totally screws up the GFI. If you put a scope on the whit lead referenced to the green safety ground you'll see this.
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