The GRID has 3 wires ( 120 Volts) one is HOT ( Normally black = death), the second is Neutral ( normally White = life) and the third is Green or ground.
The GRID applies the AC to the Black and the Neutral is connected to the Ground at the transformer common = ground.
The ground and the Green are used to detect current flowing from the Hot = black to the ground to disconnect the GRID power from the Hot.
So the Neutral does not have any voltage, just the carrying current.
The MSW Inverters use the Neutral to send the Negative level of the MSW wave form.
so the Neutral can not be left grounded any where, so it has to be FLOATING for the MSW to operate properly.
Better MSW do have the Neutral grounded.
Nando
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