Forgot to include again that the AC Propulsion AC 150 controller can do V2G, either pulling power to charge the battery or pushing power from the battery. So it's possible that the Roadster 1.5 PEM can do this, too.
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...I'm guessing that what @AEdennis was referring to here is not that the motor could rotate in both directions, but that the PEM in the Roadster 1.5 followed the design of the AC Propulsion (not AC Motors) AC 150 controller that operated both as the inverter for driving the motor and the "reductive charger" that used the coils of the motor as the inductors in the charging circuit thereby saving weight rather than adding more heavy inductors. As I said, Tesla changed to a separate charger for Roadster 2.x to avoid the license fee to AC Propulsion.
No, you don't need to draw a picture for me, I understand it well. I have a similar switch that is part of my home solar PV system.It is a Y switch, 'either/or', 2 pole (of course), ahead of the main breaker providing two choices: GRID or GENSET so '2 pole double throw'.
This would provide full isolation between grid and genset since the two are logically isolated from each other. The grid sees this the same as if you simply threw your main disconnect from ON to OFF but instead you switched the house over to GENSET to enjoy off-grid power.
Practically you would install this in its own box ahead of your service panel and the amperage/flashover rating would at least equal that of the main breaker.
@wycolo's term, not mine.You guys are killing me with this “Y” switch. It’s called a double throw switch. Number of poles depends on application, ie double pole or triple pole.