It's not so much being unplugged as it is sensing whether the mains power is down. If it is, they stop backfeeding immediately, just like hardwired solar inverters do.
replyIf this weren't done, there would be risk of electricution to anyone working on wiring in the house or on the utility distribution network.
They have to sync up and feed power in phase with the grid when its up as well, in the case of net metering setups.
replyEven without net metering.
replyIt's also important for the male plug prongs to not be live when unplugged.
replyI commented a little too quickly and left the nuance out. Your answer is much better!
replyThanks. I would have asked Claude or something but I know so little about this topic that I wouldn't have been skeptical enough of its answer.
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