The high frequency noise it outputs is just like any other switching power supply, so simply trying to detect that will cause a lot of false positives. (I will also design the output filter to be very effective at attenuating noise, which is required in order for the PLC receiver to work.) Also, it never exports to the grid - in fact, the inverter will not completely offset the load. It also doesn't send impedance test pulses, since it doesn't need that with the lack of export.
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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