Brick is 18 volts, sine wave. ZW-L is not a sine wave and I believe the peak to peak voltage is actually higher than 18 volts. I think it was identified as more like 22 volts in one of the video's? The ZW-L is also monitoring more than current. It is checking on actual power consumption (current times voltage). At this point in time I can't ink of a reason for the apparent false positive on an open frame motor at 18 volts.
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