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I have a plug in power meter that had a warning sticker warning you not to use it on a generator or an inverter. I did it anyways with extreme caution. The power meter can read the correct true RMS voltage from modified square wave. The meter is powered through a series resistor-capacitor power supply and the resistor gets extremely hot when used on modified square wave.
What causes this?
Secondly, I noticed shaded-pole motors run slower on modified square wave from inverter compared to powering from sine wave from the outlet. Why?