"modified sine" is an A+ marketing phrase tbh
has quite a professional ring to it, unlike the more obvious "I can't believe it's not square wave" or "holy harmonics, batman"
@diodelass Per a bunch of TI Design Notes, "Pure" sine wave is just PWM switched FETs at a frequency such that the harmonics are way way above 60hz. Some include output filters to reduce those harmonics even more.
If it's better than average grid power, it's "pure" sine wave.
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