my uncle gave me an old (broken, who knows how) 1800-watt true-sine power inverter, the kind used to run a small house off of car batteries
could be fun
@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.
@diodelass True sine wave inverting is done with high-frequency PWM (think: many many kHz). If the folks writing the control are good (i.e., very fast current loops), you'll see under 1% THD for resistive loads and less than 5% for non-linear loads.
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