I tested starting my air compressor with my 5kw varrac. I was only able to reduce starting amps from 45 amps across the line starting down to 35 amps by switching the varrac on at 220v and very quicky turning it up to normal 245 volts.
Effectively soft starting a capacitor start, capacitor run induction motor is proving difficult.
Some reduction is possible but a dramatic reduction looks to be elusive.
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