You might try an inductor. I've used them on welders to keep the inrush of current down.
You could make one from an old current transformer. The ferrite core torrids seems to work best.
I use the same awg wire as the extension cord I'm using to wind the toroid.
My 1.5 hp electric mortar mixer needs one now. It will start for a few seconds, then stop. It's powered from a 4 kw inverter. I'm thinking about 3 milli Henrys should do it. In line capacitors can interfere with starting and also make the motor run hot. I'll let you know how well it works.
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