The house I moved into has a well. I find that the inrush current to the pump is some 26 Amps (normal running is between 6 and 7 amps). The pump is a 240-volt, 2-wire pump. No start capacitor can be seen at the top of the well or in the house. I don't know what kind of pump is down there, though Google Earth suggests the well was worked on around 2019, so the pump may be newer.
I am considering putting a soft-start on the pump, so my generator, which might barely push 20 amps at 240 volts into space heaters based on my tests, will have a chance of starting the well pump. (The generator is a Pulsar HD6580B at 5500W max on gas, 4950W on propane; the heater test was run on gas fuel.)
If this pump had an accessible start cap I'd be OK with adding a soft start that replaces starting caps (like this https://www.microair.net/products/easystart-364-3-ton-single-phase-soft-starter-for-air-conditioners ). But I don't know if the pump has a start cap down at the pump, or what a soft-start might do on a motor that has a start cap.
I am considering something like a Schneider Altistart ATS01N1. https://www.se.com/ww/en/product-range/779-altistart-01/ PDF for one possible unit: https://download.schneider-electric.com/files?p_enDocType=Instruction+sheet&p_File_Name=ATS01_IS_ATS01N1--FT_1624685_07.pdf&p_Doc_Ref=1624685 Other ideas would be appreciated.
Will adding a non-start-cap-replacing soft-start to a motor that has a built-in inaccessible start cap cause trouble?