@Charlie1 Thank you for the buying tip. In November 2023, I went to the Inverters R Us website and ordered the Australia-made SpartanStart soft starter for $146 including free shipping and tax. At that time they had a 20% discount going. In the meantime I installed it in my Dometic Penguin II 11k A/C. At 90 degrees ambient and 500' altitude, my Champion 2500 dual fuel inverter generator on propane and set to the eco mode, started and ran the A/C without a problem. The thunk noise of the compressor starting is completely gone. Very easy installation. My only suggestion would be for SpartanStart to change the included double-sided foam tape to a wider, thicker, more pliable one. Because the tape did not hold, I ended up securing the soft starter by wedging it with the appropriate thickness of Styrofoam between the unit and copper tubes.