Why trips to overlaod
Could be an inverter generator is too intelligent for the job.
Air con motor is an inductive load and so there will be a considerable current surge at switch-on.
The surge at the initial switch-on will be relatively small compared to the surge created as the motor stops and starts as the unit cycles during operation when the compressor is working harder.
Standard generators will generally withstand a short duration overload of up to 50% without damage which will cater for a motor starting current surge. I am guessing the intelligent circuitry of the inverter generator will see the initial surge as a fault condition.
The cure will be to go back to an old-fashioned type of generator or uprate to the modern type with a much greater capacity. There will be much guesswork involved as the air con rating plate will state only the continuous run current consumption and not the surge current which could be many times greater.
Air conditioner compressors require a greater amount of electricity (measured in both volts and amps, but the amps are what is causing the overload). You will need a larger generator to run your AC. You might be able to run a smaller AC unit, but always check the Amps required and compare that to the Amps the circuit breaker on the generator is rated for.
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