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What is the make and model of your genset? Do you have any other AC uses on at the time like the water heater on AC mode perhaps? Get back to me with this information and I can assist you further here.
And you don't have any other AC things on? What is the output AC voltage with no load?
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The AC voltage coming out of the generator to the plugs. If that is low without any load on the set it may need some service. Use a small digital multimeter to check that. About $20 or so at most hardware stores and easy to use. I will also make a phone chat offer for you in case you feel that would be quicker. Some of our customers prefer this.
I got that.......I need to know what the "no load" voltage is coming out of the generator. If that is too low, the A/C will labor and it will shut down the set.
That should be enough, but load testing the genset would be the only sure way to tell. I had one a few years back in my shop that did the same thing. Not sure if you can find someone in your area with a load bank for testing. Another thing to check is what the AC volts drop to when you have the A/C running. It should be above 105 VAC for sure. Try that and let me know.