There is something wrong with the port AC causing a higher load. If you are still on the boat check the filter baskets/strainers on the water intakes and the inlets on the outside of the hull. The charter company just does not want to fix it. This is not a generator issue if it’s the port AC breaker popping. The Genset breaker would be tripIng if that were the case or the Genset was overloaded.