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Did this just start or has it been doing this all along? What is the make and model of your genset? Get back to me with this information and I can assist you further here.
I would also measure the actual AC voltage output from the genset to be sure it isn't too low. Low voltage causes the amperage to spike and trip out breakers. Try disconnecting any loads on that circuit as well and see if this happens. If it continues, there may be some feedback into the ground lead that is causing this. Get a small digital multimeter and you can check this pretty quickly. About $20 or so at most hardware stores and easy to use and I can direct you in some testing. Hope this proves helpful here. All follow ups are included in our fee and fully expected.
Just checking back in to see if you were able to resolve this or do you still need some additional input from me?