Converter and GFI issues...and how does a Converter work?

thank you for all the information and tips. I now have a better understanding of how a GFI works and why it would trip. I was expecting to find out where the issue was by turning on breakers until it tripped (thinking hot water heater, ac, fridge, living room, etc), but was surprised that everything was good as I kept truning on breakers until the converter...as soon as that breaker was turned on it tripped it. So it seems something is out of whack in there. Thanks again!