Sounds like the breaker needs replaced or reset. A faulty ground wire would be suspect as well if the breaker checks out ok.
Depending on how it was installed, there will be a breaker for the generator portion of your unit. It will not be the breaker at the main terminal (battery) because you indicated it would run, but no power. It might have had a slight overload and it popped.
Davekc
owner
20 years