Originally Posted by Grounded
I replaced the entire power center and will replace the breakers this weekend.
The first step is to try new breakers. I'd focus on the main, 30 amp, breaker and the branch that is tripping. Not sure the box stores carry the 30/15 amp combo FR used, you might need to look at an electrical supply house. I would be looking closely at all the connections, several of my connections were poorly done, insulation not stripped completely. For example, on the battery neutral, FR cut many of the strands to fit them into the holes of the neutral bar behind the power center, that connection bothered me so I added crimp on lugs and screwed those to the bar.
Do you have a transfer switch?