Negative breaker trips....thoughts???

[hazed]

800 watts of solar, Renogy MPPT 60 amp rover, 6 ga welding wire from negative busbar grounded to frame. The circled NEG breaker from my charge controller to the busbar trips every now and then. Only that one. Any thoughts on why?

 

[sunshine_eggo]

Breakers on the the negative are uncommon as the idea is you don't want to break the connection to ground.

Those look like cheap amazon breakers, and they're notoriously unreliable.

Swap the (-) and (+) breakers. See if the problem moves.

EDIT: loose connections generate heat and can contribute to breaker tripping. Also, you should never run more than 80% of rated current through a fuse or breaker as they will eventually trip.

 

[hazed]

Thank you for the information. I will swap them and swap out with better quality, if necessary.

 

[DIYrich]

Worn breakers trip easily. Once they start tripping, replace it.