Started having issues with my breaker tripping under typical conditions.
75ah deep cycle 12v battery > 60a circuit breaker (manual reset) > ~10ft 8awg wire > Newport Vessels 55lb thrust trolling motor
This is the setup I used without any issues for all of last year. The breaker never tripped regardless of conditions, runtime, etc.
Over the winter I replaced the deep cycle with a 100ah LiFePO4 12V battery, upgraded the wiring to 4awg, and added a PWM unit. This setup also worked flawlessly until a few weeks ago when I ended up in a lake with WAY too much grass and wind to boot. I pushed the motor trying to navigate through and started smoking the PWM. Disconnected and went straight battery>motor and immediately started tripping the breaker. Called it a day, pulled up the motor and started paddling my heart out.
Took the PWM out of the equation and had two fishing trips without issue and then at the end of a long day while cruising back to the launch had the breaker start tripping at full speed (no grass or obstructions this time) and had to drive back on setting 4 of 5.
Bought a brand new breaker thinking I’d pushed the last to the breaking point and the first trip out the breaker trips after a few minutes at full speed and wouldn’t reset. I had to pull out a wrench and rewire the battery to bypass the circuit breaker and limped home as slow as I could manage. Once home I took another look at the breaker and it would reset for me.
Besides the first day I started having issues in the grass, every instance of the breakers tripping has been in clean water and under full speed. The prop shaft is clean and spins smoothly, prop is in good condition, connections are tight with no corrosion, no signs that the battery or motor are compromised in any manner.
Could the new breaker have just been a dud and a bad coincidence or am I missing something? Again I haven’t had any issues running the motor at full speed for extended periods of time in the nearly 150 hours on the water with this setup.