Last Friday I had my third attempt of riding the board. After 1 minute of full throttle (in water without foiling) the motor stopped and the ESC began to catch fire. To my setup:
I have a SSS motor with the Seaking 130A and two 6S battery’s in series. The ESC is directly water cooled with lake water. The electric box on top of the board was perfectly dry.
One motor-ESC cable got loose at the bullet connector at ESC side because of the heat as well at the XT90 connector of the series cable adapter. Everything is working (batterys, motor, etc) except of the ESC.
The two reasons why the big fire may occurred:
I used 12 AWG cable (1,5m)
In the propulsion system was a lot of water which get in touch with the motor.
To my question:
to 1) Could it be that the ESC burned because of the too small cables? But if so, wouldn’t react the cables as a fuse and safe the whole system? BTW, I didn’t have a fuse.
to 2) Is it possible that there was a short cut because the motor saw to much water? Or can I run a brushless inrunner like an outrunner under water?