Electric inboard motor, my journey to find proper motor

Yes, it's why I use No-Ox-Id on every electrical connections.
After removing natural oxide with scotch brite, of course.

 

Auminum cables on a boat are a terrible idea. They are prone to fatigue cracks. Electrolytic corrosion is another drawback. Finally, they have to be of a larger gauge for the same current rating as a copper conductor. Aluminum has 61% of the conductivity of copper.

 

Yes, I know this since I started to play with lithium battery 16 years ago.
BUT, I learn recently that some aluminum grade have huge difference in conductivity. 61% is only for 1100 serie and 6101.
Here some % of conductivity for popular and easily available grade:
-3003-0 = 50%
-3003-H14 = 41%
-5052-H32 = 32%
-6061-T6 = 43%

Those are really important differences

 

That is right, their conductivity is even worse.