Yep you should use a 50 (max) with 8 gauge wire.
Fair Winds and Following Seas
Bill H. PTC USN Ret
Chesapeake, Va
I put the 50amp breaker that minn kota recommended. cheapest place I found it was Amazon,
So I ordered some bobby Garlands taboot!
Bussmann Hi-Amp Circuit Breaker - 50 Amps : Amazon.com : Automotive