On BUSA somebody recently posted the chart for the amperages of every minn kota motor. I'd have to look for it again but it seems to me the highest amperage was around 55 amps for the bigger trollers. I'd guess 30 amps of protection is a pretty safe bet for your 36 pound. When I used to rig Ranger boats I seem to remember the push button reset breakers were always around 50 amps.