Bow thruster not producing much thrust

[O C Diver]

Took me a bit to come around to the current draw issue, but see that now. Vetus' page for this model includes an asterisk that notes "this model is design to be a compatible replacement for older Vetus BOW75 4.7kW units." Mine might draw more than 500 amps. No way that should be on 110 feet of 2/0 cable.

4.7 KW (4,700 watts) ÷ 12 volts = 392 amps. From recollection, a DC motor running at below rated voltage shouldn't require more amps, it should slow down.

Even more keen to know how much of a voltage drop you're getting.

I would consider taking your start battery up the the bow thruster and wiring it with some 2' cables as an experiment. See if it gives you the push that you want and how much of a voltage drop. Then all you have to do is decide how many boat units you want to invest.

Ted