[pamarine]

Assuming a .5 amp draw per pound of thrust, and a circuit length of 40 ft (from battery + to motor to battery -), you would need a minimum of 4 AWG wire. I can sell you the wire for 1.50/foot plus terminals & shipping, If you would like, I can crimp the terminals on before I ship you the wire. Let me know if you think you want to tackle the project yourself.