In order for a trolling motor to run efficiently, the proper battery power is needed. Host John Greviskis explains the formula that a trolling motor uses for power.The formula a trolling motor uses for power is one amp per one pound of thrust. A 24-volt system will only consume about .75 amps of power per hour, per one pound of thrust. If you have a 36-volt system, you would only use .5 amps of power, per one pound of thrust.