Regardless of the motor brand or hull type, a motor will pull enough amps to try to meet the load. Once the coils are saturated the rest of the battery energy is turned into heat. This means that you can load the motor enough to burn it down in very short order. There is no answer to how many amps a motor is pulling, it depends on the total load mentioned above including prop size, hull type and trim, driveline friction, battery quality, connector size and condition, wire length, motor condition, water conditions and motor cooling.
To find the best pack capacity it is best to find out what others are using when they drive the boat like the OP will. Is he sport running, oval racing, or speed passes? How long does he want to run? What is his budget? Is speed more important than component life? There is no simple chart or answer.
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