I’d look at a pod-type motor - already water proof. Something like a Torqeedo? If you go for 48v, the 2,500 watt motor needs about 50A - easy to deal with. The motor should not be inside the watertight shell - needs the water flow for cooling. Figure out how long you want to go and do the math to determine battery size - a 70 AH/48v/3,360wH battery will give you over an hour at full throttle with a 2,500w motor. Less expensive to build your own using prismatic cells such as Winston, Sinopoly or CALB. A Daly BMS from AliExpress will handle your small motor OK.
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