With electric outboards, my thinking and experience has been to buy right and buy once. Otherwise, you'll be buying 2 or 3 times.
As others have already said, don't buy what you can get away with, buy as much thrust as you can afford. No one ever regretted having too much power, but plenty have regretted having too little and they ended up buying twice because they tried to get away with what they thought was the minimum.
This is especially true if the electric is your primary method of power. If a wind comes up, you want to make sure you have more than enough power to safely make it back to the pier.
To give you an example of performance, on my small fishing boat is a 16 foot aluminum v-hull and I have a 42 pound Minnkota bow mount. With a 25 HP outboard, fuel, gear, battery, and 2 guys fishing, there is a point at about 15-odd mph wind where the boat can't make effective headway even at full power.
Also, take heed of the advice on batteries, this is at least as important as the outboard. Personally, I think a 100 amp hour deep cycle marine battery is the absolute minimum for reliable power and for frequent full-day trips where the electric provides all the propulsion, I'd say 120 ahr would be a good investment.
Finally, make sure you buy a proper charger that's capable of handling the charging requirements.
Grouse
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