Choice of power and type of electric motor + controller
In this article I will tell you the basic rules for selecting the power of an electric motor (they differ from your usual hp ICE)
The power of an electric motor is usually chosen according to a simple rule: 1.5 kW of power per 1 ton of vessel weight . If it seems to you that this is not enough - I ask you to board my boat, I will show you how 2 kW pull my boat of 2.3 tons in weight. I also doubted initially when I dug up this rule on the English-language forums. Turns out it works pretty well. You will not feel the lack of power. This is true for the movement of the hull of a sailboat. For motor boats, the rules are different, I will not write about this in this article.
The motor itself can be of several types (synchronous / asynchronous, collector / brushless), but I recommend the now common BLDC or synchronous brushless DC motor . I have one like this, they put it on many electric cars, on 90% of electric motorcycles, it is on all electric bikes in the form of a motor-wheel.
BLDC controllers are inexpensive compared to induction motor controllers. In addition, such controllers usually do not require fine tuning to work properly with the corresponding motor.
The controller must be taken in terms of power a little more than the power of the motor . You can always cut the maximum current on the controller as you wish in the settings, and the power reserve will allow you to keep the controller cold and not worry about overheating. Electric motors usually have an air-cooled impeller and it is enough.
We choose a place for the controller of the electric motor. It is best to install it as close to the motor as possible, higher so that water does not get on it (water in the electric motor is even more or less normal, it will survive it, because the windings are varnished, but the controller is not).
From the motor there are three thick phase cables and one bundle of thin wires brought out to one plastic connector - these are the wires of the hall sensors in the motor, they are needed for the motor to work. We connect thick phase and thin signal wires to the controller in accordance with the connection diagram.
Next, install the batteries. There will be a separate article for them, because. there is a big topic.