Choice of Electric Motor

About powering boats with electricity

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Jamie
Posts: 7
Joined: Sat Aug 20, 2016 2:15 am

Choice of Electric Motor

Postby Jamie » Sat Aug 20, 2016 2:28 am

Good morning.

I am thinking of building an Amp Eater and am looking into suitable motors. I plan to use it on calm, non-tidal rivers and wonder whether motors from electric scooters will be suitable. An example that is fairly available here is below.

HMParts E-Scooter electric Motor 24V 500 W Model: MY1020
Electric motor
24 volt DC (direct current) 500 Watt
Rated Speed: 2800 RPM
Rated current: 28 A
Image

Kind regards,

Jamie.

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CaptDave
Posts: 150
Joined: Wed Aug 20, 2014 8:09 pm
Location: Columbus, OH

Re: Choice of Electric Motor

Postby CaptDave » Tue Aug 23, 2016 10:29 am

Jamie,

Greetings fellow Amp Eater builder. I too am currently building an Amp eater.
In answer to your question, while 500 watts may give you hull speed on a calm day, I would be afraid that you would be running close to the max rating of your motor most of the time which could result in overheating the motor. Occasionally it might be useful to have some reserve power as well. Personally I would recommend something larger 750 watts or more.

Also, for the rated speed of the motor you will need to have about a 3-1 or more reduction for the prop.

Good luck on your build. Be sure to check out my amp eater progress.
Capt. Dave
Builder of the Amp Eater Aquatron

Jamie
Posts: 7
Joined: Sat Aug 20, 2016 2:15 am

Re: Choice of Electric Motor

Postby Jamie » Wed Aug 24, 2016 12:51 am

CaptJack,

Thank you for the information. I agree that 500w is probably a little small for comfort and shall look for something a little larger.

It will be a while before I am ready to start building, but shall follow you build in the meantime. Good luck with the project.

Kind regards,

James.

Jamie
Posts: 7
Joined: Sat Aug 20, 2016 2:15 am

Re: Choice of Electric Motor

Postby Jamie » Thu Aug 25, 2016 1:22 am

I have contacted the designers of the boat who felt that 500 watts would be adequate: they used a 1,000 watt engine which was more than enough. However, I have looked further afield for a motor and located some manufacturers in China who can supply single 24 volt, 1,200 watt motors, shipped and supplied for reasonable prices, so shall probably pursue that route once I am ready.

Regards,

Jamie.

User avatar
CaptDave
Posts: 150
Joined: Wed Aug 20, 2014 8:09 pm
Location: Columbus, OH

Re: Choice of Electric Motor

Postby CaptDave » Fri Aug 26, 2016 8:07 am

Jamie,

Sounds good. I look forward to seeing your progress.
Capt. Dave
Builder of the Amp Eater Aquatron

Jamie
Posts: 7
Joined: Sat Aug 20, 2016 2:15 am

Re: Choice of Electric Motor

Postby Jamie » Sat Aug 27, 2016 1:20 am

Captain Jack: I shall post details on here, once I get going, but realistically, this will not be until next year. I have another project to finish first (not boat related) and then I need to move my current workshop so that I have space to build the boat.

James.

acheter
Posts: 1
Joined: Sat Jul 14, 2018 2:52 am

Re: Choice of Electric Motor

Postby acheter » Sat Jul 14, 2018 2:58 am

Thanks


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