Small Trolling Motor for Ebike Battery? Does not need to be powerful only light-weight and silent

Boats, Jet Skis, Kayaks etc., including hovercrafts
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rubatone   1 µW

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Joined: Jul 23 2019 4:27am

Small Trolling Motor for Ebike Battery? Does not need to be powerful only light-weight and silent

Post by rubatone » Jul 23 2019 10:34am

Been looking around on the internet trying to find a light-weight, silent, cheap, 48V trolling motor to power an inflatable boat/kayak.
I want something so light-weight and small so that a can tow it behind my bike on a small bike trailer like the one you would normally use for transporting a child or a dog.

I already own two powerful ebike batteries that I use with my 750W ebike for work commuting: (not my picture)

Image

I bought the extra battery from a guy whose bike sadly got stolen, and a got a great price and thought that it might come in handy in the future.

The specs on these batteries are 48V and 15,6Ah, and there are LG cells inside.
That means that I have 748Wh + 748Wh = 1.5 kWh of energy in total.
Weight of both batteries are 4 + 4 Kg = 8 Kg (17.6 Pounds).

Image

Problem is that all 48 V trolling motors are very heavy and very powerful and much more expensive than your standard small trolling Minn Kota. Some of the 48V electric boat motors look like normal outboard motors and they are heavy and also quite noisy, and I want small and silent.

Does anyone have a product to recommend me or another simple solution that would fit my battery setup?

Thanks!

SlowCo   100 kW

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Location: The Netherlands

Re: Small Trolling Motor for Ebike Battery? Does not need to be powerful only light-weight and silent

Post by SlowCo » Jul 23 2019 10:57am

Put a DC-DC converter inbetween that does 48V to 12V and can handle enough amps to power a simple 12V trolling motor. Or get a 48V PWM controller and set it to 1/4 output.

rubatone   1 µW

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Joined: Jul 23 2019 4:27am

Re: Small Trolling Motor for Ebike Battery? Does not need to be powerful only light-weight and silent

Post by rubatone » Jul 23 2019 12:47pm

Thanks! Which will be the most quiet solution? PWM ord DC/DC converter? Dont like high pitch sound of whining speed controlled motors.

I also dont know what type of speed regulation a small Minn Kota uses.

SlowCo   100 kW

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Posts: 1339
Joined: Jan 05 2015 5:43pm
Location: The Netherlands

Re: Small Trolling Motor for Ebike Battery? Does not need to be powerful only light-weight and silent

Post by SlowCo » Jul 23 2019 2:52pm

The small Minn Kota 30lbs trolling motor takes a maximum of 30A:
https://minnkotamotors.johnsonoutdoors. ... 1563910824

So you'll need a 48V to 12V 30A converter like these:
https://www.aliexpress.com/item/3251652 ... b201603_60 (middle one)
or:
https://www.aliexpress.com/item/3230583 ... b201603_60 (last one)
Or, if you want a little higher voltahe (=more rpm), this one:
https://www.aliexpress.com/item/3282225 ... b201603_60(48V to 13.8V)

If you want a motor with more thrust (=more amps) you'll need a more serious one:
https://www.aliexpress.com/item/3297574 ... b201603_60

rubatone   1 µW

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Joined: Jul 23 2019 4:27am

Re: Small Trolling Motor for Ebike Battery? Does not need to be powerful only light-weight and silent

Post by rubatone » Aug 07 2019 2:23am

Thank you kindly "SloCo" :)

SlowCo   100 kW

100 kW
Posts: 1339
Joined: Jan 05 2015 5:43pm
Location: The Netherlands

Re: Small Trolling Motor for Ebike Battery? Does not need to be powerful only light-weight and silent

Post by SlowCo » Aug 07 2019 4:58am

No problem, hope it helps.

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