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Tesla Electric Boat Motor

Old 01-30-2021, 05:10 AM
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Default Tesla Electric Boat Motor

Any of you guys see this yet? Is it legit?

There has been a ton of progress in EV and lithium batteries as of late. Iíll be curious how, if at all, this tech will transition to boating. I know it will only add to the cost, but hopefully costs come down with time.

Old 01-30-2021, 05:16 AM
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They never showed the size of the boat in the vid, could be a canoe.
Old 01-30-2021, 05:21 AM
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Originally Posted by king_me View Post
They never showed the size of the boat in the vid, could be a canoe.
With 350 HP ?
Old 01-30-2021, 05:24 AM
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Originally Posted by king_me View Post
They never showed the size of the boat in the vid, could be a canoe.
If you check the video description, they mentioned that they used a 28 ft tritoon as the test mule. They were running thermal analysis on the battery and motor over about an hour or so.
Old 01-30-2021, 05:25 AM
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Originally Posted by jmac50958 View Post
With 350 HP ?
Well maybe a ganoe then I would imagine the battery source has to be pretty significant in size and HEAVY. Wish they would have shown more in the vid other than just a motor.
Old 01-30-2021, 05:33 AM
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Description from the video:

aleb Reinhart

Full disclosure, this was a test of an early prototype. The purpose was to test various sized heat exchangers for cooling the Tesla motor, but we thought it would be fun to share the experience as a sneak-peek of what weíre working on. The trim was not ideal. Iím nautically challenged, however we captured the thermal data we needed just the same.I only showed the motor because the rest of the boat isnít as pretty. Again, this is a prototype on an inexpensive 28í Tri-toon our local marina had sitting around. Far from an ideal platform for the final product, but was an exceptional value for a test mule to rapidly iterate upon the design.Many ask about range and battery size/weight. As with any EV, range is proportional to speed and drag. This particular test was intended to get the motor hot for testing thermal management. We used approximately 61kWh of energy during an hour of mixed high-speed/low-speed testing. The battery for this test was the Model 3 Long Range pack with 74 kWh of capacity weighing about 1050lbs. Our product that will be offered in 2021 will debut on a smaller 24í vessel with much lower drag coefficient, sealed recessed battery compartment, and fully integrated control electronics and infotainment. It will be much easier to advertise specifications for range and performance on the actual product platform once unveiled.
Old 01-30-2021, 05:45 AM
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Stated 1050lbs of batteries for a single.
Twins = 2100lbs ?
Trips = 3150lbs ?

Gas is 6lbs a gallon, correct?

We're gonna need a bigger boat!
Old 01-30-2021, 05:49 AM
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Originally Posted by Resinhead View Post
Stated 1050lbs of batteries for a single.
Twins = 2100lbs ?
Trips = 3150lbs ?

Gas is 6lbs a gallon, correct?

We're gonna need a bigger boat!
These electric motors should be more reliable than an ICE outboard, so would you even need/want multiple outboards?

Still though, your point is made. Iím sure the tech will continue to evolve and batteries will become lighter over time. Regardless, this may work well for most inland boaters. It may be some time till itís ready for those going far offshore.
Old 01-30-2021, 06:23 AM
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I fail to see how this is even useful for inland boaters.
They pretty much killed the battery pack with an hour of usage testing thermal load while varying the speed and load on the battery pack.
My inland boat is a 20.5í bass boat with a 250 hp 2 smoke Merc EFI engine. I can easily run the engine for over an hour, blasting around the lake from fishing spot to fishing spot, and burn nowhere near 176 gallons of fuel which would be the equivalent of the battery pack. I typically burn about 25 gallons fishing or 150 pounds of fuel.
Want to take the kids out tubing and go for a swim? Well youíve got an hour of use so plan your fun accordingly? No thanks.

Is it cool tech? Of course but until they can figure out how to get the weight down so you can easily change the battery pack or get A LOT more energy out of the batteries itís not a viable option over traditional ICE.
Old 01-30-2021, 06:31 AM
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Originally Posted by Resinhead View Post
Stated 1050lbs of batteries for a single.
Twins = 2100lbs ?
Trips = 3150lbs ?

Gas is 6lbs a gallon, correct?

We're gonna need a bigger boat!
There is a little more info on their web site, but basically they used up most of the battery in an hour, and if you convert the KWH of batteries to what that would be in gasoline (factoring gas engines use about 25% of the energy in a gallon of gas), they use about 4 gallons of gas. So 1000lbs of batteries vs. 24lbs of gas.

Battiery development is making them cheaper, GM has said the LG batteries are 40% cheaper than pervious versions, but batteries aren't getting ligher, so I don't see any real application on a planing boat for a long time.
Old 01-30-2021, 06:45 AM
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I wonder what prop and gears they used,
because the electric motor is not like regular gas motors , so that should change how things are done
variable pitch props might be in the future also
Old 01-30-2021, 06:48 AM
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That is pretty cool. Probably not going to work for offshore trips for a long time, but for messing around on a lake this could be awesome.
Old 01-30-2021, 06:50 AM
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Originally Posted by 99yam40 View Post
I wonder what prop and gears they used,
because the electric motor is not like regular gas motors , so that should change how things are done
variable pitch props might be in the future also
With a flat torque ďcurveĒ an electric motor wouldnít need a variable pitch prop, I would think.
Old 01-30-2021, 06:53 AM
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If you havenít watched the video yet, let me just say that the first 10 seconds is all you need to watch, because the next 3 minutes is pretty much the exact same. Just trying to save you time!!
Old 01-30-2021, 07:15 AM
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Originally Posted by Kwacker2 View Post
I fail to see how this is even useful for inland boaters.
They pretty much killed the battery pack with an hour of usage testing thermal load while varying the speed and load on the battery pack.
My inland boat is a 20.5í bass boat with a 250 hp 2 smoke Merc EFI engine. I can easily run the engine for over an hour, blasting around the lake from fishing spot to fishing spot, and burn nowhere near 176 gallons of fuel which would be the equivalent of the battery pack. I typically burn about 25 gallons fishing or 150 pounds of fuel.
Want to take the kids out tubing and go for a swim? Well youíve got an hour of use so plan your fun accordingly? No thanks.

Is it cool tech? Of course but until they can figure out how to get the weight down so you can easily change the battery pack or get A LOT more energy out of the batteries itís not a viable option over traditional ICE.
It comes in steps man. Boating is quite a bit different than cars obviously, so the EV tech will need some adjustments before it to be viable. This is a nice first step, however. You might as well get used to this. Itís coming whether you like it or not. GM pledged to go all EV by 2035. There is a heavy assault on fossil fuels, and youíre going to see a decent increase in fuel prices over the next 4 years. Youíll probably see a major increase in the next 8 of things stay the same as they are today...if you catch my drift. Just be glad somebody is researching this now because when gas goes up to $5+ per gallon, youíll be cursing that kayak when trying to get to all these different locations since thatís all weíll be able to afford.


Old 01-30-2021, 07:16 AM
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Originally Posted by TheRealMacGyver View Post
If you havenít watched the video yet, let me just say that the first 10 seconds is all you need to watch, because the next 3 minutes is pretty much the exact same. Just trying to save you time!!
Ha, true that.
Old 01-30-2021, 07:17 AM
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I think the torque curve of these EVs will be a nice change. I imagine youíll need a redesign of the lower unit and prop, but just think how quickly youíll be up on plane and how fast youíll yank those skiers on there feet. Better hang on!
Old 01-30-2021, 07:43 AM
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I can’t wait for the first one to come through Haulover take a wave over the bow, flood the thing and catch on fire.




Old 01-30-2021, 07:48 AM
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Another thing to consider is what happens if lithium batteries get wet! Hope they have those suckers sealed tight!! And you know there will have to be a bunch of them, and since they are heavy they will be low in the bilge.
Old 01-30-2021, 07:52 AM
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That video has been posted here several times as well as tons of other electric boat threads

Not realistic for most that want to cruise any significant distance

Batteries = heavy

Good luck finding a place to re-charge

Not happening any time soon

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