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Old 18-10-2019, 19:03   #1
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finally-an-electric-crate-motor-you-can-drop-in

Not sure where to put this, so mods, pls, at your leisure

Possible use for sailboats?

The article says "the drivetrain measures 23.6 inches wide, 17.3 inches deep, and only 11.02 inches tall. We’re talking about a box that’s two feet by a foot and a half by a foot here. That’s pretty damn tiny.

It weighs only around 154 pounds and makes around 110 horsepower—a pretty decent number considering how compact this thing is, and that includes everything: motor, single-speed transmission, cooling system, and power inverter"


https://jalopnik.com/finally-an-elec...our-1839168140
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Old 18-10-2019, 19:26   #2
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Re: finally-an-electric-crate-motor-you-can-drop-in

You realize of course that this is for automobiles, specifically for front wheel drive auto’s so it has outputs for twin shafts?
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Old 18-10-2019, 20:22   #3
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Re: finally-an-electric-crate-motor-you-can-drop-in

um, yes...and how big would the house battery bank need to be to motor for 2-3 days at say 6k ?

just asking...

cheers,
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Old 18-10-2019, 21:18   #4
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Re: finally-an-electric-crate-motor-you-can-drop-in

Well I ain't no EE but even I thought, whew!! I have my doubts.
ok, what batteries do those CARS have?
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Old 18-10-2019, 22:44   #5
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Re: finally-an-electric-crate-motor-you-can-drop-in

...who said electric propulsion is not powerful?
https://en.m.wikipedia.org/wiki/EuroSprinter
...
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Old 18-10-2019, 22:55   #6
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Re: finally-an-electric-crate-motor-you-can-drop-in

It's not the motors that are the problem (electric motors are way better than diesel for the stuff we use them for in sailboats) it's the power storage that's the issue
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Old 18-10-2019, 23:38   #7
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Re: finally-an-electric-crate-motor-you-can-drop-in

No one with the slightest clue ever said electric motors can't produce a lot of power.

Of course, that's not much different in size from your average econobox engine and most of those are over 100hp.

As others have pointed out, the challenge with electric motors is storing enough energy to power them for any length of time. It's much more challenging with boats because running at cruising speed (70mph) an econobox with a 110hp motor, might only be using 40hp. A cruising boat on the other hand with a 110hp motor will likely be running at 70-80 hp when at cruising speed because it has to push a lot of drastically heavier water out of the way..
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Old 19-10-2019, 02:37   #8
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Re: finally-an-electric-crate-motor-you-can-drop-in

Quote:
Originally Posted by chrisr View Post
um, yes...and how big would the house battery bank need to be to motor for 2-3 days at say 6k ?

just asking...

cheers,
Interested in any informed answers. I think it is an impossibility to reasonably afford that much battery power. In my boat, a very slippery and low drag hull, 4 L-I batteries gives 20 nm of range at 4.5 knots. From what I can glean, speeding up to 6 knots roughly doubles the draw (or halves the range).
If I use 60 hours at 6 knots and assume your drag is the same I estimate you would need 36 sets of 4 batteries.

Am I in the ballpark? By the way, I would give my eye teeth for a battery bank with that range so I hope it is possible.

Dan
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Old 19-10-2019, 06:34   #9
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Re: finally-an-electric-crate-motor-you-can-drop-in

As I understand it, used/wrecked Leafs are going very cheaply and the price of other 1st and 2nd gen EVs is dropping too. Finding high capacity well built batteries is getting easier every day if you don’t insist on brand new.
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Old 19-10-2019, 06:51   #10
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Re: finally-an-electric-crate-motor-you-can-drop-in

The output is on the side of the engine. Seems it would make it interesting to fit in the engine space on a boat. I suppose you could rotate it 90 degrees and have all the big stuff over the output.
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Old 19-10-2019, 08:18   #11
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finally-an-electric-crate-motor-you-can-drop-in

Quote:
Originally Posted by danstanford View Post
Interested in any informed answers. I think it is an impossibility to reasonably afford that much battery power. In my boat, a very slippery and low drag hull, 4 L-I batteries gives 20 nm of range at 4.5 knots. From what I can glean, speeding up to 6 knots roughly doubles the draw (or halves the range).

If I use 60 hours at 6 knots and assume your drag is the same I estimate you would need 36 sets of 4 batteries.



Am I in the ballpark? By the way, I would give my eye teeth for a battery bank with that range so I hope it is possible.



Dan


Maybe for a lithium bank, but if lead the faster you draw the power out, the less total power there is available.
You’ll get far more power out of a battery if you draw it out over 20 hours than you will if you do it over say 5 hours.
Then high power draws also shorten the life of a battery (lead)

Then auto’s to gain efficiency and use smaller wiring etc run bank voltages in the hundreds, the Prius is in the 300’s and I believe the new Porsche runs an 800V bank.

If you try to go that route, be very careful, with the amps we are talking about, those are lethal voltages
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