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Post by JohnV on Jun 29, 2022 17:56:29 GMT
JohnV did an electric narrow boat years ago using a forklift truck motor. Batteries have advanced but it's still worth considering gel batteries from a cost point of view. Lithium is wicked but expensive. Nope .... peterboat has done work with a forklift truck motor
The narrowboat I did back about 40 years ago was electric for a different reason (not room for a sod off great generator and a drive engine) and was diesel electric using 15Hp of three phase 415v motors and a continuously variable hydraulic gearbox off a coal mine conveyor belt system directly coupled to the prop. Incredibly inefficient but diesel was cheap and that wasn't the reason for the system (madam wanted an all electric narrowboat, oven, hob, washing machine, and the final cherry on the top, an 8Kw electric shower !!!)
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Post by bodger on Jun 29, 2022 17:58:47 GMT
Luton
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Post by Deleted on Jun 29, 2022 18:01:05 GMT
JohnV did an electric narrow boat years ago using a forklift truck motor. Batteries have advanced but it's still worth considering gel batteries from a cost point of view. Lithium is wicked but expensive. Nope .... peterboat has done work with a forklift truck motor
The narrowboat I did back about 40 years ago was electric for a different reason (not room for a sod off great generator and a drive engine) and was diesel electric using 15Hp of three phase 415v motors and a continuously variable hydraulic gearbox off a coal mine conveyor belt system directly coupled to the prop. Incredibly inefficient but diesel was cheap and that wasn't the reason for the system (madam wanted an all electric narrowboat, oven, hob, washing machine, and the final cherry on the top, an 8Kw electric shower !!!) I'm getting mixed up. I thought peterboat had a Lynch motor on his boat.
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Post by JohnV on Jun 29, 2022 18:04:19 GMT
Nope .... peterboat has done work with a forklift truck motor
The narrowboat I did back about 40 years ago was electric for a different reason (not room for a sod off great generator and a drive engine) and was diesel electric using 15Hp of three phase 415v motors and a continuously variable hydraulic gearbox off a coal mine conveyor belt system directly coupled to the prop. Incredibly inefficient but diesel was cheap and that wasn't the reason for the system (madam wanted an all electric narrowboat, oven, hob, washing machine, and the final cherry on the top, an 8Kw electric shower !!!) I'm getting mixed up. I thought peterboat had a Lynch motor on his boat. I think he has in the widebeam but remember he did a lot of experimenting as well, first with his international orange bath tub test bed
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Post by Deleted on Jun 29, 2022 18:05:48 GMT
Oh yes there was the broads cruiser. I remember now.
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Post by Deleted on Jun 29, 2022 18:06:18 GMT
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Post by peterboat on Jun 29, 2022 21:15:44 GMT
Right Greenman, I got lucky with batteries I bought 30 x 36 volts Lifepo4s 36kwhs for 2.5k, also I have a lot of solar, for emergencies I have a 6kw genny. The motor I originally used a fairly new Forklift truck motor which worked ok but I wanted to gear it down unfortunately it wasnt easy with that motor, so I used the Cedric Lynch motor that I had trialed in the bathtub geared at 3 to 1 which works fine in the widebeam, its pushing 35 tons or so and it stops and accelerates ok. Today I did about 5 hours some of those were against the current on the river with no problems. Cost wise its difficult to say because I picked lots of secondhand stuff and traded for other stuff, but I would think 5k would cover it. If I was doing this again I would do it different, 3.5k will buy you a proper 48volt direct drive DC motor to drop in, I think this includes the inverter and controller, then some batteries to suit, I have a friend that has just bought a 48 volt 200ah Lifepo4 from China with BMS and bluetooth, you would need a few of these plus solar, forget tractions, gel or carbon they wont last and they are heavy. I can possibly get you info if you want it
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Post by bodger on Jun 30, 2022 7:39:03 GMT
Is that the infamous Trent sandbar that kris was too mard to moor on? Somewhere north of Watford I think yes. Luton
. ............. NOW it makes sense ... or not
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Post by greenman on Jun 30, 2022 8:08:16 GMT
Thanks for the info peterboat. I'm going to have to take a look at my options and finances. Wondering what the going rate is for a kidney these days.
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Post by Deleted on Jun 30, 2022 8:24:10 GMT
peterboat have you any examples of the 48v direct drive motor you were thinking of? There is a company called Alien Power System who do a range of Very Nice brushless motors from small remote control aircraft through ebikes. Escooters to electric cars. I reckon one of their motors could be quite a nice thing to put in a boat. Here is an example alienpowersystem.com/product-category/brushless-motors/200mm/200mm diameter 50rpm/volt. Up to 45kw. There is the same with 8rpm/volt but they would need a huge propeller or high voltage. These are not shocking prices £1400. Would need the suitable controller and of course a load of batteries. There are loads of other motors on his site. Amazing powerhouses these little things. Real beasts.
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Post by Deleted on Jun 30, 2022 8:27:49 GMT
Brushless motor porn alienpowersystem.com/shop/brushless-motors/240mm/aps-24050-outrunner-bldc-motor-50kv-40kw-paramotor/This one is 240mm diameter 50mm thick and can do 40kw at 200v. Presumably that means it could do 10kw+ at 48v ? Worth getting a power curve. These disc motors have a heck of a lot of poke. I played with a little 90mm one a few years ago and got a BMX to do about 12mph just sitting the motor on the back wheel. 12v. A big one and 48v would be rather a nice thing to have. Mount it in a perspex box and I guess it would need some forced air cooling. He does have some water cooled motors as well.
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Post by Deleted on Jun 30, 2022 8:50:28 GMT
Those motors are so narrow that one might even be able to fit one between engine and shaft if the gearbox were removed.
That could be interesting as it leaves the diesel in place so you get to play with the electric and find out if it is suitable. If it isn't then the gearbox can go back on and carry on with the cherry go juice.
Hmm. I like this idea.
Thrust bearings need sorting out.
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Post by peterboat on Jun 30, 2022 9:51:48 GMT
Brushless motor porn alienpowersystem.com/shop/brushless-motors/240mm/aps-24050-outrunner-bldc-motor-50kv-40kw-paramotor/This one is 240mm diameter 50mm thick and can do 40kw at 200v. Presumably that means it could do 10kw+ at 48v ? Worth getting a power curve. These disc motors have a heck of a lot of poke. I played with a little 90mm one a few years ago and got a BMX to do about 12mph just sitting the motor on the back wheel. 12v. A big one and 48v would be rather a nice thing to have. Mount it in a perspex box and I guess it would need some forced air cooling. He does have some water cooled motors as well. I want stuff like RPM as well the one indicated runs at 200 volts I think? nice stuff for not a lot of money though
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Post by Deleted on Jun 30, 2022 9:55:38 GMT
The kv rating means RPM/volt.
So a 50kv at 48v is basically just under 2500rpm.
The bloke who owns the company Alien Power System can make motors to custom kv.
I don't know why they use the kv lettering but that is what it means. rpm/volt. Nothing to do with kilo.
The 8kv one looks interesting. For turning a large prop on a paraglider.
Silent paraglider must be pretty wicked.
Up to 200v but it will also run on 48v.
8kv at 48v would be about 400rpm.
I had a Russell Newbery DM2 for years which ran under 1000rpm engine speed and half that for the prop so probably cruising around 250rpm prop speed most of the time. Pushed a 55ft NB along ok.
I expect the diesel had more torque though.
About 70Nm for these motors which is respectable to be fair.
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Post by Deleted on Jun 30, 2022 10:02:54 GMT
RN DM2 around 125 Nm but that is probably at full speed.
BMC 1.5 30hp@2000?rpm torque around 108Nm.
But I bet the electric thing is better at the low speeds.
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