Thursday, January 13, 2011

Re: [Electric Boats] Re: Repowering a 65 motor sailer

 

Something like this:

http://cgi.ebay.com/Baldor-60-hp-EM2547T-Motor-MOT2076-/390074607407?pt=LH_DefaultDomain_0&hash=item5ad242272f

Years ago I saw a picture of a commercial boat which had a motor like this belted to the existing propshaft. I think it was just for emergency operation in case the primary engine failed or maybe to troll at low speeds with better fuel efficiency. I don't think it ran off of a battery bank. I also don't know if there was any VFD, reversing, or speed control device.

These motors are often 220V and higher. Also often 3-phase AC, but I think you can find just about anything.

The only boat I have seen personally with an industrial electric drive is the Hornblower Hybrid in SF Bay. I met the engineer who repowered the boat with the drive system.

If I remember correctly they used a large 3-phase 480VAC motor which was normally used to operate large fans for underground mining ventilation. It ran off of large generators or for a very short time off a battery pack and an inverter VFD. Interesting, but pretty complex, cumbersome, and heavy.

The company, Hornblower, built the boat to placate the city of San francisco to have a "green ferry" as a condition for being awarded the Alcatraz ferry service contract. I think it is interesting technology, but I am kind of skeptical about its green credentials.

It has two vertical axis wind generators and 2 or 3kw of solar panels. Under ideal circumstances I guess about 4 to 5 horsepower green power contributing to 1000hp in diesel generators. Less than a half of a percent, but that's just a guess.

That said I guess you have to start somewhere. Good luck with your plans.

Cheers,

Hans K.




--- On Thu, 1/13/11, Tom <boat_works@yahoo.com> wrote:

From: Tom <boat_works@yahoo.com>
Subject: [Electric Boats] Re: Repowering a 65 motor sailer
To: electricboats@yahoogroups.com
Date: Thursday, January 13, 2011, 12:03 PM

 

I may have missed it somewhere in this thread, but I don't recall: Is the boat intended to be run under battery power alone (no genset running), and for how long?

-Tom

--- In electricboats@yahoogroups.com, GNHBus@... wrote:
>
> I was looking at Baldors yesterday, this would take @ 40-50kw , do you have
> more infos on this Hans?
>
>
> In a message dated 1/12/2011 8:35:29 P.M. Eastern Standard Time,
> hanskloepfer@... writes:
>
>
>
>
>
> If redundancy is what you are looking for have you considered an
> industrial ac motor like a Baldor. I have seen large yachts which have a large
> industrial Baldor or similar motors belted to the existing prop shaft. This is
> just a simple method of providing some redundency. It would perhaps require
> a larger generator, but this could be used for other power hungry AC
> appliances.
>
> Just a thought.
> Hans K
>


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