There are 48v alternators available, that are purpose built for the job.
Electrodyne makes a 60, 75 and 100a version. I got pricing on the 75 and 100
amp models:
GE75-48 $868.01
GE100-48 $929.33 each
Chris
On 7/17/09 11:21 AM, "Colin Girvan" <colingirvan@yahoo.com> wrote:
>
>
>
>
> I'm also very keen on this possibility and put forward the same suggestion
> several weeks back. It seems the major problem with this set up is regulating
> the output to charge batteries.
>
> As far as bypassing the batteries to run directly off the output, I may be
> wrong but I thought you could do this through the batteries. In other words
> the motor takes 100 amps out of the batteries while the generator puts in a
> 100 amps. I would be interested in peoples comments on whether this is correct
> and if so would there be losses involved or are the batteries acting as a wire
> connecting the generator to the motor.
>
> Colin Girvan
>
> BC Canada
>
> --- On Fri, 7/17/09, Alycia & Kevin Miller-Lynch <ak@twcny.rr.com
> <mailto:ak%40twcny.rr.com> > wrote:
>
> From: Alycia & Kevin Miller-Lynch <ak@twcny.rr.com <mailto:ak%40twcny.rr.com>
> >
> Subject: RE: [Electric Boats] The missing link in "affordable" diesel electric
> To: electricboats@yahoogroups.com <mailto:electricboats%40yahoogroups.com>
> Received: Friday, July 17, 2009, 3:42 AM
>
>
>
> I'll be the first to admit I'm a hack--- no expert, but here's a thought.
>
> Instead of buying and off-the-shelf diesel generator, why not make one? Buy
>
> e-tek type motor with regen capability (thunderstruck? ) with belt or direct
>
> drive (get the correct speed) to something alike a carrol stream liquid
>
> cooled diesel (or even aircooled if you don't mind the noise and run some
>
> venting). This is in addition of course to your primary electric motor for
>
> propulsion. You could probably do it for about 2500. Still not cheap
>
> cheap, but less expensive then a commercial option.
>
> You use the regen to charge your bank as you draw on it. Possibly even hook
>
> up a bypass circuit and run the motor directly off the generator (just like
>
> the big cruise ships).
>
> The motor with regen would be much more efficient then an alternator (don't
>
> need to excite the coils) and probably doesn't cost a lot more then a high
>
> capacity alternator.
>
> Let the critique begin.
>
> Kevin
>
> From: electricboats@ yahoogroups. com [mailto:electricboats@ yahoogroups..
> com]
>
> On Behalf Of Mike
>
> Sent: Thursday, July 16, 2009 10:48 PM
>
> To: electricboats@ yahoogroups. com
>
> Subject: Re: [Electric Boats] The missing link in "affordable" diesel
>
> electric
>
> Chris:
>
> I certainly can understand the frustration of sailing backwards. For me
>
> going electric has made me plan my trips with tide and currents more because
>
> of the limits of electric storage capacity but, I did the same when I had a
>
> diesel engine too. I also anticipate there may come a time when I might want
>
> to anchor and wait for the breeze or current change if the battery bank is
>
> running down. Happily so far that has not been a choice I've had to make..
>
> Bucking currents is never any fun.
>
> The beauty of electric propulsion is the ability to incorporate new
>
> technologies into ones system whether it's a more lightweight generator or
>
> new battery technology according to one's needs. So far my needs are being
>
> met by the solar panel, wind generator and Honda 2000i. But, I look forward
>
> to reading about your choice in generators too.
>
> Mike
>
> http://biankablog. blogspot. com
>
> --- On Fri, 7/17/09, Chris Witzgall <chris@witzgall. org
>
> <mailto:chris% 40witzgall. org> > wrote:
>
> From: Chris Witzgall <chris@witzgall. org <mailto:chris% 40witzgall. org> >
>
> Subject: Re: [Electric Boats] The missing link in "affordable" diesel
>
> electric
>
> To: electricboats@ yahoogroups. com <mailto:electricboa ts%40yahoogroups .com>
>
> Date: Friday, July 17, 2009, 1:41 AM
>
> Mike;
>
> In most situations, you are correct. However, there are times when prolonged
>
> motoring in adverse conditions is just a part of cruising. There are also
>
> times when the wind is light, and currents mean that you are either going
>
> backwards, or motoring. It is these kinds of scenarios that I would like to
>
> have the option of motoring.
>
> Hopefully, this is not often. The gensets I have found are really more than
>
> I think I would want. Something that can safely generate 60a, or even less,
>
> may be ideal. I am not sure. But having the ability to extend the motoring
>
> time say by 50% with the help of a small single cyl diesel genset may be the
>
> ticket. If Lombardini/Kohler can make an air-cooled motor that is 70 lbs for
>
> 6.7hp, could they not create a 5hp water cooled one for not much more? Then
>
> add an Electrodyne 75a Alternator, and you have something. Or something like
>
> that.
>
> I would consider the air cooled generator, except I think they would be too
>
> damm loud.
>
> Chris
>
> On 7/16/09 9:31 PM, "Mike" <biankablog@ verizon. net> wrote:
>
>> >
>
>> >
>
>> >
>
>> >
>
>> > Chris:
>
>> >
>
>> > While I was thinking putting in a 48 volt diesel generator is always an
>
>> > option. But, I think I've gotten too use to the smell of clean down below
>
> to
>
>> > go back to diesel. I'm not so sure that a diesel generator will be all
>
> that
>
>> > reliable in a storm anyway. There are plenty of stories of diesels that
>
> have
>
>> > died in storm conditions as the crud in the tanks got stired up and
>
> clogged
>
>> > the filters. If you are in a storm there will be wind and a storm sail
>
> may be
>
>> > a better choice than relying on an engine to slug it out with the ocean.
>
>> > Remember too in storm conditions your wind generator should be pegging the
>
>> > ammeter too charging your battery banks. Then there is a sea anchor and
>
>> > drouges which may not give you any forward movement but, will allow you to
>
>> > rest. Hopefully. <g> I'm not sure how having a diesel generator will help
>
> that
>
>> > much in storm conditions.
>
>> >
>
>> > Mike
>
>> > http://biankablog. blogspot. com
>
>> >
>
>> > --- On Wed, 7/15/09, Chris Witzgall <chris@witzgall. org
>
>> > <mailto:chris% 40witzgall. org> > wrote:
>
>> >
>
>> > From: Chris Witzgall <chris@witzgall. org <mailto:chris% 40witzgall. org>
>
>> >
>
>> > Subject: [Electric Boats] The missing link in "affordable" diesel electric
>
>> > To: "electricboats@ yahoogroups. com <mailto:electricboa ts%40yahoogroups
>
> .com> "
>
>> > <electricboats@ yahoogroups. com <mailto:electricboa ts%40yahoogroups
>
> .com> >
>
>> > Date: Wednesday, July 15, 2009, 3:37 PM
>
>> >
>
>> > We have a 32¹ Westerly Fulmar. It weighs perhaps 12,000 lbs, with a 26¹
>
>> > waterline, and is currently powered by a Volvo 18hp engine.
>
>> >
>
>> > It seems to be that both motor and battery technology has finally come to
>
> a
>
>> > place that can support owner installed electric boats that need to be able
>
>> > to have a longer range. The missing piece is a small, light diesel dc
>
>> > generator that can put out between 40-100a @ 48v. Something like this, but
>
>> > marinized:
>
>> >
>
>> > http://www.polarpow erinc.com/ products/ generators/ 1-3,5kw_Lambardi
>
> ni.htm
>
>> >
>
>> > Is anyone else thinking about this the same way as I am? Our future plans
>
>> > may include a few years of full -time cruising, so we won¹t be able to
>
>> > recharge at the dock, and extended motoring time for safely is a
>
> necessity.
>
>> >
>
>> > Put a 400ah 24v bank, or a 200ah 48v bank of LIFEPO4 batteries, weighing
>
> at
>
>> > ~100 lbs. Add a 12v converter, say 10 lbs. DC motor and assembly, 50-100
>
>> > lbs. DC Generator, 150lbs (made up number) Total system weight = <360 lbs
>
>> >
>
>> > Remove: 305lbs engine and transmission. 160lbs of lead acid batteries.
>
> Extra
>
>> > diesel tankage already on boat (keep 20 gallon tank only) 50lbs. Total
>
>> > removal: 515lbs.
>
>> >
>
>> > The only component that is missing is that generator. Gas is not an option
>
>> > for safety reasons. While the little Hondas are great generators, I would
>
>> > not want to rely on keeping one running during a storm.
>
>> >
>
>> > Thoughts?
>
>> >
>
>> > Chris
>
>> >
>
>> > [Non-text portions of this message have been removed]
>
>> >
>
>> > [Non-text portions of this message have been removed]
>
>> >
>
>> >
>
>> >
>
>> >
>
>>> >>
>
> [Non-text portions of this message have been removed]
>
> [Non-text portions of this message have been removed]
>
> [Non-text portions of this message have been removed]
>
>
>
>
>
>
>
>
>
>
>
> __________________________________________________________
> The new Internet Explorer® 8 - Faster, safer, easier. Optimized for Yahoo!
> Get it Now for Free! at http://downloads.yahoo.com/ca/internetexplorer/
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>
>
>
>>
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