[Public-list] RE: ELECTRIC DRIVE

Thu Sep 16 11:41:11 PDT 2004

Roger -

If we assume we don't want to run the generator much when we're not
motoring, then the generator has to put out at least 5 HP (down from the
15HP I began with!) at the low end. That's 3.73 kW. I looked up marine
generators on http://usdieselengines.com/ and a 3.5 kW model costs about
$4200 and
occupies  31" x 17.5" x 18 ". You would still have to acoustically isolate
it, cool it and exhaust it, so I can't see how it can quite fit in the
hanging locker. It weighs about 215 lbs dry. It also puts out 120V AC so you
need inverters,

I can imagine designing a yacht from scratch with such a system in place. I
would save it for a large boat, where the genset could be placed amidships
and low. Still plenty of design and arrangement issues, but attractive for
modularity.

In the interest of full disclosure, I am a naval architect, though I've not
been involved in yacht design. I will "out" J Bergquist too, since he went
to the same school I did (though MUCH later).

Mike
Rinn Duin #272

-----Original Message-----
From: public-list-bounces at alberg30.org
[mailto:public-list-bounces at alberg30.org]On Behalf Of Roger L. Kingsland
Sent: Thursday, September 16, 2004 10:46 AM
To: Alberg 30 Public List -- open to all
Subject: Re: [Public-list] RE: ELECTRIC DRIVE

Albergers,

I looked into electric a few months ago and got great response from
http://www.ev-america.com/.  Also,
http://www.eboat.org/forum/index.php?action=profile;user=Roger seems to be a
pretty good forum on the subject.

One approach is not to increase battery storage but to have adequate power
sources (generator, solar, wind, propeller) for the applied load.  It seems
natural power sources (wind, solar, propeller) are not sufficient to sustain
long term propulsion so the alternatives are to add lots of heavy batteries
or include a generator. If I needed to repower, I would seriously look into
a generator (possibly mounted in the locker opposite the head where it could
be well insulated) powering an electric motor in the engine compartment.
Space taken by the generator would be mostly be made up by space saved aft.
I think the biggest advantage is the efficiency of power delivery to non
propulsion systems (fridge, freezer, air conditioning, radios, instruments,
radar, home entertainment system, microwave, satellite telephone, my wife's
computer collection, my George Foreman sandwich grille).  I understand
alternators only charge efficiently at higher RPMs and engines (at least
diesels) suffer if not run at 75% of full RPM or higher.  Therefore,
charging batteries works best only when motoring (unless you idle the motor
at 2000 RPM).  With a generator, one could run it at maximum efficiency
whenever the batteries need to be charged or when under propulsion.  The
battery capacity could be just enough to handle the overnight load (probably
about the same as needed with engine propulsion).

Any thoughts

Roger L. Kingsland, AIA
Managing Partner
Kingsland Scott Bauer Associates (KSBA)
N40° 27' 49"  W79° 57' 59"
3441 Butler Street
Pittsburgh, PA 15201
www.ksba.com

1(412) 252-1500 X101 - Office & Voice Mail
1(412) 779-5101 - Mobile (no voice mail)
1(412) 252-1510 - Fax

----- Original Message ----- 
From: "William Wallace" <tristan at one.net>
To: "Alberg 30 Public List -- open to all" <public-list at alberg30.org>
Sent: Tuesday, September 14, 2004 10:18 PM
Subject: Re: [Public-list] RE: ELECTRIC DRIVE & Triton, ONDINE

> Check out these Electric Drives!
>
> http://www.rayeo.com/ Electric Outboard
>
> http://pages.intrstar.net/~brb/submot.html
>
> Scott Wallace, Rhodes Meridian
>
> P.S. we found a Pearson Alberg designed Triton, Ondine, in our
> midwestern boat yard north of Cincinnati, from Delaware...anyone know
> of her past?
>
> The boatyard guys accused me of drawing and attracting strange older
> ocean sailboats to their yard of predominately Hunter, Catalina and
> McGregor boats!
>
> Now they have our Rhodes Meridian, a Pearson Triton and another old
> full keeler, that reminds me of a Dana 24!
>
>
> On Tuesday, September 14, 2004, at 12:50 PM, George Dinwiddie wrote:
>
> > Yes, the advantage of electric is not performance, but silence.  I knew
> > a naval architect on the CompuServe Sailing Forum who was considering
> > building a hybrid launch with a small gas motor in a well-insulated,
> > well-isolated box generating the electricity.  The concept was a bit
> > bulky for a typical sailboat, though.
> >
> >  - George
> >
> > On Tue, Sep 14, 2004 at 12:20:19PM -0400, Gordon Laco wrote:
> >> That actually sounds pretty good!
> >>
> >> Gordon #426
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>> The manufacturer sent me an estimate based on the size, shape and
> >>> weight of an
> >>> A30.  He recommends an an OZtwin motor, a battery pack (8 pcs of
> >>> Leoch fiber
> >>> battery, 110 Ah each) that will provide 4 knots cruising speed with
> >>> about 8
> >>> hours range. Full speed will be approximately 6½ knots and the range
> >>> will be
> >>> about 1 hour.  Recharging is while underway (at a slow rate) or more
> >>> rapidly
> >>> while plugged into shore power at the dock.  The performance is not
> >>> great, but
> >>> it is the cost that really puts this option out of the box.  The
> >>> cost of the
> >>> total system is about $7,000.00 US.  John Manza
> >>> _______________________________________________
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> >>
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>
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