This works on the same principle as a computer UPS. In a UPS, the computer
runs off the batteries at the same time as the charger charges the
batteries.
Larry
-----Original Message-----
From: electricboats@
On Behalf Of Colin Girvan
Sent: Friday, July 17, 2009 11:22 AM
To: electricboats@
Subject: RE: [Electric Boats] The missing link in "affordable" diesel
electric
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.
<mailto:ak%40twcny.
From: Alycia & Kevin Miller-Lynch <ak@twcny.rr. <mailto:ak%40twcny.
com>
Subject: RE: [Electric Boats] The missing link in "affordable" diesel
electric
To: electricboats@ <mailto:electricboa
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:electricboa
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]
>
>
>
>
>>
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