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.
>
>
>
>
> 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.
>
> --- On Wed, 7/15/09, Chris Witzgall <chris@witzgall.
> <mailto:chris%
>
> From: Chris Witzgall <chris@witzgall.
> Subject: [Electric Boats] The missing link in "affordable" diesel electric
> To: "electricboats@
> <electricboats@
> 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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