[Public-list] electric repower

[Meinhold, Michael J]

Most of the websites offering electric propulsion neglect to discuss a power
source or power storage.
Getting a reasonable motoring range out of batteries is the kicker with
electric propulsion .

The energy density of gas is about  6. kilowatt-hours / pound, and it weighs
about 6.2 pounds/gal, 
so my 10 gallon gas tank stores 6*6.2*10 = 372 kilowatt-hours. I think I
have a range of about 35 NM (more experienced A30/A4 owners can correct me) 

The energy density of a Lead-acid battery is about 0.03 kilowatt-hours /
pound. So to match the range provided by the gas tank, I'd need 372 / 0.03 =
12,400 lbs of batteries. 

An electric drive has the potential of being a lot more efficient, but it's
not going to solve this problem. 



-----Original Message-----
From: public-list-bounces at alberg30.org
[mailto:public-list-bounces at alberg30.org]On Behalf Of J. Brown
Sent: Tuesday, June 07, 2005 12:52 AM
To: Alberg 30 Public List -- open to all
Subject: Re: [Public-list] electric repower



I'd go for it if I had the money but it is much more expensive and a lot 
more expensive if you want the same power (max hull speed).

I like the set up these guys offer: http://www.solomontechnologies.com/

On the other hand if all you use the inboard for is to get you in and out 
of a small easy harbor on nice days then it should be considered because 
you wouldn't need to spend lots of money for that kind of duty.

Here are some incomplete thoughts I had on the subject: 
http://www.jb0713.com/sail/engine/electric.htm

Haefen

At 03:45 PM 6/6/2005 -0700, you wrote:
>as many know, i have been slowly moving towards repowering from gas to 
>diesel. then i started thinking about going to electric. stumbled on ngc's 
>website, and now see their name as a sponsor for the alberg 30 site. 
>looked to see if anyone has done this in the group but found no refernces. 
>so, has anyone had any experience in this area? diesel smell has always 
>nauseated me so this method has a lot of appeal
>constructive comments are welcome
>dan
>
>
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