You might find the following article of interest: http://www.sciencedirect.com/science/article/pii/S0301421509001323
It posits the question: "Batteries: Higher energy density than gasoline?"
In part due to these assumptions: "The energy density of batteries is two orders of magnitude below that of liquid fuels. However, this information alone cannot be used to compare batteries to liquid fuels for automobile energy storage media. Because electric motors have a higher energy conversion efficiency and lower mass than combustion engines, they can provide a higher deliverable mechanical energy density than internal combustion for most transportation applications."
So again my question, except for the lack of regeneration (which helps support the above statement) what is the difference between a boat conversion vs. an automobile conversion? What I was asking is: what are the practical differences, HP conversions, prop changes, battery storage locations/movement, etc. and except for the lack of regeneration, what is the downside that seems to keep any "speed boat" conversion from coming to fruition?
Clearly energy storage is a constraint. However my keel storage could easily contain 10 deep cycle 12v marine batteries, storage fore and aft could accommodate at least 8 more - that's some pretty deep cycle. 4.5 factor for a 48 volt system.
A Geo Metro automobile conversion, using an 18hp continuous, 49hp peak, 144v motor, with 10 - Deep cycle, flooded acid, 6v.s can do 65mph, and at 35mph has a 42 mile range.
My boat, with existing lower end I/O at a 2:1 gearing w/ reverse and a 120hp ICE, is a similar scenario - if I went with the same system (but more batteries) as the Geo, what might the consequences be? What else might I do? Prop changes for instance.
Any insights of that nature will be much appreciated.
Tim
> To: electricboats@yahoogroups.com
> From: luv2bsailin@yahoo.com
> Date: Wed, 18 May 2011 16:58:11 +0000
> Subject: [Electric Boats] Re: conversion
>
> Start by doing some research on energy density of storage batteries vs. petroleum fuel. There are many posts in this forum on the subject.
>
> --- In electricboats@yahoogroups.com, "tajw50" <tajw@...> wrote:
> >
> > I'm new to the idea of electric boat conversion but familiar with auto EV conversion. Aside from no regenerative breaking benefits why wouldn't one just convert, as per an auto?
> > I have an I/O (force L drive) that is essentially a 125 hp outboard, mounted atop and I/O lower drive unit. There is some battery storage capacity below deck in the keel and several other areas.
> > Couldn't the upper end outboard type gas motor just be replaced with a similar hp electric motor? and controller etc.
> > What issues or constraints are unique to boat vs. auto conversion?
> >
> > thanks for any insights.
> >
>
>
>
>
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