Hi Eric,
The idea is that an electric motor + small 8-10Kw diesel + electronics +
batteries + small gas tank will = the size and weight of a 30Hp pusher
diesel + large gas tank and the hope is that it will all cost the same, or
more reasonable, no more then 25% extra.
For example, I've recently priced a new Kubota 9Kw, liquid cooled diesel for
$2800 and a Yanmar 3G 30Hp for $9000. That's $6000 of wiggle room to pay
for the electrical side - and I'm looking at retail prices.
Reality is that there is no complete package being manufactured today that
meets these specs. Emotion and Ossa are the closes but with each starting
in the $25K region, not worth while unless your boat is worth $100K or more.
I'd be careful of the Yanmar GM20 as a pusher diesel. This is only an 18HP
engine, suitable for most boats 27' or less.
DaveH
-----Original Message-----
From: electricboats@
On Behalf Of Eric
Sent: Thursday, August 13, 2009 5:17 PM
To: electricboats@
Subject: [Electric Boats] Re: Diesel Generators for electric conversion
Great ideas.
However, my prioritized constraints are weight and size, followed by cost.
So what are our options?
Weight of 48V 200ah battery bank?
Size and weight of 48V 100A diesel generator?
Total area of 48V 5A solar array?
Size and weight of 48V 20A wind generator?
Total cost of system including the traction drive system?
Will all of this fit on a boat that can be driven at 80% hull speed by an
electric motor that draws less than less than 4.8KW continuous?
If so, what happens to the sailing performance of the boat? (just in case
one wants to spend a little time with the motor off)
Compared to this solution; a Yanmar GM20 is lighter, smaller, more reliable,
more powerful, cheaper and simpler. But it's not as cool without the silent
running capability, as long as we don't count sailing.
Don't get me wrong, I really want to go electric. Check my intro post for
info about my potential project.
Eric
--- In electricboats@
>
> Dave,
>
> Hear here! 48VDC, 100A marine diesel generator, 200(+) AH battery bank,
5(+) Amp solar charging, 5(+) Amp regeneration, 20(+) Amp wind generator,
brushless (AC) or brushed (DC) motor sized for the boat to 80% hull speed
continuous, all competitively priced and sized.
>
> Where can we buy such a system? It seems to me your humble opinion is
right on target!
>
> Mark Stafford
>
>
> --- In electricboats@
wrote:
> >
> > 4KW @ 48v = 100A (minues losses, etc). Looking at the torque curve for
say
> > the Perm 132 @ 48v/100A = 20Nm with a rotational speed of 2203RPM. So,
if
> > you had an ICE with the same output, how fast would your boat go given
the
> > various weather conditions? That's the simple math. IMO, as long as
the
> > electrical system matches the ICE system (or does better) you will have
the
> > same performance with the benefits of using only electric (hopefully) a
good
> > portion of the time - meaning total cost of ownership goes down.
> >
> > The challenge is the components. How do you get 48v from a generator
into
> > the motor without going through the batteries, and if you did go through
the
> > batteries, how do you prevent overcharging? Then, how do you get a 48v
> > battery bank to run it when not using the generator and how do you
charge
> > the bank (AC, 48vDC, solar)? All the variables mean more components,
which
> > drives the cost up and makes the system vulnerable to breaking down.
> >
> > IMO, the ideal system is a 48v bank ~400AHr, 48v DC generator, solar
panel
> > or wind generator inputs and all the components that make it work
integrated
> > into 1 box (possibly liquid cooled). When the bank gets past 50-80%
> > (depending on battery type), the generator kicks in and does the bulk
> > charging. The wiring is plug and play and it all fits in a space equal
to a
> > normal ICE engine. I think the electric motor and components have come
a
> > long way towards this goal in the past few years but literally no work
has
> > been done on the generator side.
> >
> > DaveH
> >
> >
------------
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