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@
>
> 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
>
>
> -----Original Message-----
> From: electricboats@
> On Behalf Of rebollo.angel
> Sent: Monday, August 10, 2009 12:30 PM
> To: electricboats@
> Subject: [Electric Boats] Re: Diesel Generators for electric conversion
>
> Everything said makes sense. However, considering one can get a used
> generator and some of them might be in good shape, for 1/3 to 1/2 the cost
> of a new one, if I were to do that, would a 4KW suffice for a 48 volt
> system? My idea is just to have a back up that the electric motor can run
> off if the batteries are all used up.
>
> Thanks!!
>
> Angel A. Rebollo
>
> --- In electricboats@
> >
> > I concur Dave -- the cost is prohibitive and hard to see how they can
> > justify the prices..
> >
> >
> > On Aug 7, 2009, at 2:24 PM, Dave Hackett wrote:
> >
> > > I've certainly thought of it and do plan to do something along those
> > > lines,
> > > however I can't understand how they charge $10K+ for an 8KW diesel
> > > generator
> > > when I can buy a new 30HP pusher diesel for that price. If the
> > > generators
> > > were in the more reasonable $3-$5K range, I think a lot of us would
> > > have
> > > been buying them.
> > >
> > > DaveH
> > >
> > > -----Original Message-----
> > > From: electricboats@
> [mailto:electricboats@
> > > ]
> > > On Behalf Of rebollo.angel
> > > Sent: Friday, August 07, 2009 2:35 PM
> > > To: electricboats@
> > > Subject: [Electric Boats] Re: Diesel Generators for electric
> > > conversion
> > >
> > > I take it nobody has a diesel generator onboard, or have thought about
> > > adding one? Any opinions?
> > >
> > > Thanks!
> > >
> > > Angel A. Rebollo
> > >
> > > --- In electricboats@
> > > wrote:
> > > >
> > > > Hello, I have a Catalina 30, and I have been reading the messages
> > > from
> > > this fantastic group for the past couple of months. I have not
> > > decided yet
> > > on which electric motor to use, what type of batteries to use, etc...
> > > However, I learned about the 1 gallon of fuel rule, and in the
> > > interest of
> > > safety, I am looking for a genset (we are planning in cruising in the
> > > Bahamas next year).
> > > >
> > > > Right now there are very attractive prices in South Florida for
> > > marine
> > > gensets, and I am seriously thinking to buy one if I get the right
> > > price.
> > > Later on, I will get the electric motor and batteries. Given I have
> > > a 1989
> > > Catalina 30 MKII, 30 feet, what characteristics would you be looking
> > > for on
> > > a diesel generator? DC only, AC only, DC/AC, 110 & 230 volts, 12
> > > volts as
> > > well, how many kilowatts, remote start, sound guard, brand, etc... Any
> > > advice provided will be welcome. Some models I have seen for sale are
> > > Westerbeke 7.6BTD, and Kohler Diesel 3.5 or 4EOZ.
> > > >
> > > > Best regards,
> > > > Angel A. Rebollo
> > > >
> > >
> > > ------------
> > >
> > > Yahoo! Groups Links
> > >
> > > No virus found in this incoming message.
> > > Checked by AVG - www.avg.com
> > > Version: 8.5.392 / Virus Database: 270.13.38/2274 - Release Date:
> > > 08/07/09
> > > 06:22:00
> > >
> > >
> > >
> >
> > Lamar Felder
> > lamarfelder.
> > 713 517 0516
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
>
>
>
> ------------
>
> Yahoo! Groups Links
>
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 8.5.392 / Virus Database: 270.13.49/2294 - Release Date: 08/10/09
> 06:10:00
>
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch format to Traditional
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe
No comments:
Post a Comment