T-Pain Is On A Boat: Re: [Electric Boats] Electric conversion concepts

Sunday, April 11, 2010

Re: [Electric Boats] Electric conversion concepts

Joe,

I use a motor and controller from Golden Motor in China. They run good and are not too expensive. My reducer was a Planetary Reducer 3:1 from Onzio. These are available if you are interested.

John

John,

Could I please get more info on the actual products used?

Thank you,

Joe

Sent from my iPhone

On Apr 10, 2010, at 5:08 PM, John Raynes <johncraynes@gmail.com> wrote:

Red,

Here is actual running data on my electric boat conversion. The boat is a 26' old Pacemaker and she weighs 5,000 lbs. I re-powered her with a 5KW brushless DC motor and a 3:1 Reducer. The motor runs on two 48 Volt, 100 AH battery packs. I use one battery pack at a time which will give me about 2 hours running time. She will cruise 5 MPH at 50 amps.

John R

Fri, Apr 9, 2010 at 9:15 PM, peoria_diver <daredster@hotmail.com> wrote:

This is right along the lines of what I've been thinking about with solar. Generate as much power as possible with solar panels and wind generators and use the batteries to smooth out the use. That should make the batteries last a lot longer.

From what I've read/heard it takes about 300 watts to move 1000 lbs of boat at 3/4 of hull speed. Triple the watts to run at hull speed. It would be interesting to hear from experienced users to learn if this is a practical figure to make estimates with.

-Red

--- In electricboats@yahoogroups.com, "Roland" <lightdoesnotage@...> wrote:
>
> I too have heard that at speeds less than hull speed that electric is 4 to 6 times more efficient than ICE but that may just be misremembering what I read.
>
> A big advantage of electric is the ability to recharge via wind and solar. It is quite hard to make gasoline on your boat....you need to carry a 50 ton minimum drilling rig, a processing plant (maybe 100 tons?), and then of course you would have to be in a spot that has oil. :-)
>
> But seriously, 2KW of solar would be 12KWH per day minimum in the tropics, which would be like regenerating 1 gallon of gasoline a day for about 300 pounds of panels. If gas is 8 pounds per gallon, then on a 40 day trip the panels win out over the weight of the fuel. At $3 a watt the panels would be pricey, but they do last 25 years...
>
> Instead of thinking about carrying 8 tons of batteries and comparing that to ICE, what about carrying a means of regenerating a smaller bank of batteries, via wind or solar?
>
>
>
> --- In electricboats@yahoogroups.com, John Francis <surv69@> wrote:
> >
> > I'm curious to know if anyone can tell me how much energy(percentage-wise)
> > of top-rated energy(such as optimum RPM's for an IC motor & optimum RPM's
> > for an electric motor), a 26 boat(5000k) running at 1/2 hull speed, would
> > require with a gasoline engine and an electric motor, respectively.
> >
> > I know the answer is dependent on more information, but what I'm trying to
> > compare is if the economy(energy-wise)an electric motor running at much less
> > than hull-speed begins to somewhat approach the economy(energy-wise ) of an
> > IC engine, since the IC engine seems to require much more speed(RPM's) for
> > the same amount of torque of an electric motor.
> >
> > I'm hoping that the electric motor will result in a much lower percentage of
> > the optimum/maximum to go 1/2 hull speed than a gasoline engine would, such
> > that an electric motor at the lower speeds might be 5, 6 or more times more
> > efficient than an IC engine would be.
> >
> >
> > Just curious
> >
> > John Francis
> > Pearson 26
> > Port Clinton, Ohio
> >
> > On Thu, Apr 8, 2010 at 2:35 PM, Eric <ewdysar@> wrote:
> >
> > > Since we typically get new people on the list, I thought that it would be
> > > helpful to post some basic info about electric drive systems that should
> > > help get people's heads wrapped around this technology.
> > >
> > > A quick introduction to electric power concepts and terms:
> > >
> > > Energy is the ability to do work
> > >
> > > Power is the rate at which work is done
> > >
> > > Energy is related to your electricity storage, i.e. batteries. The size of
> > > your energy storage directly relates to your boat's range.
> > >
> > > Power is related your drive system. The rated size of your drive directly
> > > relates to your boat's cruising speed and acceleration under power.
> > >
> > > Energy equivalents: Gasoline contains about 33kWh of energy per gallon.
> > > Diesel is more dense and contains about 38kWh of energy per gallon.
> > >
> > > A 48V battery bank that is rated for 200Ah stores about 10kWh of
> > > electricity. Most comparisons between electric and ICE drive systems figure
> > > that electric drives are 2 to 3 times more efficient than fueled engines.
> > > If one considers electric drive 3 times as efficient, then the battery bank
> > > mentioned above holds energy equal to just less than 1 gallon of gasoline
> > > and only ¾ of a gallon of diesel. This is only true if one is wiling to
> > > drain the battery bank completely, doing so repeatedly reduces the life span
> > > of the batteries. Depending on the battery chemistry, accepted levels for
> > > depth of discharge (DOD) are from 50% to 75% of rated capacities.
> > > Therefore, a typical 48V 200Ah battery bank and electric drive has about
> > > the same usable energy as ½ gallon (2 liters) of gasoline through an ICE
> > > engine. A wet cell or AGM battery bank of this capacity weighs about 500
> > > pounds (225kg).
> > >
> > > Please feel free to correct any misconceptions, or add any additional basic
> > > considerations for those that are thinking about converting to electric
> > > drive.
> > >
> > > Fair winds,
> > > Eric
> > > Marina del Rey
> > >
> > >
> > >
> > > ------------------------------------
> > >
> > > Yahoo! Groups Links
> > >
> > >
> > >
> > >
> >
>