T-Pain Is On A Boat: Re: [Electric Boats] Hardy VFD

Monday, August 3, 2009

Re: [Electric Boats] Hardy VFD

Although I would want a little more then the 12000 watt 460 Volt AC 26
Amps setup you want! I would want around 240 Volt AC and 300 amps!

You could get close to your setup buy two 5000 watt off grid inverters
(Magnum Energy MS4448-AE) and run them in parallel for 240 V AC at
40 amps.
Then buy an off the shelf 240 Volt variable speed motor and
controller. Hmmm anyone know a good source for 240 Volt AC motors
and controllers?

On Aug 4, 2009, at 12:26 AM, James Sizemore wrote:

> I'd pay $4000 for one right now. The only caveat would be you could
> not use lead-acid with it. The Peukerts effect would cripple your amp
> hour rating. The amp draw per cell would be astounding. But again I
> would buy one right away! Then I could have one simple high amp hour
> LiFePo4 48V bank instead of six lower amp hour 48v banks that I need
> right now. Easier to charge easier to wire, less connections to fail.
> Would all around make my life less complicated!
>
> On Aug 3, 2009, at 11:10 AM, Mark Stafford wrote:
>
> > Chris S,
> > You have a great idea and product potential: 48volt DC in, variable
> > three phase 460 AC voltage out. 250amp DC continuous, 750amp max
> > draw. This "Hardy VFD" (your email name) would match many batteries,
> > many AC motors, many gensets, under 70' sailboats and under 20'
> > runabout powerboats. Most importantly from a sales volume
> > perspective, this imaginary VFD could crack the huge recreational
> > fishing market (primary & trolling propulsion from the same motor/
> > prop with genset support for distance).
> >
> > Any manufacturers interested?
> >
> > Mark Stafford
> >
> > --- In electricboats@yahoogroups.com, "hardy71uk" <p0054107@...>
> > wrote:
> > >
> > > I predict that AC motors WILL become universal in cars and
> > boats .AC controllers are now readilly available from industry .What
> > we really need to make it easy is a controller than takes a low
> > voltage DC in direct from your batteries and puts out a variable
> > three phase Ac Line voltage to power an inexpensive standard rugged
> > induction motor.Thats to say the missing link is a variable
> > frequency low to high voltage inverter (VFD)
> > >
> > > Chris S
> > > --- In electricboats@yahoogroups.com, Matthew Geier <matthew@>
> > wrote:
> > > >
> > > > Arby Bernt wrote:
> > > > > Locomotives use AC drive systems due to the complexity of
> > coupling the engine to the drive wheels. Before AC coupling was
> > available, the slip between the drive wheels and the track was
> > nearly impossible to control, as the friction of a non-slipping
> > drive wheel can transmit more force than than a slipping wheel. By
> > comparing the rotation of a drive wheel to a static wheel, the speed
> > difference can be maintained at under 0.5%.
> > > >
> > > > Most of the world's railway 'diesel electrics' are DC motored.
> AC
> > > > motors have only come in over the last 10 years and then only at
> > the big
> > > > end. Railways have been reluctant to switch from series DC
> motors.
> > > > 'Switchers' would still mostly be series connected DC motors, AC
> > > > traction motors are still working their way down the feeding
> > chain.
> > > >
> > > > Even then they are not all induction motors - the French were
> > big on
> > > > Synchronous motors with slip rings for a while - I presume so
> > they could
> > > > control the current in the rotor coils.
> > > >
> > > > EMD apparently built their first AC motored locomotive in 1987,
> > but the
> > > > first big order wasn't till '93. The same source says at 2005 ,
> > 50% of
> > > > the market was still DC motored, EMD's split was 60% AC, 40%DC.
> > > >
> > > > Sounds sort of like us electric boaters - those 'new fangled AC
> > motors'
> > > > are still not quite trusted yet :-)
> > > >
> > >
> >
> >
> >
>
> [Non-text portions of this message have been removed]
>
>
>

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