[Public-list] ELECTRIC DRIVE

[Don Campbell]

The specifications on the website indicate 24 v DC  at 2 kw, 4 kw alt, 5 kw.
with 82-93% efficiency both as a generator and motor.

That would allow for a  max of  5000 / 746 = 6.7 HP  or 6.7 x 0.93 = 6.2
available HP.

This is too small a motor for an Alberg 30 but might be  interesting for an
Alberg 22
Don


"Meinhold, Michael J" wrote:

> A simple way to see if this is a practical system is to compare the rate at
> which you generate power the rate at which you use it.
>
> Here is the charging rate vs speed from the website :
> At 4 knots = 1-2 amps
> At 5 knots = 3-5 amps
> At 6 knots = 7-12 amps
> At 7 knots = 14 - 20 amps
>
> Let's say we get 3 amps.
> 3 amps * 12 volts = 36 volt-amps = 36 watts
>
> I will guess the A30 needs about 15 of it's 30 hp to go 4 knots. I am
> willing to believe the Oz motor and prop will be more efficient, so let's
> say it only needs to deliver 10 hp to go 4 knots.
>  10 hp * 746 watts/hp = 7460 watts
>
> 7460 watts powered / 36 watts sailing = 207 minutes of sailing for every
> minute powered. If I take 10 minutes at each end to get in and out of the
> dock, then I have to sail for 4140 minutes or 69 hours to charge back up.
>
> It would appear that this system can't be independent - you need another
> source of power to use it.
>
> Mike
> Rinn Duin #272
>
> -----Original Message-----
> From: public-list-bounces at alberg30.org
> [mailto:public-list-bounces at alberg30.org]On Behalf Of Phil Prosser
> Sent: Tuesday, September 14, 2004 9:52 AM
> To: 'Alberg 30 Public List -- open to all'
> Subject: RE: [Public-list] ELECTRIC DRIVE
>
> What would be the range on that I wonder?  It could not be unlimited, since
> perpetual motion is not possible... Right???
>
> -----Original Message-----
> From: public-list-bounces at alberg30.org
> [mailto:public-list-bounces at alberg30.org] On Behalf Of Manza, John LtCol
> Sent: Tuesday, September 14, 2004 8:13 AM
> To: public-list at alberg30.org
> Subject: [Public-list] ELECTRIC DRIVE
>
> I plan to replace my old gas engine and I want to be open to all options.
> One that I am considering is an electric drive.  The following link leads to
> a demonstration that is pretty interesting by a manufacturer in Sweden that
> runs like any electric engine, but recharges the batteries when the boat is
> sailing.
> http://www.ozecodrive.com/english/index_e.html
> Has anyone in the group seen an electric drive in action?  John Manza "Jante
> II" # 150 _______________________________________________
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