Re: M_Boats: dc vs ac drive

[MC Carpenter]

Invertor conversion efficiency is only high at a single point in a complex 
curve. Example a Trace Invertors, 1500 watt can have a conversion of 91.7% 
but at its constant  or continual use position rating ( bit more than a  1/3 
or in this case 600 watts is less than 47% conversion Efficiency.

----- Original Message ----- 
From: "Harvey G Wilson" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Sent: Sunday, November 28, 2004 8:12 PM
Subject: Re: M_Boats: dc vs ac drive


Hi Richard..
However you could use an inverter to produce ac from 12v dc, they have
about 92% conversion efficienct.<<
That you could.  IIRC, 1hp is about 750 watts.  Dunno how this would
translate into thrust..guess it would depend on the propeller<GG>
Inverter cost would be high if it'll take 2hp to drive the boat at a
reasonable speed..say at least as well as a 55 pound thrust trolling
motor.
Then, what would the motor size be?? bigger then the 55 pound trolling
motor, I'll betcha<GG>
Interesting thought, but I'll stick to my noisy Seagull.
 Harvey/ Ga
M-17  Stargazer  #294
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