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Old 10-10-2013, 04:44 PM   #1
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fast for electric outboard

interesting, goes well for all electric must have some batteries in there.

http://www.youtube.com/watch?feature...&v=fpNej1Q35ow
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Old 10-10-2013, 07:05 PM   #2
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Another

Cool!
This isnt too bad either!
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Old 10-10-2013, 07:20 PM   #3
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That is pretty awesome!!
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Old 10-10-2013, 09:07 PM   #4
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I think this needs clearing up. To make 180hp for even 15 minutes takes a massive complement of batteries. Lithium Ion or Lithium Polymer have the best capacity/ weight density's. 746 watts equals 1 horsepower less motor efficiency which on todays brushless motors can be as high as 90%. About 150,ooo watts for 180hp. Volts x amps=watts.
I found some Lithium Ion 12 volt batteries on the net which are 300ah. They cost $3500 each. To get anywhere near the power needed without running major amps voltage needs to be upped, say to 360. At 360 volts we will need 420 amps. 360 x 420 / 746 x 0.9 = 182 hp.
30 x 12v batteries will be required. I theory this will give 360 volt 300ah pack, notice I said theory, in practice you won't get an hours capacity pulling 300 amps.
We are now at a cost of $105,000. We have the power to pull 180 hp now but not the capacity for an hour. About 43 minutes.
I am sure there are custom battery packs available at a more reasonable cost but you are still looking at a shedload to run for any sensible amount of time.
To put a further emphasis on this point a gallon of Petrol (US) has 124,000 BTU's
A Kilowatt Hour of electricity has 3,412 BTU's
Been a long day so I hope the math is correct, but you get the idea.
No electric powerboats in the near future!
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Old 11-10-2013, 11:08 AM   #5
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this is pretty cool
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Old 11-10-2013, 11:11 AM   #6
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Old 11-10-2013, 01:34 PM   #7
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Forgot to mention, the batteries are good (low internal resistance) for 3 to 5 years.
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Old 11-10-2013, 02:27 PM   #8
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this is pretty cool
Cool! Anymore on it?
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Old 11-10-2013, 03:47 PM   #9
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Mike, your too modest, 98+mph rocks :

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Old 11-10-2013, 09:12 PM   #10
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Cool! Anymore on it?
http://www.teamscarab.com/resources/level-2/kona-17.htm
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Old 13-10-2013, 03:44 PM   #11
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Cheers!
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