T-Pain Is On A Boat: Re: [Electric Boats] Holiday Mansion Conversion

Wednesday, May 12, 2010

Re: [Electric Boats] Holiday Mansion Conversion

JJ,

Your math is pretty close (it's 0.083 gallons can produce one hp for one hour in a four stroke gasoline engine operating at it's efficiency peak) so say 10 hp per gallon per hour. One gallon (6 lbs) of gas can produce the same mechanical energy as about 5,000 lbs of lead acid batteries. That's why easy to propel displacement boats are the only practical candidates for electric power.

However, I don't see what "only" 50 hp had to do with your difficulty navigating through a lock. It would surely be enough to push you into a 15 - 20 kt headwind. Was your problem that you needed two drives, as the boat originally had, to steer?

Denny

----- Original Message -----

From: JJ & Irene

To: electricboats@yahoogroups.com

Sent: Wednesday, May 12, 2010 12:16 AM

Subject: [Electric Boats] Holiday Mansion Conversion

I have to agree that your Holiday Mansion is NOT a good candidzate for electric power. Several years ago I repowered one with a 50hp outboard. Traveling across South Lousiana I was pinned aganst the forebay wings while entering a lock, by a 15 knot beam wind. The lock master had me pulled off but would not let me enter the lock unless I was under tow.

I was carring 100 gallons of fuel and had a full 50 hp at my disposal, can you imagiune what this would have been like with the limited capacity of a battery pack and much less powerful electric motor. 750 watts is the electrical equivelent of 1 hp. To produce 1 hp with a internal combustion engine requires burning .06 gallons of gasolime, if my memory serves me correctly. To produce 18 hp for 1 hour you will burn 1 gallon of gas. Ekectricallly this is the equivelent of 18 X 750 or 13500 watt-hours at a depth of discharge of 100% or 135 100 ah batteries. It would take 13,500 100 ah batteries to equal my 100 gallons of fuel. And that is at a DOD of 100%.

Sure hope I got my math right.....

Jewel (aka JJ) & Irene Johnson

Rockport, Texas

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