JJ,
While I agree with your sentiment, your math is a little off. While the scientific conversion of gasoline is 33kWh of energy, your value of 13.5kWh/gal does factor in an improvement of electric drive efficiency, I often use 10kWh/gal for this type of estimate. Based on your conversion of 1 gallon equals 13.5kWh, 100 gallons would be 1,350kWh. One 12v 100Ah battery is 1.2kWh, so 1,350kWh would be 1,125 100Ah batteries. That's still a whole lot of batteries. :)
On the whole houseboat conversion thing, I think that your story shows the importance of both raw power and twin screws to maneuver these boats in any sort of adverse conditions. I would probably go with a minimum of a pair of 30 - 50 hp hi-thrust outboards, or just repair the drives that came with the boat.
Fair winds,
Eric
Marina del Rey, CA
--- In electricboats@
>
> 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
>
> Heal the Past,
> Live the Present,
> Dream the Future.
>
> Always Be Safe
>
>
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