Diesel-electric hybrid - Page 2 - SailNet Community
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post #11 of 78 Old 02-19-2012 Thread Starter
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Maybe I'm not explaining my intentions very well. I love to sail, and on my old Cal 40 had minimum systems to contend with. I'm quite a bit older now and like certain creature comforts. I don't want or need a trash compactor, washer-dryer, etc., but do want a microwave (who doesn't) and a REAL watermaker that doesn't require constant membrane replacement, noisy, and low output of the 12 VDC types that are available. This means clean, reliable AC power, which is what pure sine wave inverters are for. Plus on the efficiency side, a diesel engine with its weak kneed torque curve is very inefficient at any rpm other than at the peak torque rpm. An electric motor is efficient through out its operating rpm range. The last ship (rig) I served on was a 32,000 ton off-shore drill ship that I held position over the hole with (6) 5000 hp electric motors. I had (7) 4.6 Mw generators that ran at their torque peak of 900 rpm (also divisible by 60 for frequency). If enviormental loads where high, i.e. 40 kt wind and 3 kt current, I could burn 1,000 gallons of diesel per hour to hold position. That may not sound efficient, but believe me if not diesel electric, it would consume much more, but again it couldn't be done without the low rpm torque of an electric motor. An electric has all available torque at 0 rpm, no IC engine can even come close.

To address Chef2Sail question on weight, it is expensive to keep the weight down, as you need to use LiFePO4 batteries. These cells, with proper care will have a 5000 cycle life at 80% DOD, so at my age, will outlast me. The diesel gen set is a large weight saver if you chose a unit that is a PM DC output over a conventional AC gen set.

This is a picture of that ship (rig) I described. Unlike Captain "Showboat" Schettino, my ship is butt ugly, so no need to salute an island with it. It is a diesel-electric hybrid, but mine will be scaled down a bit.

Bob
WL7GS Whiskey Lima 7 Gone Sailing

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post #12 of 78 Old 02-19-2012
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Hi, I guess you will be using ... lifp04 lite weight batteries and are you thinking of the Ausie elect outboards? .. Paul
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post #13 of 78 Old 02-19-2012
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I missed part of your message why not 48 volt high toque water maker only buy motor ONCE
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post #14 of 78 Old 02-19-2012
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Hi Bob,

Who are you buying the Li-ion bats from? Be careful with those things,remember what happened to the Chevy Volt. Those danged things will burn.

Cheers,

Scott
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post #15 of 78 Old 02-19-2012 Thread Starter
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There are a number of electric outboards currently available with new ones coming to market. The Torqeedo 4.0, a 4Kw unit from Germany is expensive and they are missing the boat (no pun intended) by not having regen. The amount of thrust matches a 9.9, which is what is used on PDQ 36s. AquaWatt outboards have the physical dimensions of a 9.9 and come in two flavors, a 13Kw (a pair of these are over kill on the PDQ) and a 23Kw.

aquawatt green power electric outboard motors

Note the weight difference between these DC gen sets vs an AC gen set. You won't find an 8Kw AC diesel gen set for 290 lbs like this DC unit.

http://www.propulsionmarine.com/wp-c...e-Brochure.pdf

Bob
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post #16 of 78 Old 02-19-2012 Thread Starter
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Quote:
Originally Posted by robmo View Post
Hi Bob,

Who are you buying the Li-ion bats from? Be careful with those things,remember what happened to the Chevy Volt. Those danged things will burn.

Cheers,

Scott
I have bought from these folks before building EVs. And these batteries are not the type with thermal issues.
Thundersky Lithium Batteries

Bob
WL7GS Whiskey Lima 7 Gone Sailing

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post #17 of 78 Old 02-19-2012
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Intresting and informative thread. Thanks. A freind was telling me about a electric sail drive out now that charges back into it's system when sailing. Motor/generator? can't remember the make darn it. check this one out... Vetus Electric Drive EP2200 - French Marine Motors Ltd

B.C. coast videos.
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post #18 of 78 Old 02-19-2012 Thread Starter
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Intresting and informative thread. Thanks. A freind was telling me about a electric sail drive out now that charges back into it's system when sailing. Motor/generator? can't remember the make darn it. check this one out... Vetus Electric Drive EP2200 - French Marine Motors Ltd
It is a hot emerging market with new players at every turn. It is too bad the Lagoon 420 series offered with electric drive was a rushed concept that some owners have pulled the motors and replaced with diesels.

Bob
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post #19 of 78 Old 02-19-2012
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I guess my general advice is falling on deaf ears.
Unrequested, unrequited, unhelpful....advice.
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post #20 of 78 Old 02-19-2012
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I applaud your approach, and while I am not ready for the leap to electric sailboat motors it will take you and others to keep plugging at making it work for the rest of us.

I have an on-line friend in SF Bay who has converted a 25ft double-ender to a 48volt electric system recharging at dock and reports usable power to the electric motor for at least 8hrs.

1970 Havsfidra 20 by Fisksatra
On the Delaware River at Fox Grove Marina Essington PA
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