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post #11 of 160 Old 11-25-2009
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While electric power may make sense for a daysailer, it isn't a good idea for a cruising boat. If the boat requires moving under power in hazardous conditions for prolonged periods of time, the real problem is that the electrical bank can not be easily replenished. If the generator is large enough to power the motor without the aid of the battery bank, then there is little in the way of weight or energy savings.

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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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Last edited by sailingdog; 11-25-2009 at 11:58 AM.
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post #12 of 160 Old 11-30-2009
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[I am very interested in electric conversion. Cd you send me your email address:

Vendors for electric motors, batteries and controllers.
Install checklist
Cost range. I need no more than 10hp equivalent.

My boat is a 1980 Hunter 27.

Thanks.

David Miller
[/email]UOTE=JCR;539576]Just some feedback about electric sailboat motors.....

I have some 1st hand knowledge of electric propulsion and maybe can answer questions you may have.

1. Electric boat conversions are not difficult to do.

2. They provide you with many advantages over gas & diesel motors.

3. Electric boat motors are regenerative if they are designed properly; meaning that they will recharge the batteries when you are sailing.

4. Electric boat drives are clean, almost maintenance free and easy to use.

5. Electric boat drives installed in sailboats typically can be charged overnight and maybe much shorter times and the cost can be very low like $1.50 per charge.

JCR[/QUOTE]
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post #13 of 160 Old 11-30-2009
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Well

If you follow the JCR links you will find like 4 to 8 boats that max out at about 20 miles

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Last edited by tommays; 11-30-2009 at 03:41 PM.
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post #14 of 160 Old 11-30-2009
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What are JCR links?

I do know that my Ericson 27 with a 200 amp hour reserve (two sets of four 12 volt agm's) will go at least 60 miles at 4 knots boat speed. Probably a fair amount farther. There is a SolidNav Explorer on a Bristol 32 in New York getting 100 miles.
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post #15 of 160 Old 12-01-2009
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Quote:
Originally Posted by utx1977 View Post
[I am very interested in electric conversion. Cd you send me your email address:

Vendors for electric motors, batteries and controllers.
Install checklist
Cost range. I need no more than 10hp equivalent.

My boat is a 1980 Hunter 27.

Thanks.

David Miller
[/email]UOTE=JCR;539576]Just some feedback about electric sailboat motors.....

I have some 1st hand knowledge of electric propulsion and maybe can answer questions you may have.

1. Electric boat conversions are not difficult to do.

2. They provide you with many advantages over gas & diesel motors.

3. Electric boat motors are regenerative if they are designed properly; meaning that they will recharge the batteries when you are sailing.

4. Electric boat drives are clean, almost maintenance free and easy to use.

5. Electric boat drives installed in sailboats typically can be charged overnight and maybe much shorter times and the cost can be very low like $1.50 per charge.

JCR
[/QUOTE]

David,

I have a new brushless 5kw motor, controller, reducer and motor mounting hardware if you are interested. Perfect fit for your sailboat.

JCR
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post #16 of 160 Old 12-01-2009
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Quote:
Originally Posted by LaNinfa View Post
Does anyone have any info on electric Sail boat motors. Re: which is the best etc. I am looking to put together a system using the Mars brushless motor. Is there a better motor out there. Our boat is a 27ft Catalina. Any info would be appreciated.
How is your electric sailboat project going
JCR
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post #17 of 160 Old 12-02-2009
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David,

I have a new brushless 5kw motor, controller, reducer and motor mounting hardware if you are interested. Perfect fit for your sailboat.

JCR[/QUOTE]

How do you compare kw to HP?
What would this system weigh in at?
I am planning to replace a 20HP diesel engine with
an electric propulsion system. I would like the total
weight of the electric, including the battery bank to
be substantially lighter than the diesel. I plan to
drive the existing Saildrive with a belt.
The motor will only be used for maneuvering out of
the slip, sailing commences immediately after.
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post #18 of 160 Old 12-02-2009
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COOL,

740W/HP. For example, a 20hp engine could be replaced with a 15kw motor (make sure that is the continuous rating). You need to make sure you gear it correctly though which shouldn't be too hard with a belt. The trick with a belt is that you need to add a bearing to the shaft.

The weight in the system primarily is in the batteries. I would guess that you can get a motor and mounts to be 75lbs and another 75lbs for the charger, controller, contactors, and wiring. Having it be lighter than the diesel is probably not realistic if you want it to propel you anywhere.

Figure out how much power you expect to use for how long and you can get the KWH requirement for the batteries. Then you can look at batteries and figure out what you need/what weight. You will have to get a battery pack that allows you to configure it so that the voltage is compatible with the motor (usually 48,72,120,or 156V, higher is better for efficiency and smaller battery cables). There was another thread here that touched on this subject and I did a very basic calculation for a 15kw motor run at WOT for 2 hours and found you would need 18 Trojan T-105 batteries(I hope I am remembering that right). Now if you throttled back to 5kw, you would only need 1/3 the battery capacity. Lead acid batteries are not great for energy/weight but they are often used since they are the cheapest. If you went with 8 of these batteries in series, you could use 48V components and you would be able to get in and out of the slip just fine but you would have a few hundred pounds tied up in batteries. This combo would probably get you home 10 miles in flat calm conditions on a 30 footer as well.
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post #19 of 160 Old 12-02-2009
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Cool

The conversion is 1 KW = 1.34 HP so the 5 KW Motor = 6.7 HP
The 5KW motor/mounting bracket/controller/reducer weigh 58.5 lbs
The motor/controller requires 48 volt batteries.
The battery modules I use are 12.8 volts x 100 AH each and weigh 29 lbs.
Tell me more about your boat, engine, propeller shaft speed and the existing saildrive.

JCR

Last edited by JCR; 12-02-2009 at 07:44 PM.
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post #20 of 160 Old 12-02-2009
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jcr just wondering are you connected with a company or are you just a knowledgeable person
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