Thursday, September 28, 2017

[Electric Boats] Re: changing an outboard to electric

 

Mine is about that same size motor, in 48 volt configuration.  Set on an Evinrude 50 twin size lower unit.  That works great, swings a 12.5 X 12 pitch prop.  Using Interstate SRM-29 batts.  Weight on boat is 1400 lb est.,  goes hull speed for a days cruise depending on weather  and passengers.  New boat is even better though.

Good Luck,  cal

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Wednesday, September 27, 2017

Re: [Electric Boats] Re: gear reduction transmissions

 

I just completed a 10 kw thunderstruck kit. I chose to mate it to a Browning  3201 helical gear drive.  I didn't  want to hear the high fequency whine of a belt drive configuration.

Bob

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[Electric Boats] Re: changing an outboard to electric

 

400A at 36 to 84V sounds like a lot more than 5.5HP. What is the approximate weight of the motor? I assume it is a brushed motor, from the Curtis controller. Maybe 400A is peak current, not sustained current?

If the motor weighs less than about 30lb it would be a shame to use such a heavy outboard carcass. Most 5kw to 10kw motors work just fine on about a 20HP unit. One advantage to the big outboard though, is the original prop would probably work a bit better than the stock prop of a 20HP unit. Your motor will spin a lot slower than the original gasoline engine at max revs. Anyway, the conversion ought to be fun and keep you busy for a while. Certainly, it should work. You will probably want to try a few different props and see which one suits you best at your typical cruising speed.

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Tuesday, September 26, 2017

Re: [Electric Boats] changing an outboard to electric

 

5.5 would be plenty to move the boat but you may not get up on plane. Talk to Scott Masterson he has done this already. I have a 3.5 hp cont or 10 hp Max that pushes my 26 sailboat just fine. But pushing and planing are two different things.


 

I found a 90Hp Force outboard on Craigslist with a blown motor(metal parts under cover).
The owner says the leg was working fine, but that the motor blew up.
I have read on the list that it is good to have a larger prop and use lower RPM.

I have a 16ft flat bottom deck boat from the 1970's with a 65HP evenrude motor.
The boat is rated for a 115HP motor, so I think the transom should be ok for the 90Hp.

I would only use this boat in sheltered waters and do not need to go fast.

Any suggestions as to how large an electric motor I should use.
I have access to a drive train from a DynastyIT Neighbourhood electrical car.
Its specs is a 5.5HP DC motor, and the controller is a curtis 1244-6401  36 to 84volt 400Amp.
in the car it is set at 72 volts with lead acid batteries.

The 5.5Hp sounds low, but the motor appears to be fairly heavy.
The thought is that the 90HP would easily take the weight of the 5.5HP motor.

Any sugestions?

If It isn't a good idea, I can look at other motor options too.

Thanks


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Posted by: Daniel Michaels <nov32394@yahoo.com>
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Re: [Electric Boats] changing an outboard to electric

 

just added a few pictures of the boat in album  deck boat


From: "mark.internet@yahoo.ca [electricboats]" <electricboats@yahoogroups.com>
To: electricboats@yahoogroups.com
Sent: Tuesday, September 26, 2017 1:35 PM
Subject: [Electric Boats] changing an outboard to electric

 
I found a 90Hp Force outboard on Craigslist with a blown motor(metal parts under cover).
The owner says the leg was working fine, but that the motor blew up.
I have read on the list that it is good to have a larger prop and use lower RPM.

I have a 16ft flat bottom deck boat from the 1970's with a 65HP evenrude motor.
The boat is rated for a 115HP motor, so I think the transom should be ok for the 90Hp.

I would only use this boat in sheltered waters and do not need to go fast.

Any suggestions as to how large an electric motor I should use.
I have access to a drive train from a DynastyIT Neighbourhood electrical car.
Its specs is a 5.5HP DC motor, and the controller is a curtis 1244-6401  36 to 84volt 400Amp.
in the car it is set at 72 volts with lead acid batteries.

The 5.5Hp sounds low, but the motor appears to be fairly heavy.
The thought is that the 90HP would easily take the weight of the 5.5HP motor.

Any sugestions?

If It isn't a good idea, I can look at other motor options too.

Thanks



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Posted by: Mark F <mark.internet@yahoo.ca>
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[Electric Boats] changing an outboard to electric

 

I found a 90Hp Force outboard on Craigslist with a blown motor(metal parts under cover).
The owner says the leg was working fine, but that the motor blew up.
I have read on the list that it is good to have a larger prop and use lower RPM.

I have a 16ft flat bottom deck boat from the 1970's with a 65HP evenrude motor.
The boat is rated for a 115HP motor, so I think the transom should be ok for the 90Hp.

I would only use this boat in sheltered waters and do not need to go fast.

Any suggestions as to how large an electric motor I should use.
I have access to a drive train from a DynastyIT Neighbourhood electrical car.
Its specs is a 5.5HP DC motor, and the controller is a curtis 1244-6401  36 to 84volt 400Amp.
in the car it is set at 72 volts with lead acid batteries.

The 5.5Hp sounds low, but the motor appears to be fairly heavy.
The thought is that the 90HP would easily take the weight of the 5.5HP motor.

Any sugestions?

If It isn't a good idea, I can look at other motor options too.

Thanks


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Posted by: mark.internet@yahoo.ca
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Monday, September 25, 2017

[Electric Boats] Re: Electric Boat Race and Regatta

 

Event copied and promoted on https://www.facebook.com/groups/549111295238164/ 
Please join if not a member already!
Cheers,

Rob Kay
Secretary
Electric Boat Association
104 Stirling Rd, Kilsyth,
G65 0HY
http://www.eboat.org.uk



Home:
Mobile: 0792 2692493
Landline and ansaphone: 01236 823129

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Posted by: Rob <rob@paperclip.org.uk>
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[Electric Boats] Electric Boat Race and Regatta

 

The Wye Island Electric Boat Marathon will be held at St. Michaels, Md. on Friday, Oct. 6. It is not far from Annapolis Boat Show. It is a race and regatta for electric boats, 24 miles long, leaving from and returning to the Miles River Yacht club. See for details: http://www.electricboats.org/2010-Wye-Island.html Please join us.


Ned Farinholt

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Posted by: nedfarinholt <nedfarinholt@comcast.net>
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[Electric Boats] US Sailing Show Annapolis

 

The US Sailing Show Annapolis will run form October 5 to October 10.  This is the premier sailing  show in North America and again several quality electric propulsion vendors will be attending.  This show is followed by  the US Power Boat Show and I am sure that Hinckley Yachts and Torqeedo will be presenting their new fast powerboat.


Electric propulsion vendorsrepresented at the US Sailing Show will include:

  • Annapolis Hybrid Marine
  • Bell Marine
  • Electric Yacht
  • Fisher Panda
  • Polar Bower
  • Thoosa
  • Torqeedo
  • many Solar, Wind, Hydro, and Diesel generation vendors

There will also be several boat builders at the show who offer electric propulsion options including:

  • Marshall Marine
  • Tartan Yachts
  • S&S
  • General Yachts

Be sure to look us up if you can attend the show.


Mike

Electric Yacht

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Posted by: mike@electricyachtssocal.com
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Friday, September 22, 2017

[Electric Boats] Re: End user price on LiFePO4 cells?

 

Indeed. Some types of lithium batteries actually seem to be getting MORE expensive. Look at brand name 18650 cells, for instance. I think there is a supply/demand issue with raw materials, maybe. OTOH the salvage market is starting to look interesting. I love my $85 Sams Club 220ah golf cart batteries, but I might be taking a hard look at a couple of Tesla packs as more become available for cheap enough to compete with what I am using now. As for new prismatic LiFeP04s, I have stopped holding my breath waiting for the price to drop. I honestly don't think the price is ever going to go down all that much. Certainly not by half or more, which is what it would take to put them on an equal economic footing with flooded cell lead acid batteries.

A lot of modern technology has gotten exponentially cheaper. Computers, for instance. However, the raw material bill for say an IBM PS2 is not much less than for a new I8 powered desktop screamer... only the engineering has had to improve to give us a computer that is literally millions of times more capable for 2/3 the price. Battery prices currently are more dependant on raw materials. There is not much you can do to make a battery cheaper through miniaturization or improved assembly technology.

I think maybe the answer will be a completely new battery chemistry using cheaper and more abundant materials, or maybe revisiting an older discarded technology such as Nickel/Iron. Or possibly capacitors, for short term storage situations where there is daily charging from solar panels. I could be wrong, but the more I think about it, the less hope I have that LiFeP04s are going to save the day. Ever.

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[Electric Boats] Re: End user price on LiFePO4 cells?

 

I hear what you're saying. I wonder if there is a difference between technology price, and product price. What I  mean is, a particular LiFePO4 prismatic cell by a particular manufacturer will have a certain list price in the USA. That price won't change much over the lifetime of the product. But at the same time, cells that are not products, but salvaged from say EVs become available, and are much cheaper per kWh than the cell products, but not so tidy to use i.e. more design required. They are cheaper partly because they are salvage, but also they were designed with a lower cost per kWh for the larger volume EV market.

I built a 4s LiFePO4 pack using CALB SE100 cells. I paid basically list price for one cell, sale price for one cell, and a great clearance price for the other two. This was within one year. Shop around.

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Posted by: cpcanoesailor@yahoo.ca
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Thursday, September 21, 2017

[Electric Boats] End user price on LiFePO4 cells?

 

Over the years, there have been multiple posts in this group about how the cost of Lithium batteries for our conversions will go down over time.  I've been following the prices for 8 years now and haven't observed any reduction in price for LiFePO4 prismatic cells.  Additionally, availability of these cells in the US seems to be getting worse, not better, over time.


What is a fair price today for 1kWh of LiFePo4 prismatic cells, in quantities less than 10 units?  less than 50 units?


I'm just curious.


Fair winds and smooth seas,

Eric Dysart

1964 Cheoy Lee Bemuda 30, 5kW drive, 8kWh LiFePO4 battery

Marina del Rey, CA

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