Saturday, May 26, 2018

[Electric Boats] Re: Shunt size

 

No the shunt is probably not the problem. 100 amp ,100 mv means that there is a 100 mv drop at 100 amps. 

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Posted by: Brian Hall <mainfuse@gmail.com>
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Friday, May 25, 2018

[Electric Boats] my version of the African Queen total solar boat [2 Attachments]

 
[Attachment(s) from brucenoble@bellsouth.net [electricboats] included below]

Before and After pics

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2 of 2 Photo(s)

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[Electric Boats] Shunt size

 

I have a 100 amp 100mv shunt for my 5kw 48 volt system. I use it to feed a Cycle Analyst. At times I pull low to mid 100 amps (120-150amps). My Sevcon Millipak isn't happy when I use these higher amp loads. Could an undersized shunt cause issues?

Sent from my iPhone

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Posted by: Mark Frasca <acsarfkram@yahoo.com>
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[Electric Boats] Charging Questions

 

I have some T105 batteries (6V, 230AH) I need to charge.  I have a Shcumacher SC-8020 charger that I have trusted and used in the past.  


Is it OK for me to join two T105's in series and charge them as one 12v battery using a standard charger?


Would it be OK for me to take two banks of series connected T105's and connect the banks in parallel to get 12V and use my standard charger?


Is charging banks of T105's any different than charging a "normal" battery?



Chris Curtis



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Posted by: yahoomail@curtisteam.org
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[Electric Boats] Re: Basic help with sizing

 

Thanks for your advice.  I picked up 4 X T105's today.  Initially I plan to use my trolling motor because I have it.  I modified it to create a remote head.   I'll need to create a tiller horn so I can steer.   I'll use the 4 batteries as a 12v pack and do some testing.  There is a small boat event close by next month called the howl at the moon cruise.  Its on Priest Lake in the Idaho Panhandle.  It will be a good place to test as I'll have a willing tow boat if needed.


If anyone is interested the boat is a converted sailboat.  A one of a kind prototype from a famous small boat designer.  For me, I already have a smaller version of a design by this person (Matt Layden, of Paradox fame) and there were things I did not like about the design as a sailboat.  One day while I was dreaming about boat designs I came on a Phil Bolger design called the Delaware Trawler and realized my e460 looked a small version of the boat.  Knowing I'd always chose my Paradox over the 460, I decided the boat would better serve me as a trawler when the weather was not ideal for sailing.  The builders website is still up if anyone wants to take a look.


I'll post later next month after I spend a long weekend testing the motor and its endurance.




Chris Curtis



---In electricboats@yahoogroups.com, <cpcanoesailor@...> wrote :

Hull speed for your boat is about 5.3 knots, so 4 knots is about 75% of that. I don't think a 50lb trolling motor will give the performance you want. If you change the prop, you could make it more efficient and get closer to your desired speed. A 100lb thrust motor would probably be appropriate.

One rule of thumb is 1A for each pound of thrust at 12V. I'd suggest going with a higher voltage system, like 24V or even 48V, since that will divide the current draw by 2 or 4, so you don't need to use really thick wires and the associated connections. Also, your Peukert losses will be divided as well, so less wasted energy.

It sounds like you want to use your batteries as ballast, which works in your favour. So you can use reasonably priced heavy batteries i.e. lead-acid.

Power required vs. speed is quite exponential, meaning it takes very little energy to make the boat start moving, but each increase in speed (say 1/2 knot) takes more and more energy than the last increase. So if you want to go 4 knots, and you're operating at 75% of hull speed, the last knot to get there will require a fair bit of power. I've seen graphs of power vs displacement speed on this forum.

Let us know how you progress with your plans.

 

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Wednesday, May 23, 2018

Re: [Electric Boats] Compac 23 electric conversion (parting with)

 

Good question: Copied and recommended at https://www.facebook.com/groups/549111295238164/
ᐧ

Cheers,

Rob Kay
Mobile: 0792 2692493
Landline and ansaphone: 01236 823129

On 23 May 2018 at 19:38, millsy321@yahoo.com [electricboats] <electricboats@yahoogroups.com> wrote:
 

Hello Group,


I purchased a new (to me) larger boat and am selling my Compac 23 sailboat, which is located in NW Florida.  


This is a unique boat in that I replaced the original concrete ballast in the keel cavity with a combination of lead and (8) grp 31 AGM batteries set up into two banks of 24V.  The original work was done in 2007, and I replaced the batteries in 2011, running a Torqeedo Cruise 2 outboard for about 12 hours (at 2.6 Knots) continuously if needed.  The Torqeedo quit right after the 3-year warranty expired (don't get me started on this) and I since have reverted back to the original gas engine.


The electrical system includes a 24V charger, e-meter, DC-DC converter with seperate 12V AGM battery.  Everthing is per current ABYC with respect to overcurrent protection, conductor size, etc (I am a marine surveyor).  One of the 24V battery banks has been disabled as it will not hold a charge and all batteries are now going on 7 years so it is probably time to consider replacement (last time I used AGM batteries from an elevator company).


The interior is fitted out with a new grid strucure including bulkheads and other joinery with mahogany staving and trim, new cushions, new head, LED lighting, sliding icebox, and other features.  I also increased the hull shell thickness in the keel area tapering off into the tun of the bilge and glassed the inside of the hull/deck joint.  I added the factory bowsprit.  Hull and decks are spray-applied Awlgrip.  New loose-footed mainsail.


I am asking $10,000.00, including trailer.  I think that this would be a good fit and unique oppurtunity for someone interested in electric boats, and would be happy to send interested persons a Dropbox link with  photos.


Thanks & regards,

Chris




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Posted by: Rob <rob@paperclip.org.uk>
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[Electric Boats] Compac 23 electric conversion (parting with)

 

Hello Group,


I purchased a new (to me) larger boat and am selling my Compac 23 sailboat, which is located in NW Florida.  


This is a unique boat in that I replaced the original concrete ballast in the keel cavity with a combination of lead and (8) grp 31 AGM batteries set up into two banks of 24V.  The original work was done in 2007, and I replaced the batteries in 2011, running a Torqeedo Cruise 2 outboard for about 12 hours (at 2.6 Knots) continuously if needed.  The Torqeedo quit right after the 3-year warranty expired (don't get me started on this) and I since have reverted back to the original gas engine.


The electrical system includes a 24V charger, e-meter, DC-DC converter with seperate 12V AGM battery.  Everthing is per current ABYC with respect to overcurrent protection, conductor size, etc (I am a marine surveyor).  One of the 24V battery banks has been disabled as it will not hold a charge and all batteries are now going on 7 years so it is probably time to consider replacement (last time I used AGM batteries from an elevator company).


The interior is fitted out with a new grid strucure including bulkheads and other joinery with mahogany staving and trim, new cushions, new head, LED lighting, sliding icebox, and other features.  I also increased the hull shell thickness in the keel area tapering off into the tun of the bilge and glassed the inside of the hull/deck joint.  I added the factory bowsprit.  Hull and decks are spray-applied Awlgrip.  New loose-footed mainsail.


I am asking $10,000.00, including trailer.  I think that this would be a good fit and unique oppurtunity for someone interested in electric boats, and would be happy to send interested persons a Dropbox link with  photos.


Thanks & regards,

Chris



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Posted by: millsy321@yahoo.com
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