Wednesday, June 6, 2018

Re: [Electric Boats] Project lagoon 410

 

Hi Pascal:
Here's another great resource on Facebook with over 2,000 members: please drop in and join us!
https://www.facebook.com/groups/549111295238164/

Cheers,

Rob Kay
Secretary, Electric Boat Association

On 6 June 2018 at 02:22, squalmail@gmail.com [electricboats] <electricboats@yahoogroups.com> wrote:
 

Hello


I would to change my olds yanmar 3GM30 (27hp) on my catamaran lagoon 410 (1998) by electric solution.

Who can help me to find the best and inexpensive solution, please.

Best regards

Pascal Morin
Guadeloupe


ᐧ

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Tuesday, June 5, 2018

[Electric Boats] Project lagoon 410

 

Hello


I would to change my olds yanmar 3GM30 (27hp) on my catamaran lagoon 410 (1998) by electric solution.

Who can help me to find the best and inexpensive solution, please.

Best regards

Pascal Morin
Guadeloupe

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Sunday, May 27, 2018

[Electric Boats] Re: Shunt size

 

The shunt reducing the available voltage by 150mv or so should be insignificant.  But it would be worthwhile to check the shunt for heating which could mean a poor connection.  Shunts are generally large masses of brass/copper and be able to allow a large current without significant heating.  The 100A/100mV shunt has a resistance of 1milli-ohm and at 150A will produce 22.5W of heat which it has to dissipate.  Compare that to the motor at 150A/48V = 7.2KW. 

I think you said you have a 5KW system.  Maybe 7.2KW has something to do with the Sevcon overheating?  I don't know how well it does, but may be the problem.  How about the motor??

John

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[Electric Boats] Re: Shunt size

 

Hi John,


The Cycle Analyst is fine. The Sevcon Millipak gives 8 flashes which is an overheat fault I believe. It will motor around at 33 amps all day but to get more power I have to let it sit with no or very low amp draw for a minute or two before I can get more amp draw. Then that lasts a very short time. I'm wondering if the undersized shunt might be "choking" the system. 

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[Electric Boats] Re: Shunt size

 

150A through the 100A shunt is 150mv.  If your Cycle Analyst is expecting 100mv full scale it may not like that or minimally give undetermined readings.

Doesn't your Sevcon say why it is unhappy?

John

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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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Friday, May 25, 2018

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

 
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Before and After pics

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