Tuesday, June 6, 2017

Re: [Electric Boats] Feasible to change to 6v golf cart batteries?

James is right, in a sense.
He is also technically astute, very much.

Nevertheless, huge numbers of lion and forklift batteries around 2-3-4-6
volts are used every day, with no problems, in general.

What james says, basically, is that as battery banks get bigger, they
are more dangerous.
Agree 100% - 200% !!!

Big Batteries, or any major energy source, is always going to be
potentially dangerous.
The good part about lion batteries/packs is that a 0.1 cent electronic
fuse, will stop the problem, almost always.

One of the dangers of a really good/powerful lion battery packs is that
they look harmless.
I used to deal with a 70 kW / 380V from a generator at our facility for
CNC tools.
I was very, very careful with the leads, and all personnel were trained
to treat them as highly dangerous.
Soon, people will learn to respect them.

A small tsla-type battery pack is just as dangerous, gives no warning,
makes no noise.

The battery is NOT dangerous on its own.
Just like guns, jet fighters, are not dangerous.
I used to work on Mig 21bis as a mechanic with major power used to start
the engines, from the ground side auxiliary power unit.



On 06/06/2017 20:23, James Lambden james@electroprop.com [electricboats]
wrote:
> I do not recommend 6 volt batteries. There are twice as many
> batteries in the system, so twice as many interconnections, and much
> more to go wrong with a system like this.
>
> Batteries in parallel have issues too. Hardwiring batteries in
> parallel is problematic. when one battery fails, the other will be
> ruined by the failure. In worst case scenarios, the failed battery
> emits hydrogen gas and the smallest spark can set off a catastrophic
> failure.
>
> Please be careful and monitor every battery on board your boat for
> temperature and voltage and keep your electric boat safe for you and
> your passengers.
>
> The technology exists to have a safe battery bank. Pure Lead 12 volt
> Batteries in series with monitoring. Its really simple, and safe.
>
>
> James
>

--
-hanermo (cnc designs)



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Posted by at No comments:

Re: [Electric Boats] Feasible to change to 6v golf cart batteries?

 

There is no way to monitor a 6 volt battery.


Batteries in series  go out of balance over time.    One of the batteries will go to a very high voltage, and the rest will be low.   The high voltage battery is at risk of gassing off and can experience catastrophic failure.  

Most of the danger comes at the end of the batteries life, but batteries sometimes fail prematurely.    A lead acid battery system should be monitored just like every Lithium system out there.

I do not recommend 6 volt batteries.   There are twice as many batteries in the system, so twice as many interconnections, and much more to go wrong with a system like this.

Batteries in parallel have issues too.   Hardwiring batteries in parallel is problematic.   when one battery fails, the other will be ruined by the failure.   In worst case scenarios, the failed battery emits hydrogen gas and the smallest spark can set off a catastrophic failure.   

Please be careful and monitor every battery on board your boat for temperature and voltage and keep your electric boat safe for you and your passengers.   

The technology exists to have a safe battery bank.   Pure Lead 12 volt  Batteries in series with monitoring.   Its really simple, and safe.    


James   



James Lambden
The Electric Propeller Company
625C East Haley Street,
Santa Barbara, CA
93103

805 455 8444

james@electroprop.com

www.electroprop.com

On Jun 6, 2017, at 7:40 AM, Jeff LaCoursiere jeff@jeff.net [electricboats] wrote:

 


That isn't correct - 12 x 6v in series would be 72v.  The OP was originally correct - 2 sets of 6 x 6v, the two sets in parallel.

I'll throw out a guess that you could then keep your original chargers, and use them in the same manner - just charge each 36v bank just like before.

j

On 06/06/2017 07:33 AM, Daniel Michaels nov32394@yahoo.com [electricboats] wrote:
 

They would all be in a series. One battery charger. Same as a golf cart.


 

I recently bought a 2002 Canadian electric boat Fantail Launch.  It has 36v system, with two groups of three 12v batteries in series, then the two groups linked in parallel.  There are two ProTournament series 3-step marine battery chargers, each dedicated to one of the 3-battery groups.

I fear the current six 12 v Interstate batteries are approaching end of life, and I'm interested in changing over to the 6v golf cart batteries with the higher amp hours capacity.

I need a 36 volt system for the current motor.  So, would I be linking 12 of the 6v batteries: two series of 6 in parallel?  Would I need two more charges to charge the added 6 batteries?

Thanks, and Regards.
M Kirkwood





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Re: [Electric Boats] Re: My new saildrive update or final numbers

 

Thanks Scott and thank you for all your help putting the motor system together. I know I am going to be much happier with the motor I have than the pancake motor I was going to use.


 

Great job Dan! What's amazing is how quickly you pulled it together despite being busy at work. I still can't get over how you can get around at 3 mph using only 10 amps. That's wild! With those group 27 batteries, you can go for a long, long time.

I'm really looking forward to some video. Congrats Dan.

Scott

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Re: [Electric Boats] Feasible to change to 6v golf cart batteries?

 

I was assuming he would only use 6 6v batteries. Golf cart batteries are twice the size of a 12 DCB. Sorry


 


That isn't correct - 12 x 6v in series would be 72v.  The OP was originally correct - 2 sets of 6 x 6v, the two sets in parallel.

I'll throw out a guess that you could then keep your original chargers, and use them in the same manner - just charge each 36v bank just like before.

j

On 06/06/2017 07:33 AM, Daniel Michaels nov32394@yahoo.com [electricboats] wrote:
 

They would all be in a series. One battery charger. Same as a golf cart.


 

I recently bought a 2002 Canadian electric boat Fantail Launch.  It has 36v system, with two groups of three 12v batteries in series, then the two groups linked in parallel.  There are two ProTournament series 3-step marine battery chargers, each dedicated to one of the 3-battery groups.

I fear the current six 12 v Interstate batteries are approaching end of life, and I'm interested in changing over to the 6v golf cart batteries with the higher amp hours capacity.

I need a 36 volt system for the current motor.  So, would I be linking 12 of the 6v batteries: two series of 6 in parallel?  Would I need two more charges to charge the added 6 batteries?

Thanks, and Regards.
M Kirkwood



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Posted by: Daniel Michaels <nov32394@yahoo.com>
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[Electric Boats] Re: Feasible to change to 6v golf cart batteries?

 

Electrically, there is no reason why you can't use golf cart batteries. You may find that 6 of them in ,series is sufficient. Or you could parallel two series strings like the setup you have already. My boat has 8 golf cart batteries in series, as well as a pair in series for 12v service. Golf cart batteries are not suitable for high performance applications, but they are cheap and durable. I am quite satisfied with mine. Keep the electrolyte level where it needs to be, and only add distilled water, and charge them properly and never discharge them below 50% and they will give you your moneys worth.

Before making such a change, make sure they will fit in the space available.

You can use the same multibank 12v charger, just connect each pair of leads to a series pair of 6v batteries. I use a 4 bank 12v charger in similar fashion to charge my 48v bank of golf cart batteries.

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Re: [Electric Boats] Feasible to change to 6v golf cart batteries?

 

Jeff,
Thanks for your response.  The advantage of the parallel configuration obviously is the much larger amp hour capacity.
 Yes, I'd like to keep the same chargers. However, they are currently configured to connect to 3 batteries [12v] each.  What's your thought s on how I would take those same set of 3 charging cables on each charger and connect to the 6 six-volt batteries in the two groups?

MKirkwood

On Tue, Jun 6, 2017 at 9:40 AM, Jeff LaCoursiere jeff@jeff.net [electricboats] <electricboats@yahoogroups.com> wrote:
 


That isn't correct - 12 x 6v in series would be 72v.  The OP was originally correct - 2 sets of 6 x 6v, the two sets in parallel.

I'll throw out a guess that you could then keep your original chargers, and use them in the same manner - just charge each 36v bank just like before.

j

On 06/06/2017 07:33 AM, Daniel Michaels nov32394@yahoo.com [electricboats] wrote:
 

They would all be in a series. One battery charger. Same as a golf cart.


 

I recently bought a 2002 Canadian electric boat Fantail Launch.  It has 36v system, with two groups of three 12v batteries in series, then the two groups linked in parallel.  There are two ProTournament series 3-step marine battery chargers, each dedicated to one of the 3-battery groups.

I fear the current six 12 v Interstate batteries are approaching end of life, and I'm interested in changing over to the 6v golf cart batteries with the higher amp hours capacity.

I need a 36 volt system for the current motor.  So, would I be linking 12 of the 6v batteries: two series of 6 in parallel?  Would I need two more charges to charge the added 6 batteries?

Thanks, and Regards.
M Kirkwood






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consultativeskills@gmail.com
www.InternalConsultativeSkills.com
Consultative Skills education and consulting
Sales Performance Skills training and Coaching
O: 952 472 4043
C: 612 532 7161

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Re: [Electric Boats] Feasible to change to 6v golf cart batteries?

 


That isn't correct - 12 x 6v in series would be 72v.  The OP was originally correct - 2 sets of 6 x 6v, the two sets in parallel.

I'll throw out a guess that you could then keep your original chargers, and use them in the same manner - just charge each 36v bank just like before.

j

On 06/06/2017 07:33 AM, Daniel Michaels nov32394@yahoo.com [electricboats] wrote:
 

They would all be in a series. One battery charger. Same as a golf cart.


 

I recently bought a 2002 Canadian electric boat Fantail Launch.  It has 36v system, with two groups of three 12v batteries in series, then the two groups linked in parallel.  There are two ProTournament series 3-step marine battery chargers, each dedicated to one of the 3-battery groups.

I fear the current six 12 v Interstate batteries are approaching end of life, and I'm interested in changing over to the 6v golf cart batteries with the higher amp hours capacity.

I need a 36 volt system for the current motor.  So, would I be linking 12 of the 6v batteries: two series of 6 in parallel?  Would I need two more charges to charge the added 6 batteries?

Thanks, and Regards.
M Kirkwood



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Posted by: Jeff LaCoursiere <jeff@jeff.net>
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.

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