[PSUBS-MAILIST] Lithium batteries

Thu Feb 5 12:22:11 EST 2015

If the batteries are in series you cannot multiply the discharge rate by the number of batteries since in series the current is the same for each battery.

Assuming I understand what you are saying.

Ken Martindale

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Alan James via Personal_Submersibles
Sent: Tuesday, February 03, 2015 8:27 PM
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] Lithium batteries

Should add that if the batteries are connected in series

you can x the discharge rate by the number of batteries.

Also on the lithium batteries the max peak discharge rate

is double the continuous rating.

The Thundersky lifepo4 batteries I think are 3c, so the 

500Ahr battery needed for your 8hr run time would have

a continuous rating of 1500 amps & double that peak rate.

Not that your wiring could take that.

Confirm this before you buy. I think I am right!:)

Alan

  _____  

From: Alan James via Personal_Submersibles <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> >
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> > 
Sent: Wednesday, February 4, 2015 8:30 AM
Subject: Re: [PSUBS-MAILIST] Lithium batteries

Hi David,

firstly here's a link to an article on electric vehicle battery prices.

 <http://evsroll.com/Electric_Car_Battery_Cost.html> http://evsroll.com/Electric_Car_Battery_Cost.html

Manual Thundersky Batteries

http://www.thunderstruck-ev.com/Manuals/Thundersky%20Product%20Manual.pdf

I am looking at 48V for my sub, but that won't be confirmed

till I have made a successful thruster. I won't need my batteries

for a couple of years & are hanging out for the new technology

lithium sulphur batteries.

Hugh Fulton has a bit of experience with lithium iron batteries

if he should chime in.

Most of the Winston (thundersky) batteries I have seen have a 

maximum discharge of 100 amps and have a continuous draw 

of 50 amps. I have seen traction lifepo4 batteries advertised by

other companies. They may have higher max discharge rates.

The battery amp hour rating is based on discharging over 20 hrs

& you have a maximum depth of discharge of 80%, so at a guess

around 500 amp/hr.

Alan

  _____  

From: Seaquestor via Personal_Submersibles <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> >
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> > 
Sent: Wednesday, February 4, 2015 3:49 AM
Subject: Re: [PSUBS-MAILIST] Lithium batteries

Hi Alan, what voltage value are you us r in to build your array? I think I would would need 10 -12 batteries to achieve the 36 volts. Potential max thruster amp draw, 190a - 240a. , average draw 40a. Needed run time 8 hrs. What battery would you use?

David

Sent from my Verizon Wireless 4G LTE smartphone

-------- Original message --------
From: Alan James via Personal_Submersibles <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> > 
Date: 02/03/2015 1:29 AM (GMT-08:00) 
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> > 
Subject: Re: [PSUBS-MAILIST] Lithium batteries 

Tired, forgot to post the link.

http://alliancerenewableenergy.com/Thunder-Sky-LiFeYPO4-Batteries_c3.htm

  Scott, I presume you are talking about keeping the weight down "under the water,"

in which case if you went with battery pods instead of compensating, there wouldn't 

be much difference, as you are putting square batteries in to round

battery pods & there would be a lot of air space that would counter the weight of the pod.

Alan

  _____  

From: Alan James via Personal_Submersibles <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> >
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> > 
Sent: Tuesday, February 3, 2015 10:15 PM
Subject: Re: [PSUBS-MAILIST] Lithium batteries

WOW that's expensive.

These Thundersky batteries are a good option.

I remember Herve Jaubert saying he was using them in his ambient's,

but in a battery pod, not compensated.

Alan

  _____  

From: David Colombo via Personal_Submersibles <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> >
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> > 
Sent: Tuesday, February 3, 2015 9:34 PM
Subject: Re: [PSUBS-MAILIST] Lithium batteries

Hi Scott,

Two years ago the cost was $7000 for a single battery when I attended the UI convention. They might be cheaper this year. Want me to pick you up  a couple, I know they are supposed to be at the the Ui event this year as well. Wy and I will be attending. I will need a bigger suit case to bring them home however.

Best Regards,
David Colombo

804 College Ave
Santa Rosa, CA. 95404
(707) 536-1424
www.SeaQuestor.com <http://www.seaquestor.com/> 

On Mon, Feb 2, 2015 at 6:04 PM, swaters at waters-ks.com <mailto:swaters at waters-ks.com>  via Personal_Submersibles <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> > wrote:

Thanks for the info Alan!

-Scott Waters

Sent from my U.S. Cellular® Smartphone

-------- Original message --------
From: Alan James via Personal_Submersibles <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> > 

Date:02/02/2015 12:32 PM (GMT-06:00) 
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> > 
Cc: 
Subject: Re: [PSUBS-MAILIST] Lithium batteries 

Iam not sure about that battery Scott,

but these are pressure resistant & have a compensation module.

 <http://www.swe.com/seasafe-subsea-modules/> SWE Seasafe subsea Battery Modules SWE | Southwest Electronic Energy Group

 <http://www.swe.com/seasafe-subsea-modules/> 

 <http://www.swe.com/seasafe-subsea-modules/>  

 <http://www.swe.com/seasafe-subsea-modules/>  

 <http://www.swe.com/seasafe-subsea-modules/>  

 <http://www.swe.com/seasafe-subsea-modules/>  

 <http://www.swe.com/seasafe-subsea-modules/> 
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