[PSUBS-MAILIST] Lithium batteries

Tue Feb 3 20:26:51 EST 2015

Should add that if the batteries are connected in seriesyou can x the discharge rate by the number of batteries.Also on the lithium batteries the max peak discharge rateis double the continuous rating.The Thundersky lifepo4 batteries I think are 3c, so the 500Ahr battery needed for your 8hr run time would havea 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>
 To: Personal Submersibles General Discussion <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
Manual Thundersky Batterieshttp://www.thunderstruck-ev.com/Manuals/Thundersky%20Product%20Manual.pdf
I am looking at 48V for my sub, but that won't be confirmedtill I have made a successful thruster. I won't need my batteriesfor a couple of years & are hanging out for the new technologylithium sulphur batteries.Hugh Fulton has a bit of experience with lithium iron batteriesif 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 byother 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 guessaround 500 amp/hr.Alan

   From: Seaquestor via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <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> 
Date: 02/03/2015 1:29 AM (GMT-08:00) 
To: Personal Submersibles General Discussion <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 roundbattery 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>
 To: Personal Submersibles General Discussion <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>
 To: Personal Submersibles General Discussion <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

On Mon, Feb 2, 2015 at 6:04 PM, swaters at waters-ks.com via Personal_Submersibles <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> 
Date:02/02/2015 12:32 PM (GMT-06:00) 
To: Personal Submersibles General Discussion <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.SWE Seasafe subsea Battery Modules SWE | Southwest Electronic Energy Group

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