[PSUBS-MAILIST] battery compensation

Mon Nov 14 16:36:39 EST 2016

Alan,Yes I know, the battery is around  70 lbs and the volume is around 30 lbs or 3 imp gallons.  So I take the volume of water off the original weight of the battery.  ;-)  The battery box will be plastic and that is almost neutral and the oil is buoyant.Hank 

    On Monday, November 14, 2016 1:23 PM, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

  Hank,Just checking but that seems a lot! You are only gaining in flotation the volume of the battery,not it's weight. Alan

      From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Tuesday, November 15, 2016 1:09 AM
 Subject: Re: [PSUBS-MAILIST] battery compensation

Alan,I am trying to reduce the submerged weight of the sub, by moving the batteries outside, I can reduce the weight of the sub by approximately 30 lb per battery.  With four batteries, that is 120 lbs of weight I shave off.  That is significant to me-that means I can instal a 120 lb manipulator package without adding buoyancy.A battery pod is a lot of work to build and would be quite heavy for a 3000 foot rating.  Hank  

    On Sunday, November 13, 2016 7:57 PM, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Hank,just did a quick calculation on a 12V 104 AH battery that is 350 L x 167 W x 179 H.It's volume is 10.4 liters The volume of a cylinder (battery pod) to enclose it would be16.5 liters. However you would need a box that covers the battery terminal height, whichwould increase the cubical battery housing volume to 13.4 liters.So you will be 2.1kg (4.62 pounds) heavier dry weight per 104 AH battery with a pod rather than a compensated box. This is rough, there are other factors like the hemisphericalends of the battery pods & material thickness.Cheers Alan

      From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Monday, November 14, 2016 10:10 AM
 Subject: Re: [PSUBS-MAILIST] battery compensation

"Hold on a year,",, are not words I use ;-)  I will be onto my next sub by then lol.  I have to get Elementary done this winter so I can get onto my next project.Hank 

    On Sunday, November 13, 2016 1:43 PM, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Hank,hold on another year, help is on it's way!Here is a lithium Sulphur battery they have trialed, that goes to 6km deep.http://www.power-eetimes.com/news/high-performance-lithium-sulphur-batteries-deep-dive-underwater-vehicles-move-step-closerThe problem they are having with developing Lithium Sulphur batteries for the automobile market,is the number of charge cycles they can get out of them; however we don't take oursubmarines out every day, & the number of charge cycles is probably acceptablefor a submersible application.I have read that the price in the future will be cheaper per kilowatt than a lead acid battery.Alan

      From: Alan James via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Monday, November 14, 2016 8:26 AM
 Subject: Re: [PSUBS-MAILIST] battery compensation

Hank,if you tried to seal each battery individually, you would still have tolink the batteries in series. So this would mean sealing the 2 wirescoming out of each battery & sealing where they connect. That isif I am understanding what you want to do correctly.There is "Deep Sea Power & light's" Sea battery, that we have mentioned before, but this is a sealed lead acid battery.The busby book has a section on battery compensating.There are a lot of problems for not much benefit.Alan

      From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Monday, November 14, 2016 2:01 AM
 Subject: [PSUBS-MAILIST] battery compensation

Hi guys,I would like to switch Elementary from internal batteries to external batteries and flood them with oil.  Has anyone tried to make a cap for the top of a battery with a rubber top to hold in oil.  So instead of building a box around the battery, simply encapsulate the openings of the battery body.  Again this is in an effort to keep the sub light.Hank
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