[PSUBS-MAILIST] Batteries

[via Personal_Submersibles]

Thank you for the in Alan. I am quickly finding that nothing in deep sea vehicles is cheap. haha. Thrusters for $68,000. Tracking system for $53,000. Pressure testing for $26,000. Comms for $29,000. So yup, I'm selling my house and gonna live in a cardboard box, but at least I'll have fun doing it. haha

Thank you,
Scott Waters 

>  -------Original Message-------
>  From: Alan James via Personal_Submersibles <personal_submersibles at psubs.org>
>  To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
>  Subject: Re: [PSUBS-MAILIST] Batteries
>  Sent: Nov 23 '16 14:05
>  
>  Scott,
>  if you do a google image search on lithium iron "internal" or
>  "assembly"
>  or something like that, you find lots of variations. Some are
>  cylinders
>  stacked inside a square container, sometimes stacked vertical,
>  sometimes
>  horizontal; so lots of air pockets. Others are plates.
>  In the case of SWE the battery internals can take massive pressure,
>  but
>  you couldn't guarantee that with every battery on the market. I would
>  assume they could but wouldn't be positive.
>  If I were doing a hack I would get a dead battery of the type I was
>  looking
>  at & cut the top off to see how I would do it. (did that with my AGM
>  battery hack)
>  You could possibly take the tops off the batteries or drill holes in
>  the
>  tops of every cell to let any air escape when you oil filled them.
>  Then
>  put your battery pack in a box with a neoprene diagphram over the top
>  & oil fill.
>  Like Hank is intending to do, or they do with the Deep Sea Power &
>  Light
>  Sea Battery (AGM).
>  My lithium batteries don't have individual cel balancing electronics
>  that I
>  can see. Some have them external to the battery. All I required was a
>  48V
>  battery charger if I was assembling 4 x 12V into a 48V pack.
>  Hugh's batteries were a bit more complex & he had a bad experience
>  through
>  not regularly charging them.
>  Having said all that, when I talked with SWE I believe they were
>  applying
>  for ABS type approval, or something similar. If you are wanting
>  certification
>  you may get knocked back on a lithium battery hack.
>  If it were me I would go & see them & pick their brains. You may find
>  out
>  how to do it yourself, or they may do a good deal for you.
>  I am building my own thrusters to save money, but some times it's
>  cheaper
>  to buy it off the shelf when you cost out your time & the resultant
>  inferior product. :)
>  Cheers Alan
>  
>  -------------------------
>  FROM: via Personal_Submersibles <personal_submersibles at psubs.org>
>  TO: Personal Submersibles General Discussion
>  <personal_submersibles at psubs.org>
>  SENT: Thursday, November 24, 2016 7:19 AM
>  SUBJECT: Re: [PSUBS-MAILIST] Batteries
>  
>  Thank you for that info Alan. I am sure they charge plenty for it
>  being pre-fabed for underwater work. I was hoping to take lithium car
>  batteries and see if there was a way to oil compensate them.
>  
>  Thank you,
>  Scott Waters
>  
>  > -------Original Message-------
>  > From: Alan James via Personal_Submersibles
>  <personal_submersibles at psubs.org>
>  > To: Personal Submersibles General Discussion
>  <personal_submersibles at psubs.org>
>  > Subject: Re: [PSUBS-MAILIST] Batteries
>  > Sent: Nov 23 '16 12:05
>  >
>  > Scott,
>  > these people sell sub sea lithium battery packs. I spoke with them
>  at
>  > the
>  > underwater intervention convention a couple of years back.
>  > They gave me a T shirt :)
>  > Southwest Electronic Energy Group (SWE) | Custom advanced battery
>  > solutions for the oil and gas industry SWE | Southwest Electronic
>  > Energy Group
>  >
>  > SOUTHWEST ELECTRONIC ENERGY GROUP (SWE) | CUSTOM ADVANCED BATTERY
>  > SOLUTIONS...
>  >
>  > Southwest Electronic Energy Group (SWE) designs and builds custom
>  > advanced battery solutions for oil and gas, se...
>  >
>  > -------------------------
>  > FROM: via Personal_Submersibles <personal_submersibles at psubs.org>
>  > TO: PSUBS <personal_submersibles at psubs.org>
>  > SENT: Thursday, November 24, 2016 6:46 AM
>  > SUBJECT: [PSUBS-MAILIST] Batteries
>  >
>  > Does anyone on psubs have experience in oil compensating lithium
>  > batteries? The only time I have known this to happen is in James
>  > Cameron's deep sea challenger. I have tried to get answers from
>  their
>  > engineering staff, but have had no luck so far.
>  >
>  > Thank you,
>  > Scott Waters
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