[PSUBS-MAILIST] (no subject)

[Rick Patton via Personal_Submersibles]

Thanks Alan
Looks like I will have to run my 36v needs in the "Both " position drawing
off of both sides at once so I can achieve my needs without harming the
batteries.
Rick

On Mon, Oct 30, 2017 at 5:58 AM Alan via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Rick,
> for the given space that you have you are not going to get any more
> amp hours. I.e. if you have a 12V 50ah battery, a 12V 100ah battery is
> liable to be twice the volume. I would be looking at what was the biggest
> size traction battery I could fit in the available space..
> You could wire up your "house battery" in parallel with your other 3
> batteries
> in the pod to give extra amp hours, then use a buck converter off your 36V
> to give 12V for house supply. You may be able to find 3 batteries that fit
> the space you have for 4.
> Be careful of the amp hour rating. Most batteries are rated on a discharge
> over a 20hr period whereas we have a higher rate of discharge, & this
> drops
> the amp hour rating dramatically. And then the more you discharge the
> batteries
> the quicker you destroy them, I think 50% is the maximum recommended
> discharge.  So your 100Ahr  battery may be 30Ahr (guessing) I am emailing
> half
> asleep so check my facts.
> I have  agm batteries & they have slightly less capacity than normal lead
> acid
> batteries, but don't spill or give off as much gas.
> Of course there are lithium iron batteries!
> Cheers Alan
>
>
> Sent from my iPad
>
> On 31/10/2017, at 3:32 AM, Rick Patton via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Hank
> My thrusters are 36v with a 46 amp max draw. From my limited understanding
> of batteries, I thought that tying 3 each 12v 100 amp batteries together
> gave you the 36 volts but you still only had 100 amps.?not 300 amps?  So I
> am after a 12 v battery with the most reserve amps I can find.
> Rick
>
> On Mon, Oct 30, 2017 at 1:07 AM hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> Rick,
>> I thought your goal was to find a group 27 battery that can handle the
>> discharge rate, more than amp hr rating.   I agree they are expensive, and
>> I wonder if they are as robust as a good old fashion lead acid.  I would
>> not get to hung up on amp hrs, If you have 6 12v batteries at 100ah, I
>> think that is plenty of juice.  Gamma has 900ah at 12v and I have never run
>> out of juice.  I need the 900ah because of my long surface transits.   If
>> you are towing your sub to the dive site, 600ah will be plenty for
>> recreational diving.   The type of dive you do will make the difference.
>> If you are diving on a wreck site, your power consumption will be very low
>> if you have the sub well ballasted.  If you have the sub trimmed perfectly,
>> your vertical thrusters will work very little to move you around.   Your
>> right about your motors, they will not be working hard often.
>> Maybe other K350 owners can comment on how their  batteries stand up.  I
>> am comparing to Gamma witch has less thrust power than K350 with 3 101's
>> Hank
>>
>> On Sunday, October 29, 2017, 11:12:08 PM MDT, RICK Patton via
>> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>
>>
>> Hank,
>>
>> Link came threw. I looked a number of 12v batteries for golf carts but
>> they all seemed to be no more than 100 amps and much more costly than the
>> 125 amp lead acid ones that I have. Was there a different reason that you
>> recommended them?
>>
>> Rick
>>
>>
>>
>> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for
>> Windows 10
>>
>>
>>
>> *From: *hank pronk via Personal_Submersibles
>> <personal_submersibles at psubs.org>
>> *Sent: *Sunday, October 29, 2017 12:29 PM
>> *To: *Personal Submersibles General Discussion
>> <personal_submersibles at psubs.org>
>> *Subject: *[PSUBS-MAILIST] (no subject)
>>
>>
>>
>> Hi Rick
>>
>> Here is one of the 12v golf cart battery options on eBay.  Lots to chose
>> from, I have had good luck with the 6v version of this battery.
>>
>> Hank
>>
>>
>>
>> ----- Forwarded Message -----
>>
>> *From:* xxx xxxxx <mp13 at live.ca>
>>
>> *To:* hanker_20032000 at yahoo.ca <hanker_20032000 at yahoo.ca>
>>
>> *Sent:* Sunday, October 29, 2017, 4:21:42 PM MDT
>>
>> *Subject:*
>>
>>
>>
>> VMAX MB127 12V 100Ah Golfcart AGM Deep Cycle Group 27 SLA Battery
>>
>>
>>
>>
>> https://www.ebay.com/itm/VMAX-MB127-12V-100Ah-Golfcart-AGM-Deep-Cycle-Group-27-SLA-Battery/271121536888?hash=item3f201a5778:g:WG0AAOSwVctY5TrT
>>
>>
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