[PSUBS-MAILIST] (no subject)

[Alan via Personal_Submersibles]

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 for Windows 10
>> 
>>  
>> 
>> From: hank pronk via Personal_Submersibles
>> Sent: Sunday, October 29, 2017 12:29 PM
>> To: Personal Submersibles General Discussion
>> 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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