[PSUBS-MAILIST] batteries

[Rick Patton via Personal_Submersibles]

Alan
Yes there are 2 separate pods each containing 4 each 12v batteries , 3 for
the 36v for thrusters & 1 for the onboard systems.
DAN H built his per plans and specs and is running his stern thruster off
one side & and sides off the other side but he is not running Minn-Kotas.
I am hopping James Franklin will chime in as he is using the Minn-Kotas in
his.
Rick

On Sun, Oct 29, 2017 at 8:13 PM Alan via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Rick,
> I am not familiar with the k350 battery set up, but are there two
> battery pods with 3 x 12V batteries in each pod?
> What are the other k350 owners doing? Do they run the 3 thrusters
> off the 2 battery pods similtaneously i.e. connect both pods in parallel.
> If you did this then you would only be drawing half the amps off each
> battery pod, than you would be if you were using one.
> I wonder what traction batteries mobility scooters use?
> Cheers Alan
>
>
>
>
>
> Sent from my iPad
>
> > On 29/10/2017, at 9:27 AM, Rick Patton via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
> >
> > I am trying to size my wire for the 36v side from where the power comes
> into the sub to selector switch to hot buss bar and was wondering if that
> was something that someone could answer. Also I was told by Minn-Kota that
> they recommend group 27 marine batteries.
> > I have a couple of deep cycle (marine batteries) on my boat and they are
> 550 cca and 125 amps reserve capacity.
> > My plan is to run all three Minn-kota thrusters off of one side at a
> time and their max draw is 46 amps max so there is 138 amps if all three
> thrusters are wide open. I doubt I would ever have all three maxed for more
> than short spurts but want to be repaired for the worst case scenario like
> if I am bucking a strong current.
> > I also will be running 6 outside LED lights off the same bank and though
> I can dim them and selectively use them, all on at max would be about a
> 16.6 amp draw as well. Now most of the time I will be using the thrusters
> at minimal draw and not all 3 at the same time and the 6 lights will
> probably never all be on at the same time.
> > If everything was wide open, I would be pulling about 155 amps from a
> bank that has a reserve capacity of 125 so it would deplete the bank rather
> fast and may even damage the batteries due to a quick drain? So,,, first
> question...would 2 OTT wire be sufficient from battery source to bus bar as
> long as I am not running full tilt on everythig and second... since I have
> to stick with a lead acid system due to design, can I get a group 27
> battery that can deliver much more than the 125 amps I have on my boat?
> > I also have the option of putting the battery selector switch on both
> banks if I have to but would rather deplete one bank at a time if can.
> > Comments appreciated.
> > Rick
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