[PSUBS-MAILIST] batteries

[RICK Patton via Personal_Submersibles]

Brian,

Yes I’ll have three 12V batteries per bank.  I’ll have to check with a battery manufacturer to see what the biggest reserve amp hour battery that is made in a lead acid. I guess I might have to run in the “both” position if I can’t find a lead acid that will go much higher. 
Rick



Sent from Mail for Windows 10

From: Brian Cox via Personal_Submersibles
Sent: Saturday, October 28, 2017 1:01 PM
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] batteries

Rick,    Are you running 3 - 12volt  batteries for each bank ?   The amp hour calculation is pretty straight forward , sounds like you would have less than one hour of juice running everything full on.
 
Brian

--- personal_submersibles at psubs.org wrote:

From: Rick Patton via Personal_Submersibles <personal_submersibles at psubs.org>
To: psubs chat room <personal_submersibles at psubs.org>
Subject: [PSUBS-MAILIST] batteries
Date: Sat, 28 Oct 2017 10:27:36 -1000
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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