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Wiring batteries in parallel?

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Deems Davis

Joined: 09 Jan 2006
Posts: 925

Posted: Mon Jul 17, 2006 8:07 pm Post subject: Wiring batteries in parallel?

When  I built my battery tray, I was anticipating a dual battery (Z14) 

architecture. I'm now convinced that a z13 would be a better match. I'm 

having trouble finding a single battery that will fit my tray footprint 

(7.3"x6.2") I built the tray for 2 Odessey PC680's (at) 17ah ea. Can I wire 

the 2 batteries together in parallel and treat them (architecturally) as 

a single battery w/ 34 ah capacity? Are there any special considerations 

for the wiring  (I assume #2 welders cable)?



THANKS

(all this electrical stuff is voodoo to me)



Deems Davis # 406

Fuse

http://deemsrv10.com/

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TimRhod(at)aol.com
Guest

Posted: Mon Jul 17, 2006 8:24 pm Post subject: Wiring batteries in parallel?

Deems;        IN Z-14 when you crossfeed the  systems that is precisly what you are doing. Combining two 17 amp to make one 34  amp battery.

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nuckollsr(at)cox.net
Guest

Posted: Mon Jul 17, 2006 8:35 pm Post subject: Wiring batteries in parallel?

At 09:01 PM 7/17/2006 -0700, you wrote:



 	  Quote: 	
		  



When  I built my battery tray, I was anticipating a dual battery (Z14) 

architecture. I'm now convinced that a z13 would be a better match. I'm 

having trouble finding a single battery that will fit my tray footprint 

(7.3"x6.2") I built the tray for 2 Odessey PC680's (at) 17ah ea. Can I wire 

the 2 batteries together in parallel and treat them (architecturally) as a 

single battery w/ 34 ah capacity?


	


  Yes, but why so much battery? You could stick a block of styrofoam

  in to take up the space and use the recovered 13# for baggage or

  passengers.



 	  Quote: 	
		    Are there any special considerations for the wiring  (I assume #2 

 welders cable)?


	


  #4 is fine for battery jumpers. #2 is considered for bringing

  widely separated battery and engine together . . . but if both

  are up-front, #4 suffices for all fat wires.

 	  Quote: 	
		  THANKS

(all this electrical stuff is voodoo to me)


	


  Hang around here and we'll attempt to make it less

  mystifying.





        Bob . . .

      ---------------------------------------------------------

      < What is so wonderful about scientific truth...is that >

      < the authority which determines whether there can be   >

      < debate or not does not reside in some fraternity of   >

      < scientists; nor is it divine. The authority rests     >

      < with experiment.                                      >

      <                            --Lawrence M. Krauss       >

      ---------------------------------------------------------

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nuckollsr(at)cox.net
Guest

Posted: Tue Jul 18, 2006 5:54 am Post subject: Wiring batteries in parallel?

At 12:19 AM 7/18/2006 -0400, you wrote:



 	  Quote: 	
		  Deems;        IN Z-14 when you crossfeed the systems that is precisly what 

you are doing. Combining two 17 amp to make one 34 amp battery.


	




  That, and some other things.



  One may close the cross-feed contactor during cranking to achieve

  the effect of a "stronger" battery irrespective of what size

  batteries are used. The only caveat is that the batteries should

  individually be capable of delivering engine cranking currents.

  E.g., you wouldn't want to cross-feed a 17 ah battery with a 7 ah

  battery for starting.



  Otherwise, the cross-feed contactor is left open for all normal

  ops and closed only when it makes sense to share the capabilities

  of a working system to offset the failed capability in the other

  system.



  One can run dual or triple or even quad batteries in any

  of the z-figures if design goals show that the capability

  is useful and offsets some potentially catastrophic hazard.

  It's very rare that more than two batteries will be needed.

  Z-30 shows how additional batteries may be added over and

  above existing batteries to provide another always-hot bus

  for some task.



        Bob . . .



      ---------------------------------------------------------

      < What is so wonderful about scientific truth...is that >

      < the authority which determines whether there can be   >

      < debate or not does not reside in some fraternity of   >

      < scientists; nor is it divine. The authority rests     >

      < with experiment.                                      >

      <                            --Lawrence M. Krauss       >

      ---------------------------------------------------------

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brian

Joined: 02 Jan 2006
Posts: 643
Location: Sacramento, California, USA

Posted: Tue Jul 18, 2006 7:17 am Post subject: Wiring batteries in parallel?

On Jul 18, 2006, at 9:45 AM, Robert L. Nuckolls, III wrote:

 	  Quote: 	
		  

  One may close the cross-feed contactor during cranking to achieve

  the effect of a "stronger" battery irrespective of what size

  batteries are used. The only caveat is that the batteries should

  individually be capable of delivering engine cranking currents.

  E.g., you wouldn't want to cross-feed a 17 ah battery with a 7 ah

  battery for starting.


	


Uh, why not? If the two batteries are of the same type they will  

deliver current proportional to their capacity. Even tying an almost  

depleted battery with an almost full battery will increase the  

available starting current. The only thing I don't think you would  

want to do is tie a gel-cell together with an AGM but for starting  

even that would probably be OK. (It would definitely not be OK for  

charging tho'.)



Brian Lloyd                         361 Catterline Way

brian-yak AT lloyd DOT com          Folsom, CA 95630

+1.916.367.2131 (voice)             +1.270.912.0788 (fax)



I fly because it releases my mind from the tyranny of petty things . . .

— Antoine de Saint-Exupéry

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_________________
Brian Lloyd
brian-yak at lloyd dot com
+1.916.367.2131 (voice) +1.270.912.0788 (fax)

I fly because it releases my mind from the tyranny of petty things . . .
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