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Dual Battery/Alternator Question

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tgesele(at)optonline.net
Guest

Posted: Tue Aug 15, 2006 5:36 am Post subject: Dual Battery/Alternator Question

I'm planning a dual battery/dual alternator electrical system for my

all-electric day/night IFR RV-10 behind an IO-540 and was hoping someone

could help with my battery selection.



I'll be installing the B&C 40 amp  & 20 amp alternators and was considering

the following battery options:



1) Dual Odyssey 680.

2) Dual B&C 12 AH.

3) Single Odyssey 680 + B&C 7AH

4) Dual Odyssey 545



My only reason for not going with the dual odyssey 680 solution is the

weight penalty - I'm very concerned that the -10 will be heavy and want to

do anything reasonable to save weight. However, I don't want to compromise

on system reliability/safety since I'll be traveling with my entire family.



Thanks in advance for any insights into the selection and, if there are

other alternatives that I should be considering, please let me know.



- Tom Gesele

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aadamson(at)highrf.com
Guest

Posted: Tue Aug 15, 2006 6:23 am Post subject: Dual Battery/Alternator Question

Probably the first thing you need to do it figure out the rest of your

avionics.  Then your "no alternator - battery only" current needs and

emergency profiles.  Then you'll know better what you need out of a battery.

Cranking amps is only 1/10 of the equation, altho used all the time ...

 

Alan



Ps. There are a number of guys on this list that have RV10's and similar

setups, hopefully one will chime in with their specifics.  For a starting

point go look at Tim Olson's - www.myrv10.com

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nuckollsr(at)cox.net
Guest

Posted: Tue Aug 15, 2006 6:35 am Post subject: Dual Battery/Alternator Question

At 09:34 AM 8/15/2006 -0400, you wrote:



 	  Quote: 	
		  



I'm planning a dual battery/dual alternator electrical system for my

all-electric day/night IFR RV-10 behind an IO-540 and was hoping someone

could help with my battery selection.



I'll be installing the B&C 40 amp  & 20 amp alternators and was considering

the following battery options:



1) Dual Odyssey 680.

2) Dual B&C 12 AH.

3) Single Odyssey 680 + B&C 7AH

4) Dual Odyssey 545



My only reason for not going with the dual odyssey 680 solution is the

weight penalty - I'm very concerned that the -10 will be heavy and want to

do anything reasonable to save weight. However, I don't want to compromise

on system reliability/safety since I'll be traveling with my entire family.



Thanks in advance for any insights into the selection and, if there are

other alternatives that I should be considering, please let me know.


	


   I presume you're talking about Z-14. This system would function

   nicely on two light batteries . . . but they tend to be expensive

   due to low-volumes of production.



   Have you considered Z-13/8? What are your alternator-out system loads?

   Z-13/8 with one 17 a.h. battery gives you a total hardware weight on

   the order of 25 pounds. What's driving you toward a dual battery

   installation?



   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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jschroeder(at)perigee.net
Guest

Posted: Tue Aug 15, 2006 8:16 am Post subject: Dual Battery/Alternator Question

Tom -



We have Z-14 and a continental IO-550N in a Lancair ES. We put two 20 AH  

Panasonic VRLA (AGM) batteries. WE plan to use just one for cranking. So  

far, it cranks it like a champ. We can crossfeed if necessary, but will  

have to leave the avionics off. The second system is basically our  

"avionics" buss.



The batteries are very reasonably priced. We got two (LC-X1220P) from  

DigiKey. We did not pay attention to the weight because we needed it in  

the aft compartment for W&B purposes. Besides, if you go IFR in an all  

electric aircraft, weight for batteries should be lower on the priority  

list than reliable electricals. YMMV, IMHO, my .02 cents.

John

 	  Quote: 	
		   My only reason for not going with the dual odyssey 680 solution is the

 weight penalty - I'm very concerned that the -10 will be heavy and want  

 to

 do anything reasonable to save weight. However, I don't want to  

 compromise

 on system reliability/safety since I'll be traveling with my entire  

 family.

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tgesele(at)optonline.net
Guest

Posted: Wed Aug 16, 2006 4:00 am Post subject: Dual Battery/Alternator Question

First, thanks to Bob and the others for their responses/suggestions.



I am using Z-14 for the electrical system, the alt out loads are 12-15 amps.

The reason for the dual bat/alt system is simply the piece of mind it gives

for if I'm IMC with my two small children in the plane with me. The concept

of two independent systems has been drummed into me since I started flying.



 	  Quote: 	
		  From what I can tell, the cost issue amounts to around $40 every couple of

years and, considering the operating costs of the plane, won't influence my
	


decision and the weight is only an issue for the dual 680 solution. If there

is another reason to go with Z-13 over Z-14, please let me know.



Thanks again for the help

  - Tom Gesele



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