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Dual batteries with single alternator

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rv7ator

Joined: 21 Dec 2006
Posts: 2

Posted: Tue Jul 03, 2007 8:16 am Post subject: Dual batteries with single alternator

I am building a RV-7 with an all electric panel. I  am considering using two batteries and one alternator. I am looking for a  circuit to use the batteries isolated if there is a problem with the other or  the alternator.  I will probably have only a main bus and a batt  bus.

  

 Thanks in advance.

  

 Ed

    [quote][b]

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nuckollsr(at)cox.net
Guest

Posted: Tue Jul 03, 2007 8:39 am Post subject: Dual batteries with single alternator

At 11:14 AM 7/3/2007 -0500, you wrote:



 	  Quote: 	
		  I am building a RV-7 with an all electric panel. I am considering using 

two batteries and one alternator. I am looking for a circuit to use the 

batteries isolated if there is a problem with the other or the 

alternator.  I will probably have only a main bus and a batt bus.



Thanks in advance.



Ed


	


  Have you reviewed the materials at:



http://aeroelectric.com/articles/Rev11/AppZ_R11J.pdf



  If you don't have a copy, I'll suggest that you acquire

  the AeroElectric Connection and review the chapter

  on system reliability.



  The optimal all electric system for weight, simplicity

  and cost of ownership is Figure Z-13/8 in the

  document cited above. Without knowing what engine

  you're planning, I'll suggest you start with that

  Figure.



  If it's a Subaru conversion, then a second alternator

  is not in the stars. Then you might consider

  Figure Z-19.



  Your concerns about "battery problems" are not well

  founded. Assuming you plan to actively monitor battery

  performance and replace when capacity falls below

  established limits, then you need nothing more

  sophisticated than a low voltage warning light and

  the architecture that allows you to position switches

  for comfortable termination of flight.



        Bob . . .



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

        ( "Physics is like sex: sure, it may   )

        ( give some practical results, but     )

        ( that's not why we do it."            )

        (                                      )

        (                 Richard P. Feynman   )

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

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