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SD-8 on when ?

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mike.corder(at)sbcglobal.
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Posted: Mon May 05, 2008 7:28 pm Post subject: SD-8 on when ?

I have an SD-8 back up alternator on my RV-7A. I'm just curious if most 

people leave it running on all the time (i.e. do the two alternators 

fight each other ?) or just plan on turning it on if the main unit fails.



Mike Corder

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nuckolls.bob(at)cox.net
Guest

Posted: Tue May 06, 2008 5:05 am Post subject: SD-8 on when ?

At 08:24 PM 5/5/2008 -0700, you wrote:



 	  Quote: 	
		  



I have an SD-8 back up alternator on my RV-7A. I'm just curious if most 

people leave it running on all the time (i.e. do the two alternators fight 

each other ?) or just plan on turning it on if the main unit fails.



Mike Corder


	


   The original design philosophy behind Z-13/8 was to use the SD-8

   as a back-up alternator in a two-layer electrical system. There

   is no need nor advantage in running the SD-8 in tandem with the

   main alternator (unless you main alternator is undersized . . .

   in which case you have a design issue much more serious than

   deciding how to run the SD-.



   They don't "fight" each other but there's no operational

   rationale for tandem operation.



   Bob . . .



        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

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

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