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Backup alternator questions

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mike.corder(at)sbcglobal.
Guest

Posted: Fri Dec 28, 2007 7:53 pm Post subject: Backup alternator questions

I have the B&C 8 amp backup alternator along with a main Plane Power 60 

amp unit. When I have them both on line, it seems like the voltage jumps 

around a lot. Suspect the two voltage regulators are "fighting" each 

other as voltage is stable with either unit running by itself. Is this a 

problem ?



I'd like to leave the backup unit offline and only bring it online when 

the primary unit goes away. However, since both warning lights are taken 

to Ground to light up, I can't figure out a circuit which would allow 

this mode of operation. Any suggestions ?



-- 



Regards,

m

____________________________



mike.corder(at)sbcglobal.net

Cell 831-239-0915

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nuckolls.bob(at)cox.net
Guest

Posted: Sat Dec 29, 2007 8:03 am Post subject: Backup alternator questions

At 07:51 PM 12/28/2007 -0800, you wrote:



 	  Quote: 	
		  



I have the B&C 8 amp backup alternator along with a main Plane Power 60 

amp unit. When I have them both on line, it seems like the voltage jumps 

around a lot. Suspect the two voltage regulators are "fighting" each other 

as voltage is stable with either unit running by itself. Is this a problem ?


	


   Won't hurt anything but these two devices were

   not designed nor intended to operate together.

 	  Quote: 	
		  I'd like to leave the backup unit offline and only bring it online when 

the primary unit goes away. However, since both warning lights are taken 

to Ground to light up, I can't figure out a circuit which would allow this 

mode of operation. Any suggestions ?


	


   Wire per 13/8 and leave the waring light off

   the SD8.



        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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andrewbutler(at)ireland.c
Guest

Posted: Sat Dec 29, 2007 11:50 am Post subject: Backup alternator questions

Hi Mike,



Attached is my Z13/8 variation that splits the bus for dual power supply to an electronic ignition with a cross over relay  in case either power supply fails.



Haven't wired it up yet, but this is my general plan. I also struggled with a low voltage warning for each power supply prior to splitting the bus, and I ended up concluding that it doesn't make real sense unless the bus is split.



In practise, I will probably monitor the backup bus voltage from my AFS3500 EFIS, that allows you to hook up a primary and secondary power source and then set alarms on each.



Andrew.

 

 [quote]---

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