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Charging Dual Batteries

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bbradburry(at)allvantage.
Guest

Posted: Wed Jan 31, 2007 5:25 am Post subject: Charging Dual Batteries

Am I missing something?  It seems to me that, on Z19, if you have 

anything feeding from the engine battery buss, the engine battery will 

slowly be discharged unless you close the contactor.  It appears that it 

will not be hooked to the alternator and charged unless the engine 

battery contactor is closed.

Somebody please 'splain this to me??

What would be the operating technique if it doesn't charge?  Close the 

contactor periodically?  If so how often and for how long??



Thanks,

Bill B

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dennis.glaeser(at)eds.com
Guest

Posted: Wed Jan 31, 2007 6:26 am Post subject: Charging Dual Batteries

I don't think you're missing anything -

I'm using the essentially the Z19 architecture and plan to keep both

contactors closed all the time for normal operations, so both batteries

are charged by the alternator.

My procedure for alternator failure is: E-Bus Switch ON, both Masters

OFF.  This isolates the batteries and lets them independently power the

items connected to their hot busses.



Dennis Glaeser



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

Am I missing something?  It seems to me that, on Z19, if you have 

anything feeding from the engine battery buss, the engine battery will 

slowly be discharged unless you close the contactor.  It appears that it



will not be hooked to the alternator and charged unless the engine 

battery contactor is closed.

Somebody please 'splain this to me??

What would be the operating technique if it doesn't charge?  Close the 

contactor periodically?  If so how often and for how long??



Thanks,

Bill B

- The Matronics AeroElectric-List Email Forum -

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nuckollsr(at)cox.net
Guest

Posted: Wed Jan 31, 2007 6:41 am Post subject: Charging Dual Batteries

At 08:27 AM 1/31/2007 -0500, you wrote:



 	  Quote: 	
		  

<bbradburry(at)allvantage.com>



Am I missing something?  It seems to me that, on Z19, if you have anything 

feeding from the engine battery buss, the engine battery will slowly be 

discharged unless you close the contactor.  It appears that it will not be 

hooked to the alternator and charged unless the engine battery contactor 

is closed.

Somebody please 'splain this to me??

What would be the operating technique if it doesn't charge?  Close the 

contactor periodically?  If so how often and for how long??


	


    Any time an alternator is running and the

    low voltage warning light is out, then

    ALL battery contactors on ALL architectures

    are closed.



    Only when engine driven power sources are

    not available does one go to Plan-B. The

    details of this plan varies depending on the

    specific architecture. When the low voltage

    light comes on, you then move to a pre-planned

    activity that maximizes utilization of a

    scarce but hopefully well quantified resource -

    energy in the battery(ies).



    Your time aloft in the endurance mode is calculated

    and then perhaps demonstrated under Plan-B which

    will probably call for all battery contactors to

    be open in for the en route phase of flight with

    perhaps some closure of contactors during the approach

    to landing phase . . . depending on what conveniences

    can be added without jeopardizing a comfortable

    arrival with the earth.



        Bob . . .



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

        ( IF one aspires to be "world class",  )

        ( what ever you do must be exercised   )

        ( EVERY day . . .                      )

        (                  R. L. Nuckolls III  )

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

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