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Self excitation

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dballin(at)gmail.com
Guest

Posted: Thu Jan 04, 2007 10:03 am Post subject: Self excitation

There were some posts on self exciting alternators and a new z 25

figure to make the SD-8 self exciting.  My question is how necessary

is this?  I am working on a Legacy dual alt (70 and an SD-20) dual

battery with EI  (using z-14 as a starting point).  My understanding

of this is that if the battery is totally dead then an alternator will

not "start".  I don't think I would start a flight that way, but could

imagine a battery disconnect of some sort in flight.  My question is

should I design the system so one or both of the alternators are self

exciting or is this overkill.  Any thoughts appreciated.



Thanks

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highflight1(at)gmail.com
Guest

Posted: Thu Jan 04, 2007 4:53 pm Post subject: Self excitation

Dan, 

 With a dual alternator AND dual battery system, you're worrying way too much about a self-starting alternator.

 Where you might want to consider a self-starting alternator is if you were going with just one battery.

 If your entire system goes down and you lose both batteries as well, I think you'd be in a lot more hurt than could be resolved with a self-starting alternator.

  

 Build your dual/dual system correctly, and change out your batteries for new ones once in a while, and you'll never have to worry about power. Since I doubt if you're going to be installing de-icing equipment on that Legacy, my opinion is that you're taking your system further than is practical anyway. 

  

 Vern



 

 On 1/4/07, Dan Ballin <dballin(at)gmail.com (dballin(at)gmail.com)> wrote:  	  Quote: 	
		  --> AeroElectric-List message posted by: "Dan Ballin" dballin(at)gmail.com  (dballin(at)gmail.com)



  My question is how necessary is this?  I am working on a Legacy dual alt (70 and an SD-20) dual

battery with EI  (using z-14 as a starting point).  	
  

  



 

[b]

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