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What Capacitor Size?

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jnmeade

Joined: 27 Sep 2012
Posts: 12

Posted: Thu Jan 10, 2019 7:05 am Post subject: What Capacitor Size?

I am installing an auxiliary 40A external alternator (with internal  

voltage regulator) on a Rotax 912ULS engine.  How do I determine the right  

specs on the capacitor?



The Rotax wiring diagram calls for a capacitor but there is no schematic  

or other source of information on the capacitor specs that I can find.



(This question is not about the existing 22,000 uf capacitor on the Rotax  

internal permanent magnet 18A generator.)



How do I determine the desired characteristics of a capacitor in this kind  

of application?



Thanks

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kenryan

Joined: 20 Oct 2009
Posts: 426

Posted: Thu Jan 10, 2019 7:27 am Post subject: What Capacitor Size?

You might want to ask the folks at rotax-owner.com forum. I think I read there that the capacitor for the external alternator is a mistake and no capacitor is required.



Sent from my Android. Sorry Steve.



On Thu, Jan 10, 2019, 10:21 James Meade <jnmeade(at)southslope.net (jnmeade(at)southslope.net) wrote:



 	  Quote: 	
		  --> AeroElectric-List message posted by: "James Meade" <jnmeade(at)southslope.net (jnmeade(at)southslope.net)>

 

 I am installing an auxiliary 40A external alternator (with internal  

 voltage regulator) on a Rotax 912ULS engine.  How do I determine the right  

 specs on the capacitor?

 

 The Rotax wiring diagram calls for a capacitor but there is no schematic  

 or other source of information on the capacitor specs that I can find.

 

 (This question is not about the existing 22,000 uf capacitor on the Rotax  

 internal permanent magnet 18A generator.)

 

 How do I determine the desired characteristics of a capacitor in this kind  

 of application?

 

 Thanks

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user9253

Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan

Posted: Thu Jan 10, 2019 8:08 am Post subject: Re: What Capacitor Size?

Any size capacitor will not do much good.

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_________________
Joe Gores

nuckolls.bob(at)aeroelect
Guest

Posted: Thu Jan 10, 2019 8:40 am Post subject: What Capacitor Size?

At 08:57 AM 1/10/2019, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "James Meade" <jnmeade(at)southslope.net>



 I am installing an auxiliary 40A external alternator (with internal  

 voltage regulator) on a Rotax 912ULS engine.  How do I determine the right  

 specs on the capacitor?



 The Rotax wiring diagram calls for a capacitor but there is no schematic  

 or other source of information on the capacitor specs that I can find.



 (This question is not about the existing 22,000 uf capacitor on the Rotax  

 internal permanent magnet 18A generator.)



 How do I determine the desired characteristics of a capacitor in this kind  

 of application? 	


   I have discovered with bench testing that

   the legacy capacitor installed on the

   majority of alternators serves no

   useful purpose. You can leave it

   out if you wish.



 

 

   Bob . . .

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