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What Capacitor Size?

 
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jnmeade



Joined: 27 Sep 2012
Posts: 5

PostPosted: Thu Jan 10, 2019 7:05 am    Post subject: What Capacitor Size? Reply with quote

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: 315

PostPosted: Thu Jan 10, 2019 7:27 am    Post subject: What Capacitor Size? Reply with quote

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: 1350
Location: Riley TWP Michigan

PostPosted: Thu Jan 10, 2019 8:08 am    Post subject: Re: What Capacitor Size? Reply with quote

Any size capacitor will not do much good.

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PostPosted: Thu Jan 10, 2019 8:40 am    Post subject: What Capacitor Size? Reply with quote

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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