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Rotax capacitor

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JimT

Joined: 27 Feb 2006
Posts: 22
Location: Auburn, ME

Posted: Sun May 11, 2008 4:52 pm Post subject: Rotax capacitor

I have a new 0.5 farad capacitor sitting around.  It was left over from a step sons car audio adventure.  I was thinking about using it for the capacitor in my Rotax powered project. Since it will likely discharge after some shutdowns,  This device would likely look like a short circuit, transiently for every start up.   is this a reasonable expectation?   Would this be too stressful for the battery?  I would guess the battery would try to charge it long before the starter starts to crank.  Plan your next roadtrip with MapQuest.com: America's #1 Mapping Site. 

  [quote][b]

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nuckolls.bob(at)cox.net
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Posted: Sun May 11, 2008 6:45 pm Post subject: Rotax capacitor

At 08:48 PM 5/11/2008 -0400, you wrote:



 	  Quote: 	
		  I have a new 0.5 farad capacitor sitting around.  It was left over from a 

step sons car audio adventure.  I was thinking about using it for the 

capacitor in my Rotax powered project. Since it will likely discharge 

after some shutdowns,  This device would likely look like a short circuit, 

transiently for every start up.   is this a reasonable 

expectation?   Would this be too stressful for the battery?  I would guess 

the battery would try to charge it long before the starter starts to crank.


	


    These things are 'tempting' . . . they offer a potential

    for a very "quiet" system. However, your misgivings are

    well founded. Capacitors this large present some system

    dynamics at periods MUCH longer than those presented by

    classic noise sources. Getting these puppies charged up

    is not a trivial concern. Further, they boost the potential

    for short but exceedingly large fault currents in case of

    a short.



    The battery and/or alternator are not at risk for damage.



    I recommend that you stick with the smaller devices which

    certainly perform to expectations and offer no special

    risks.



    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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