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Hi. I fitted a lithium battery, hoping it would fix an intermittent Lane B fault (no luck). The lane voltages were 14.0 and 13.8 V (B and A respectively). The battery was 13.1. It is an Earth X battery with a battery management system. Thanks! 

  • Re: Lane voltages higher than battery viltages

    by » one month ago


    I think that is all normal. The alternator and regulator/rectifier make a voltage then there is a little voltage loss from there to the battery. Poor connections can cause a bigger loss as can cables that are too small. Clean the terminals, the lugs and connectors and see if the voltage drop decreases.


  • Re: Lane voltages higher than battery viltages

    by » one month ago


    So does that mean the the alternator powers the lanes and not the battery? Does that mean that the alternator always produces maximum voltage even if there is not much of a load? Does that mean the battery never discharges under normal operation? Does it not even act as a sort of capacitor for fluctuations in load or voltage? Is there a book I can read? I don’t understand this at all.  Thank you so much for your reply! 


  • Re: Lane voltages higher than battery viltages

    by » one month ago


    There are two alternators. One (alternator A) powers the engine electrical system and alternator B powers the aircraft electrical system including charging the battery. When you start the engine, the two circuits are tied together so the battery can power the engine system. Once you have started and rpm increases above 2500, the two systems are separated again. 

    So your lane A and B voltages have nothing to do with battery voltage when the engine is running correctly.

     

    The only time they might be the same is before you start the engine.


    Thank you said by: Bill Hertzel

  • Re: Lane voltages higher than battery viltages

    by » one month ago


    operators manual section 7-4


  • Re: Lane voltages higher than battery viltages

    by » one month ago


    Andrew Asked,

    So does that mean that the alternator powers the lanes and not the battery?
    YES!

    Does that mean that the alternator always produces maximum voltage even if there is not much of a load?
    YES!

    Does that mean the battery never discharges under normal operation?
    YES!

    Does it not even act as a sort of capacitor for fluctuations in load or voltage? 
    Only for the Panel Loads, Not the Engine.
    - - -

    It sounds like you understand it all pretty well.
    - - - - -

    To determine what is causing the Intermittent Lane Fault, Connect your BUDS Software and interrogate the Fault Log.


    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Bill.Hertzel@Yahoo.com
    Clicking the "Thank You" is Always Appreciated.


    Thank you said by: Karl Kistler

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