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Plane Power alternator $$$$
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Coastflyer

Joined: 20 Mar 2016
Posts: 13

Posted: Fri Dec 29, 2023 9:44 am Post subject: Re: Plane Power alternator $$$$

That’s ok Bob, I wanted to replace the battery anyway. I do appreciate your analysis.

I took some video yesterday, still with the old battery.



https://youtu.be/1TluvrVBLJo?si=IkUwgLP910Cht7Kt

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nuckolls.bob(at)aeroelect
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Posted: Fri Dec 29, 2023 10:59 am Post subject: Plane Power alternator $$$$

At 11:44 AM 12/29/2023, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "Coastflyer" <jessejenks72(at)gmail.com>



 That’s ok Bob, I wanted to replace the battery anyway. I do appreciate your analysis.

 I took some video yesterday, still with the old battery.



  https://youtu.be/1TluvrVBLJo?si=IkUwgLP910Cht7Kt 	
 

    That's interesting. The period of oscillation

    is too long to be a regulation issue especially

    since the voltage is not similarly afflicted.

    It will be interesting to see if it persists

    with the new battery.



    How old is the present battery? Have

    you recently cap-checked it?



    It's a strong suggestion of some accessory

    load . . . but what?  This began after

    installation of the new alternator?



 

 

   Bob . . .



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    on physics and good practice.

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Ceengland

Joined: 11 Oct 2020
Posts: 393
Location: MS

Posted: Fri Dec 29, 2023 11:34 am Post subject: Plane Power alternator $$$$

On Fri, Dec 29, 2023 at 11:47 AM Coastflyer <jessejenks72(at)gmail.com (jessejenks72(at)gmail.com)> wrote:



 	  Quote: 	
		  --> AeroElectric-List message posted by: "Coastflyer" <jessejenks72(at)gmail.com (jessejenks72(at)gmail.com)>

 

 That’s ok Bob, I wanted to replace the battery anyway. I do appreciate your analysis.

 I took some video yesterday, still with the old battery.

 

 https://youtu.be/1TluvrVBLJo?si=IkUwgLP910Cht7Kt



	
I'd suggest taking a long hard look at the circuit between your current shunt and the engine monitor. If it's a resistance type shunt and you have the recommended protective fuses in the sense lines (or a flaky connection anywhere in either line), then  you will see wildly varying current displayed with no actual changes in current. My Dynon monitor was installed with glass fuses in those lines, and it does exactly what yours is doing. Reaching under the panel and wiggling inline fuse holders will (temporarily) make the symptom go away.

Charlie



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_________________
Charlie

Coastflyer

Joined: 20 Mar 2016
Posts: 13

Posted: Fri Dec 29, 2023 12:28 pm Post subject: Re: Plane Power alternator $$$$

Thanks Charlie, I will check out those wires. I don’t think I have fuses in them but will check all the connections. It’s possible I could have damaged one of the connections at the shunt when I was hurriedly removing the cover on the current limiter (which is right above the shunt) after the original alternator failure.



 Bob, I will try isolating all the loads. I think I already tried turning the avionics master off, and I have turned off all the exterior lighting, but I will try everything again. It could be the Dynon… I could pull the fuse and run it on its backup battery. Otherwise, there is only the alternator field, battery solenoid, and elevator trim, and a USB charge outlet. I did unplug my phone, but will try pulling the fuse.

Yes, the oscillation started when I installed the new alternator. The battery is 5 years old and I haven’t done a capacity test, and it did get deeply discharged during the alternator failure flight.

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