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Is there any reason to have a separate battery and alt swit

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peterz(at)zutrasoft.com
Guest

Posted: Fri May 15, 2020 10:22 am Post subject: Is there any reason to have a separate battery and alt swit

Hi Jim!



Could you share the Miller design? I assume it can be easily tweaked go give earthX battery charge levels(?)



Cheers snd thx!

Pete 

C-GNPZ



 	  Quote: 	
		   On May 15, 2020, at 1:58 PM, h&amp;jeuropa <butcher43(at)att.net> wrote:

 

 

 

 Will,

 

 As Gilles pointed out above, the weak point of the Rotax system is the Ducatti rectifier/regulator.  The electrical design is fine, the problem is the construction.  Early ones, P/N 343620, had diodes that unsoldered internally.  There is an easy work around for this (2 external diodes).  Later ones, P/N 362001, are poorly manufactured with cold solder joints, unsoldered joints and mechanical failures. Either one seems to work pretty well if the load is kept low, certainly less than 10 amps and best if closer to 5 amps.

 

 Silent Hektik regulators, made in Germany have been used by many Rotax owners.  They are difficult to purchase in the US, although they may be available from Vans Aircraft as an alternate on the RV12.

 

 Some owners have purchased John Deere garden tractor regulators and used them with success.   Part number AM101406 is usually the one mentioned. 

 

 B&C Speciality has just developed a replacement for Ducatti, the part number is AVC1.  You can find an install manual on their website but it's not yet listed for sale.

 

 I built a Mike Miller replacement.  Mike is an electrical engineer with a RV12.  Ducatti failures are pretty common in them.  He inspected many failed Ducatti units and summarized the problems as stated above.  He designed a replacement that is electrically identical but has more robust components  and most importantly larger heat sink.  His will operate at 20 amps all day!  

 

 Our Europa draws about 8 amps in flight.  We used an early Ducatti with external diodes for many years.  At some point we purchased the later model Ducatti and used that for a couple years.  Finally a year ago I built the MM replacement and have had no problems.

 

 I hope this offers some insight and maybe solutions.  Your 70A spike sounds like an instrumentation problem, but other than temporarily installing a second ammeter, I don't have a solution in mind.

 

 Jim Butcher

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=496382#496382

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h&jeuropa

Joined: 07 Nov 2006
Posts: 645

Posted: Sat May 16, 2020 3:46 am Post subject: Re: Is there any reason to have a separate battery and alt s

Hi Pete,



Attached is the main instruction document.  It explains what is involved in the construction and also gives an excellent explanation of how the circuit operates.  Let me know if you are interested in proceeding as there have been a few minor changes.



Jim

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Instructions v1.pdf

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Instructions v1.pdf

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peterz(at)zutrasoft.com
Guest

Posted: Sat May 16, 2020 4:03 am Post subject: Is there any reason to have a separate battery and alt swit

Hi Jim!



 Many thx!



I looked over the instructions, and looks quite straightforward......i think tho i’ll keep it in my back pocket as plan B in case an AVC1 purchase doesn't pan out (the overall effort due to its pcb and parts lead-times are detractors for me).  The over-voltage feature of the AVC1 is also quite tempting 



Thx again,

Pete 

 	  Quote: 	
		   On May 16, 2020, at 7:46 AM, h&amp;jeuropa <butcher43(at)att.net> wrote:

 

 

 

 Hi Pete,

 

 Attached is the main instruction document.  It explains what is involved in the construction and also gives an excellent explanation of how the circuit operates.  Let me know if you are interested in proceeding as there have been a few minor changes.

 

 Jim

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=496401#496401

 

 

 

 

 Attachments: 

 

 http://forums.matronics.com//files/instructions_v1_167.pdf

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