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Rotax 912 Electrical System

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beachyjeff(at)juno.com
Guest

Posted: Sat Feb 24, 2007 2:48 pm Post subject: Rotax 912 Electrical System

Okay electrical gurus, if  you can talk this builder through his electrical phobias, I’ll be both impressed  and grateful. Here’s the scoop.<?xml:namespace prefix = o ns =  "urn:schemas-microsoft-com:office:office" /> 

  

I am building a Zenith CH701  with a Rotax 912ULS. This will be for day VFR.  

  

My Electrical  list: 

Falcon Vertical Card  Compass 

Tachometer 

Skyshops Electric Flaps  w/indicator 

Electric Trim (RAC servo)  w/indicator 

Flight Data Systems GT-50  clock 

Microair M760  Comm 

Microair T2000 Transponder  w/encoder 

PM501  Intercom 

Standard Zenith Supplied  Engine Instruments consisting of: 

             Oil PSI 

             Oil Temp 

             Water Temp 

             Voltmeter 

             L Fuel / R Fuel indicators 

             Hobbs meter (working off an oil pressure sender from Lockwood  Aviation) 

Lowrance 2000C GPS mounted  on panel in an AirGizmos Panel Dock 

One 12v plug-in power source  (for computer, etc) (cigarette lighter without the lighter  part) 

  

I also have strobes and nav  lights.  

  

My plan so far is to use the  following: 

Switches:

Master Switch, 25amp Toggle  Circuit Breaker (which, if I am following this correctly, is used to bring the  battery online—the alternator is always online and protected by a 40 amp  fuse?) 

  

Strobes, 10 amp Toggle  Circuit Breaker 

  

Nav Lights, 10 amp Toggle  Circuit Breaker 

  

Radio/Transponder Circuit, 5  amp Toggle Circuit Breaker 

  

These 4 switches/circuit  breakers will be on one bus bar. 

  

Circuit  Breakers: 

Elec trim, 1  amp 

Elec Flaps, 5  amp 

Instruments, 5  amp 

These will be on a second  bus bar 

Do I also need a circuit  breaker to protect the bus bar?  

Do I need to protect the 12v  plug-in power source? 

I also purchased a MaxiFuse  40 amp since I understand the Rotax alternator circuit requires  one. 

  

I have read Aeroelectric  Connection, which was very helpful, but I still don’t feel comfortable planning  my electrical system without some help. For me, it’s a bit like writing a novel  in French, a language of which I have just the faintest smattering of  knowledge. 

  

So, I need a schematic? I  have Bob Nuckoll’s  Z-16 to help,  along with one from Zenith and one from the Europa Build Manual. The areas that  make little sense to me are the Master Switch/Starting Relay/Regulator  Rectifier. Once I get to the bus bar, it seems simple enough.   

  

So, where do I begin?   

  

Jeff Beachy

Zenith CH701,  85% complete   [quote][b]

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aurbo(at)ak.net
Guest

Posted: Sat Feb 24, 2007 3:32 pm Post subject: Rotax 912 Electrical System

Jeff,

  

 Have you already bought all of those  switch CB's? If not buy just plain toggle switches and stick to the Z-16 plan.  If so you might toss them in a box and buy regular toggle switches any way, that  is exactly what I did.

  

 The Z plans are pretty easy to figure out  if you follow them. The Bus bars are fuse panels, easy enough to buy and then  you can plug in any size of blade fuse you want. 

  

 The Master Switch S700-2-10 toggle switch  is dirt simple and works terrific. 

  

 I bought a pre-made wire harness for my  RV with all the swichable circuit breakers and found it very limiting and  primitive. After finding myself about to put in one more inline fuse I yanked it  all out and dug out the Z-11 schematic and made a list of items need and ordered  them from, www.bandc.biz/, and I  am very glad that I did. The Z plans allow for easy additions and upgrades of  Electro whizzies just by running a couple of wires and plugging in another fuse  of the right size.

  

 If your going to do circuit breakers and  traditional bus bars then it isn't the Z-16.

  

 Mike Ice

 RV-9 

 wiring complete, working on the  canopy

 Anchorage, Alaska

  

  

  

  

 .---

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Gilles.Thesee(at)ac-greno
Guest

Posted: Sat Feb 24, 2007 4:31 pm Post subject: Rotax 912 Electrical System

Michael T. Ice a écrit :

 	  Quote: 	
		   *Jeff,*

 **



 ** 

 *The Z plans are pretty easy to figure out if you follow them. The Bus 

 bars are fuse panels, easy enough to buy and then you can plug in any 

 size of blade fuse you want. *

 ** 

 *The Master Switch S700-2-10 toggle switch is dirt simple and works 

 terrific.*


	


Jeff and all,



I followed figure Z16 with the addition of a dual battery for our 

electrically dependant 914 installation, and we have been very happy 

with it for more than two years now.

The Z figure philosophy is really worth studying.



Regards,

Gilles Thesee

http://contrails.free.fr

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