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Backup Alternator / Backup Battery Sanity Check

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nuckolls.bob(at)aeroelect
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Posted: Sun Aug 06, 2017 11:56 am Post subject: Backup Alternator / Backup Battery Sanity Check

At 12:41 PM 8/6/2017, you wrote:

  	  Quote: 	
		  Folks,



 Can you give me a sanity check? I am building a Bede BD-4C with an MGL EFIS. This is largely a mechanical airplane so manual trim, no gear motors, manual flaps, etc. Between the low current consumption of the EFIS and using LED lights, a backup alternator will run everything in the airplane except the pitot heater; the typical current draw is 21.57 amps and maximum is 31.49 amps. (Pitot heat adds 10 amps.)



 With that in mind, I plan on including a 30 amp backup alternator and no backup battery. I figure:  If the engine is turning, I will certainly have one of the two alternators operable. 
If the engine is not turning, the main battery ought to keep the electrons flowing until I reach the ground. 
Am I missing anything? 	


   Nope



 

 

   Bob . . .

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