ashleysc(at)broadstripe.n
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 Posted: Sun Aug 06, 2017 6:01 pm Post subject: Backup Alternator / Backup Battery Sanity Check |
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Hi Art;
For what it's worth, I have two 20 amp, internally regulated, permanent magnet alternators and one battery. Caution: System is untried at this time.
Cheers! Stu.
From: "Art Zemon" <art(at)zemon.name>
To: aeroelectric-list(at)matronics.com
Sent: Sunday, August 6, 2017 10:41:33 AM
Subject: AeroElectric-List: Backup Alternator / Backup Battery Sanity Check
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?
-- Art Z.
--
https://CheerfulCurmudgeon.com/"If I am not for myself, who is for me? And if I am only for myself, what am I? And if not now, when?" Hillel
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