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nuckolls.bob(at)aeroelect
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 Posted: Sun Apr 03, 2016 8:21 am Post subject: Rotax alternator problem |
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| Quote: | I am building a Bristell RG powered by Rotax 912ULS and I was wondering if you could help me.
There is the Rotax own alternator build in already that produces around 18A and I intend to install the BC425-H as well.
My question is how I can wire this in parallel just as per figure 17-8 as Auxiliary Alternator with Autoswitching. I am not too sure how I can make the Rotax 18A alternator to work with the BC425-H. |
"Autoswitching" is of little or no operational value . . .
your airplane is not going to crash and burn because of
primary alternator failure . . . the low voltage warning
light comes on, you turn off main alternator and turn
on standby alternator. If you're drinking a cup of
coffee when the light comes on, finish the cup before
you start flipping switches . . . you don't want your clothes
to smell like coffee when you land.
Wire each alternator to the system as if it was the
only alternator. Fit the system with low voltage warning.
Fly comfortably.
Bob . . .
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user9253
Joined: 28 Mar 2008
Posts: 1920
Location: Riley TWP Michigan
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| Posted: Sun Apr 03, 2016 2:30 pm Post subject: Re: Rotax alternator problem |
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Are you sure that a second alternator is required? Hundreds of Van's RV-12s are flying with only the Rotax 912ULS built-in alternator. Many of those RV-12s have dual glass panels and LED strobes and a LED landing light. The landing gear of the Bristell RG can run off from the battery for the short time it operates.
The Rotax alternator has no moving parts except for the engine flywheel (with permanent magnets). So it is highly unlikely to fail. However, a backup Rectifier/Regulator could be considered.
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Joe Gores |
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