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1. 07:12 AM - Re: Power Generation without Battery? (user9253)
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| Subject: | Re: Power Generation without Battery? |
Lightspeed and others recommend connecting electronic ignition directly to the
battery. Since Lithium batteries have been known to short out, maybe they should
not be used. If the battery shorts out, so will the alternators be shorted.
Another failure mode to be considered is a failed master contactor shortly after
takeoff. That is not very likely to happen, but it could. Regardless of
what the manufacturers say, an alternator could keep supplying power to the aircraft
electrical system. Thus the pilot would not know that the master contactor
has opened. If the duration of the flight is longer than the energy stored
in the battery (likely with a Li battery), then the engine will quit. A solution
to the failed master contactor scenario is a relay in parallel (disabled
during engine cranking).
Even if these failure modes are unlikely, everything needs to be considered when
designing an electrical system. Accidents happen sometimes due to unlikely
and unexpected chain of events.
Joe
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Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=437550#437550
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