Sorry for the long delay. My virus protection doesn't like the matronics site.
As for the ROTAX alternator. It is a dynamo so it does not require electrical
excitation of the field circuit as there is none. Even the ignition coils in
the stator are self generating. Pretty simple, basically a big lawn mower
electrical
system. So either battery, dynamo (ROTAX alternator), or both is not
going to hurt a thing.
Your automotive or standard alternator (even certified aircraft) require voltage
to excite a field current before the rotating coils can provide power.
Alternators
are lighter, more powerful and cheaper to make watt to watt.
An alternator is dependent on the battery to initiate the field. Cut the field
and battery in a Cessna, then turn on only the battery, and the alternator will
not fire, unless there is residual voltage stored in a capacitor in the system
with enough energy to excite the field coil. To my limited knowledge of all
solid state equipment currently available, that power backup to the main bus
to excite an alternator field is no longer available. All backup batteries
simply power the box only.
Best Regards,
Bud Yerly
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