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Alternators & Electrical Supply

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Gosh, you pilots are smart.......and complicated.

I believe that all of the above post have correct answers pertaining to the aircraft they are in reference to.

I think the basic theory that contains the answer you are looking for is this:
You need the battery to start the engine that drives the alternator/generator that resupplies the battery after the cycle is complete.
i.e. once the engine is running, you do not need the battery unless the alternator/generator is not supplying the minimun voltage/amperage.
 

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