nuckolls.bob(at)aeroelect
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 Posted: Wed Sep 07, 2011 1:10 pm Post subject: Batteries aboard aircraft |
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At 12:36 PM 9/7/2011, you wrote:
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On 9/7/2011 12:51 AM, Robert L. Nuckolls, III wrote:
> If those are testing under 200A, they're not
> even flight worthy. I'll bet they cap-check at
> under 50% of new.
What do you mean by "cap-check"?
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Capacity check. How long will the battery run
useful items in an alternator-out condition . . .
or how long will the battery run certain gizmos on
the ground . . . and perhaps still start the engine?
A load-test goes to starting engines, a cap-check
goes to KNOWING with CONFIDENCE what kind of an
energy budget you can support with the fully charged
battery. Batteries are sized in the heavy iron
such that they supply specific loads for 30 minutes
during alternator/generator-out events when
worn to 80% of as-new capacity.
They still crank the engine just fine . . . but no
longer meet design goals operations under loss of
engine driven power sources.
Suggest you review Chapter 2 of The 'Connection.
Bob . . .
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