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h&jeuropa
Joined: 07 Nov 2006
Posts: 645
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 Posted: Sun Jan 20, 2013 12:31 pm Post subject: Z-13 and Dead Battery |
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I'm wondering what happens with a dynamo electrical system like Z-13 if the battery is totally dead and the main alternator is also not functional. The engine can be started by hand propping which will enable the dynamo with its self excitation circuit. When you turn on the AUX ALT the dynamo will be connected to the dead battery, the battery bus and endurance bus.
Will the battery represent a huge load to the dynamo, draw a lot of amperage and drop the system voltage making avionics etc malfunction?
Or since you are on the ground anyway must you charge the battery to some extent with a charger before hand propping and continuing?
Thanks
Jim Butcher
helping with Tailwind
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nuckolls.bob(at)aeroelect
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| Posted: Sun Jan 20, 2013 4:01 pm Post subject: Z-13 and Dead Battery |
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At 02:31 PM 1/20/2013, you wrote:
| Quote: |
I'm wondering what happens with a dynamo electrical system like Z-13
if the battery is totally dead and the main alternator is also not
functional. The engine can be started by hand propping which will
enable the dynamo with its self excitation circuit. When you turn
on the AUX ALT the dynamo will be connected to the dead battery, the
battery bus and endurance bus.
Will the battery represent a huge load to the dynamo, draw a lot of
amperage and drop the system voltage making avionics etc malfunction?
|
Depends. If the battery was dead, Dead, DEAD like the
master switch was left on for a month, then in all likelihood
the battery is kaput. An SD-8 doesn't deliver significant
current at ramp idle or taxi speeds, it's unlikely that
you're going to hurt the SD-8. It might bring the battery
up enough (8 volts or more) to close the battery contactor
whereupon the main alternator would come up and do a much
more robust job of charging the battery.
| Quote: | Or since you are on the ground anyway must you charge the battery to
some extent with a charger before hand propping and continuing?
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Depends. If you're a day-vfr airplane and just wanting
to get the airplane home, then hand propping . . . letting
the main alternator bring the battery up will get you home.
But ANY time the battery suffers a total discharge it should
be recharged and cap checked on the ground to make sure it
meets your design goals for minimum battery performance. In
any case, with a battery taking heavy recharge currents from
the engine driven power sources, I would not turn on much
in the way of electro-whizzies until the low volts warning
light has been out for 5-10 minutes. If the ship's voltmeter
says anything over 11 volts, electro-whizzies should work as
advertised, but leaving the ground without assurances that
the battery is taking on a charge is good pilotage.
Bob . . .
Bob . . .
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