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nuckolls.bob(at)aeroelect
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 Posted: Wed Jul 20, 2011 12:21 pm Post subject: Batteries: To fly . . . or not to fly . . . that IS the qu |
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At 09:01 AM 7/20/2011, you wrote:
| Quote: | --> AeroElectric-List message posted by: Bill Watson <Mauledriver(at)nc.rr.com>
I'm forced to reflect on it all after driving my Maule into RDU yesterday, having lunch, and then requiring a 'jump' to get out! What happened? I've been flying around with a marginal battery. It was marginal at my annual a few weeks ago but it was not noticed. |
Toward mitigating that condition, consider
acquiring one of these critters . . .
[img]cid:.0[/img]
http://tinyurl.com/3gnnwrt
This is a carbon-pile load tester for large batteries.
While not a substitute for a real capacity test, the
load tester will give you a bench-mark for the battery's
ability to get the engine started.
A carbon-pile is a special kind of high current, adjustable
resistor.
http://aeroelectric.com/Pictures/Battery_Testers/HF91128_0.jpg
The big-momma clips are hooked to the battery termnials,
you punch the button on the 15 second timer and then
quickly crank the knob clockwise until the voltmeter
drops to the level appropriate to the battery's temperature.
http://aeroelectric.com/Pictures/Battery_Testers/HF91129_4.jpg
Do the best you can to hold the voltage at that level.
When the 15 second timer beeps, observe the current reading
and quickly back off the load. That carbon pile is only good
for a few seconds at those power levels and will probably
"stink".
Generally speaking, if the ammeter shows less than
200 amps after 15 seconds, its time to replace the
critter.
Clipped right across the battery terminals with the engine
running at an RPM where the alternator is expected to
provide full output, you can put the load tester across
the battery and crank the current up until the bus voltage
drops to 13.0 volts (battery isn't delivering or taking on
energy). The reading on the meter PLUS any loads in the
airplane you can't turn off is the output current of your
alternator.
This is a lot of testing bang for the buck.
Bob . . .
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nuckolls.bob(at)aeroelect
Guest
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| Posted: Tue Jul 26, 2011 11:54 am Post subject: Batteries: To fly . . . or not to fly . . . that IS the qu |
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Got an e-mail flyer this morning showing this
guy on sale for $10 off . .
[img]cid:7.1.0.9.0.20110726144735.01e0daf0(at)aeroelectric.com.1[/img]
http://tinyurl.com/3gnnwrt
Bob . . .
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http://www.matronics.com/Navigator?AeroElectric-List |
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