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jvolkober
Joined: 29 Aug 2010
Posts: 12
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 Posted: Wed Apr 20, 2011 8:22 pm Post subject: E-Bus Diode Question |
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I have a .8 volt drop across my e-bus diode. Voltage in from the main bus is 12.4. Voltage out to the e-bus is 11.6. Can anyone advise if this is normal or if I have problem. Wiring appears correct. Checked it against the diagram on B&C.
John
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nuckolls.bob(at)aeroelect
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| Posted: Thu Apr 21, 2011 7:43 am Post subject: E-Bus Diode Question |
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At 12:22 AM 4/21/2011, you wrote:
| Quote: |
I have a .8 volt drop across my e-bus diode. Voltage in from the
main bus is 12.4. Voltage out to the e-bus is 11.6. Can anyone
advise if this is normal or if I have problem. Wiring appears
correct. Checked it against the diagram on B&C.
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Is this with the alternator running? Sounds like you're
running battery only. So yes, the voltages you're
citing are expected.
The only time the normal feedpath diode is in
service is when the alternator is running. This
gives you a main bus voltage on the order of
14.2 to 14.8 volts. The e-bus runs at 13.4 to
14.0.
When you're running the e-bus battery only, the
diode is out of the loop and the e-bus runs 12.4
down to end of life on the battery . . . about
10.5 volts.
Bob . . .
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fvalarm(at)rapidnet.net
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| Posted: Thu Apr 21, 2011 8:26 am Post subject: E-Bus Diode Question |
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John,
I haven't powered up my B+C E-Buss diode yet but from what I know about
diodes, your measurement is pretty close. The drop may be as low as 0.6
from what I have read here and in the aerolectric connection.
Bevan
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jay(at)horriblehyde.com
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| Posted: Thu Apr 21, 2011 9:00 am Post subject: E-Bus Diode Question |
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Voltage drop across a diode is perfectly normal and expected. Be careful
about what is supplied by the E-Bus though- for example, if you are
supplying power to an EFIS that has a backup battery charging from the EFIS
then that battery will not charge as the voltage is too low.
You can minimise the voltage drop by using a Schottkey diode, which will
bring the voltage drop down to around 0.6V.
Jay
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nuckolls.bob(at)aeroelect
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| Posted: Thu Apr 21, 2011 10:06 am Post subject: E-Bus Diode Question |
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At 04:05 AM 4/21/2011, you wrote:
| Quote: |
Voltage drop across a diode is perfectly normal and expected. Be careful
about what is supplied by the E-Bus though- for example, if you are
supplying power to an EFIS that has a backup battery charging from the EFIS
then that battery will not charge as the voltage is too low.
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Excellent point to ponder. Any devices powered from
the e-bus that contain rechargeable back-up batteries
should evaluated for MINIMUM supply voltage to support
the backup battery. Check manufacturer's installation
data for this information.
At the same time, don't loose track of the notion
that e-busses are configured and managed so that
back-up batteries are not necessary.
Bob . . .
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johnciolino(at)comcast.ne
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| Posted: Thu Apr 21, 2011 10:51 am Post subject: E-Bus Diode Question |
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I have the same drop. But I also have the same question: is this normal?
Bob?
John Ciolino
RV-8
N894Y
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jvolkober
Joined: 29 Aug 2010
Posts: 12
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| Posted: Thu Apr 21, 2011 12:34 pm Post subject: Re: E-Bus Diode Question |
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Thank you all for the input. Responding to Matt's question, I did not have the alternator running at time I took the measurements.
John
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