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email(at)jaredyates.com
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 Posted: Sun Jul 16, 2017 3:01 pm Post subject: Z13/8 Schottky Diode Voltage Drop Increasing |
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I was flying along this week in cruise configuration, and was paying closer-than-usual attention to my voltage due to a battery swap. I notice that my main bus is running around 14.3 volts, and my ebus is down around 13.4. It has been a few years since I put this part of the airplane together, but I recall that one of the main selling points of the Schottky diode was to provide less of a voltage drop than that.
Is there a failure mode or degraded condition of the diode that would cause it to have such a large drop? These measurements are with the Skyview EMS, taken right at the fuse block for each bus. My data collection archive for the two buses only goes back to December, but back then I had a more reasonable difference of a half volt or so. It seems like the difference between the two buses is increasing with usage. If this is an indication of an upcoming failure, I'd like to fix it, especially with a possible Oshkosh trip coming up. Things always seem to break on the way to Oshkosh. Has anyone else seen this?
Thanks in advance!
Jared
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user9253
Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan
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| Posted: Sun Jul 16, 2017 4:18 pm Post subject: Re: Z13/8 Schottky Diode Voltage Drop Increasing |
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If the electrical load has not increased since December, then the most likely cause of an extra half volt drop is a bad connection. Fuse holders are likely suspects. Measure the voltage between the two buses by touching both buses with the voltmeter probes. In other words, do not use ground as a reference point. Instead use one bus as a reference and measure various points until the voltage drop is found. The diode might not be the culprit.
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