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theidtke(at)cox.net
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 Posted: Thu Oct 01, 2015 3:24 pm Post subject: Grounding Question On dual Buss Dual Battery Aircraft |
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Hello everyone, I am new here, building a Prescott Pusher, and have a question. My plane is totally electric dependent and so I have been following the Aero Connection Diagram Z-19 which addresses an outline for a dual battery, single alternator, and totally electronic fuel injection system. Additionally, I have subscribed 100% to the wiring philosophy whereby all powered device grounds go directly to the battery running the device instead of the massive common ground to frame approach (I have a metal sub-frame with composite skins over it). As illustrated in Diagram Z-19, I have set up primary and secondary batteries and busses with diodes so that #1 fuel pump and ECU have power all the time from #1 battery. In case of battery failure, flipping secondary power switch sends power from #2 battery through the diode to #1 fuel pump and ECU. The challenge is that if I remain pure to the philosophy of power and ground for any device go to/from the same battery, #1 fuel pump and ECU are not grounded and so if secondary power switch is turned on, pump does not work…..obviously since it is not grounded to #2 battery. So I could add a switch to switch grounds (another level of complexity), or, wire the grounds together at the fuel pump connection in the back of the plane. Which approach is better? It is not really addressed in the diagram….that I can interpret anyway. Maybe I am being overly cautious about the grounding thing but am trying desperately not to end up with ground loops – about 70% wired and so far so good, except for this condition. Any and all help appreciated…..
Thank you
Trent
[quote][b]
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bob.verwey(at)gmail.com
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| Posted: Thu Oct 01, 2015 10:17 pm Post subject: Grounding Question On dual Buss Dual Battery Aircraft |
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Hey Trent, my favorite aeroplane!
What power plant?
On 2 October 2015 at 01:22, Trent Heidtke <theidtke(at)cox.net (theidtke(at)cox.net)> wrote:
| Quote: |
Hello everyone, I am new here, building a Prescott Pusher, and have a question. My plane is totally electric dependent and so I have been following the Aero Connection Diagram Z-19 which addresses an outline for a dual battery, single alternator, and totally electronic fuel injection system. Additionally, I have subscribed 100% to the wiring philosophy whereby all powered device grounds go directly to the battery running the device instead of the massive common ground to frame approach (I have a metal sub-frame with composite skins over it). As illustrated in Diagram Z-19, I have set up primary and secondary batteries and busses with diodes so that #1 fuel pump and ECU have power all the time from #1 battery. In case of battery failure, flipping secondary power switch sends power from #2 battery through the diode to #1 fuel pump and ECU. The challenge is that if I remain pure to the philosophy of power and ground for any device go to/from the same battery, #1 fuel pump and ECU are not grounded and so if secondary power switch is turned on, pump does not work…..obviously since it is not grounded to #2 battery. So I could add a switch to switch grounds (another level of complexity), or, wire the grounds together at the fuel pump connection in the back of the plane. Which approach is better? It is not really addressed in the diagram….that I can interpret anyway. Maybe I am being overly cautious about the grounding thing but am trying desperately not to end up with ground loops – about 70% wired and so far so good, except for this condition. Any and all help appreciated…..
Thank you
Trent
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ist" target="_blank">http://www.matronics.com/Navigator?AeroElectric-List
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Best...Bob Verwey
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user9253
Joined: 28 Mar 2008
Posts: 1921
Location: Riley TWP Michigan
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| Posted: Fri Oct 02, 2015 5:37 am Post subject: Re: Grounding Question On dual Buss Dual Battery Aircraft |
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Yes, you are being overly cautious about grounding and might create more serious problems. Connect the negative terminal of each battery to a common ground point and connect the negative side of all loads to that common point. Doing that will not create ground loops.
Consider dual alternators instead of dual batteries, perhaps Z-13/8.
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Joe Gores |
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kjashton(at)vnet.net
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| Posted: Fri Oct 02, 2015 6:31 am Post subject: Grounding Question On dual Buss Dual Battery Aircraft |
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Ditto on avoiding ground loops (a small difference in ground potential at different ground points that causes a small current loop). In my Cozy, I pulled was puzzled for years by a squirrelly fuel pressure indicator. The FP sender was grounded at the engine, FP gauge grounded up front. It is really a problem with gauging systems that use tiny currents. Probably not so much with big-amp devices.
-Kent
| Quote: | On Oct 2, 2015, at 9:38 AM, user9253 <fransew(at)gmail.com> wrote:
Yes, you are being overly cautious about grounding and might create more serious problems. Connect the negative terminal of each battery to a common ground point and connect the negative side of all loads to that common point. Doing that will not create ground loops.
Consider dual alternators instead of dual batteries, perhaps Z-13/8.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=447588#447588
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theidtke(at)cox.net
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| Posted: Fri Oct 02, 2015 1:55 pm Post subject: Grounding Question On dual Buss Dual Battery Aircraft |
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Hi Bob,
The Prescott Pusher I am building is using a Mazda 20B 3-rotor engine. I live in the AZ desert so particularly in the summer when going North to Prescott, Sedona, or Flagstaff I need a bit more than 200 HP/60 inch prop (original spec’d items) to get me off the ground. Mazda 3-rotor was about the only weight/HP choice to keep W/B about as close to original as possible. Still about a year and a half from finishing but everything has been on it to check fit/function. Just trying to make sure I am doing wiring right at this point.
Trent
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Bob Verwey
Sent: Thursday, October 01, 2015 11:14 PM
To: aeroelectric-list(at)matronics.com
Subject: Re: Grounding Question On dual Buss Dual Battery Aircraft
Hey Trent, my favorite aeroplane!
What power plant?
On 2 October 2015 at 01:22, Trent Heidtke <theidtke(at)cox.net (theidtke(at)cox.net)> wrote:
Hello everyone, I am new here, building a Prescott Pusher, and have a question. My plane is totally electric dependent and so I have been following the Aero Connection Diagram Z-19 which addresses an outline for a dual battery, single alternator, and totally electronic fuel injection system. Additionally, I have subscribed 100% to the wiring philosophy whereby all powered device grounds go directly to the battery running the device instead of the massive common ground to frame approach (I have a metal sub-frame with composite skins over it). As illustrated in Diagram Z-19, I have set up primary and secondary batteries and busses with diodes so that #1 fuel pump and ECU have power all the time from #1 battery. In case of battery failure, flipping secondary power switch sends power from #2 battery through the diode to #1 fuel pump and ECU. The challenge is that if I remain pure to the philosophy of power and ground for any device go to/from the same battery, #1 fuel pump and ECU are not grounded and so if secondary power switch is turned on, pump does not work…..obviously since it is not grounded to #2 battery. So I could add a switch to switch grounds (another level of complexity), or, wire the grounds together at the fuel pump connection in the back of the plane. Which approach is better? It is not really addressed in the diagram….that I can interpret anyway. Maybe I am being overly cautious about the grounding thing but am trying desperately not to end up with ground loops – about 70% wired and so far so good, except for this condition. Any and all help appreciated…..
Thank you
Trent
--
Best...
Bob Verwey
01234567890123
[quote][b]
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