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Ground power for dual battery dual buss Z-14

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Deems Davis

Joined: 09 Jan 2006
Posts: 925

Posted: Tue Jun 10, 2008 4:42 pm Post subject: Ground power for dual battery dual buss Z-14

I would like to install a ground power outlet/jack on my airplane. I 

have a copy of Bob's article from the website. I have a dual battery, 

dual buss (Z14) system installed as close as I could to Bob's diagram. 

Is there anything unique that I should do when installing the above? 

I suppose that the most likely need/use for this would be in the event 

that with the plane away from home base,one or both electric systems 

were left on after engine shutdown, and  both batteries drained to the 

point where they would not crank the engine. 1. If the ground power was 

only installed to connect to one (the primary) battery is there any 

consideration that needs to be taken to protect/isolate the other 

battery during a start using ground power. (The Z14 momentarily couples 

both elec systems together during start). 2. With only a single ground 

power jack is there any 'reasonable' way to 'charge' both batteries 

through this jack?



Exposing my lack of electrical confidence/understanding.



Deems Davis

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AV8ORJWC

Joined: 13 Jul 2006
Posts: 1149
Location: Aurora, Oregon "Home of VANS"

Posted: Tue Jun 10, 2008 5:09 pm Post subject: Ground power for dual battery dual buss Z-14

With the RV-10 and internal ground straps (back in the baggage area) it

is not as critical.  But I love to see electric shrink wrap and

prosealed ends on ground straps that are FWF.  The strap loves to wick

hydrocarbons and promote corrosion - over the life of an aircraft.  It

makes cleaning for Conditional Inspections a breeze.



John Cox



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schaefer(at)rts-services.
Guest

Posted: Sat Jun 14, 2008 2:39 pm Post subject: Ground power for dual battery dual buss Z-14

I would power the external ground relay from the external power.

Use a diode to make sure that the polarity from the external power

is correct before it close the external power to your battery.



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rshannon

Joined: 05 Sep 2007
Posts: 62

Posted: Sat Jun 14, 2008 3:59 pm Post subject: Ground power for dual battery dual buss Z-14

I agree about powering GRND PWR relay from ground power -- there may not be any internal battery power left to turn it ON when you need it most. However, I added a small twist. The GRND PWR switch is on a right side panel that's angled back so it's visible if the pilot looks at it, but not in the normal viewing direction, and a stretch to reach from the left seat, so it could easily be forgotten and left ON when it shouldn't be.

 

The first pole of a DPST switch controls the GRND PWR relay from ground power. However, to alert whenever the switch is ON, the second pole of the switch controls an LED over the switch that is powered from the battery bus. The LED provides an eye catching positive indication, highly visible from the left side, that the GRND PWR switch has been left ON, whether live ground power is connected or not. The switch also has a hinged guard.

 

Overkill perhaps, but... even with polarity, fuse and over-voltage protection on the ground power circuit, I don't want to forget to turn it OFF when I leave the plane (or start to taxi) if it's not supposed to be ON. Of course, I'll probably forget it anyway.  

 

Ron

On Sat, Jun 14, 2008 at 3:32 PM, Richard T. Schaefer <schaefer(at)rts-services.com (schaefer(at)rts-services.com)> wrote:

[quote] --> AeroElectric-List message posted by: "Richard T. Schaefer" <schaefer(at)rts-services.com (schaefer(at)rts-services.com)>

 

 I would power the external ground relay from the external power.

 Use a diode to make sure that the polarity from the external power

 is correct before it close the external power to your battery.

 [b]

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