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  #1  
Old 01-11-2012, 11:41 AM
kai kai is offline
 
Join Date: May 2011
Location: Berlin, Germany
Posts: 84
Default External Power - Wiring

Hi,

I?m just thinking about how to wire the external power.

One Idea is to install a relay which is powered by the external power and connects the ext power directly to the battery bus. Very simple.

The Other is, to install a second smaller relay, which disconnects the BAT Relay when ext Power is connected. So that the BAT is not connected when ext Power is online. I want to prevent the BAT of any damages (fire...).

How have others done that? Did you install a current limiter, relays, diodes?

Thanks for Ideas,

Kai.
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  #2  
Old 01-11-2012, 11:47 AM
Mike S's Avatar
Mike S Mike S is offline
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,705
Default

Are you looking to recharge or maintain a battery, or you looking to jump start a dead battery.

Wiring and all will be different.

I have a maintain/charge setup, wires go directly to the batteries.

Plug pigtails are in the baggage compartment.
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Flying as of 12/4/2010

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  #3  
Old 01-11-2012, 11:57 AM
aerhed aerhed is offline
 
Join Date: Dec 2008
Location: Big Sandy, WY
Posts: 2,567
Default

The most common certified setup is the flat 3 pin plug with one short pin. The short pin closes a current protected relay directly to the battery after the pos/neg pins are seated. Some cessnas allow power to the bus regardless of master switch position due to where the ext power cables are connected. I'd prefer the connections on the bat side so the bus is isolated unless the master is on. I'm not really advocating the big plug, just 'splainin' it.
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  #4  
Old 01-11-2012, 12:55 PM
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Fred.Stucklen Fred.Stucklen is offline
 
Join Date: Oct 2006
Location: Brooksville, FL
Posts: 378
Default External Power - Wiring

I put a Piper Power plug on the belly of my planes wired always hot into the on-board battery. Allows for recharging the on-boad battery and/or running the avionics while in the hanger......


Quote:
Originally Posted by kai View Post
Hi,

I?m just thinking about how to wire the external power.

One Idea is to install a relay which is powered by the external power and connects the ext power directly to the battery bus. Very simple.

The Other is, to install a second smaller relay, which disconnects the BAT Relay when ext Power is connected. So that the BAT is not connected when ext Power is online. I want to prevent the BAT of any damages (fire...).

How have others done that? Did you install a current limiter, relays, diodes?

Thanks for Ideas,

Kai.
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RV-7A N924RV Flying (1865 Hrs & counting)
RV-6A N926RV 875 Hrs (Sold)
RV-6A N925RV 2008 Hrs (Sold)
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  #5  
Old 01-11-2012, 01:27 PM
Bob'sRV6A Bob'sRV6A is offline
 
Join Date: Jun 2009
Location: Arroyo Grande, CA
Posts: 227
Default ground power recepticle

I think I will install Bob Nuckolls version found at: http://www.aeroelectric.com/articles/grndpwr.pdf
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  #6  
Old 01-11-2012, 07:12 PM
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vlittle vlittle is offline
 
Join Date: Jan 2005
Location: Victoria, Canada
Posts: 2,277
Default

You may wish to reconsider.

A ground power jack appears to be a good idea until you look at the advantages/disadvantages.

Advantages are that you can jump-start your aircraft from a GPU. Don't expect a GPU to charge your main battery, because it's not designed to do so and won't be hooked up for very long.

Jumpstarting your aircraft means that your alternator will be responsible for charging your nearly flat battery, and this is very hard on the alternator.

The GPU may be 28V, which means disaster unless you follow Bob Nuckoll's circuit with overvoltage and polarity protection.

Finally, you are carrying a lot of dead weight around for the occassional non-emergy situation that requires a jump start.

I suggest something similar: a charging jack with a 10 amp current limiter. You can hook up a battery charger to this port (cigar lighter plug for example) and charge your battery properly. In a pinch, you can hook up jumper cables to this port (with an adapter) and a running vehicle that will charge your battery enough in a few minutes to allow a start.

10 amps should be enough to power up some basic avionics for testing if that's what you need to do.

Finally, you can even wire in a small battery charger that runs off of 120VAC and if you have a flat battery, you just need to find a plug in somewhere.

Food for thought.
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  #7  
Old 01-11-2012, 09:20 PM
Wayne Gillispie Wayne Gillispie is offline
 
Join Date: Apr 2009
Location: USA
Posts: 1,499
Arrow

I did just like Mike and Vern. Cig lighter charge ports/power for kids stuff on both main 925 and aux 680 bat. 15A fuse. I use 12A Odyssey chgr. I also connected a spare bat to aux port for avionics setup. I could play for 6-8 hrs on three batteries.

If I run my aux bat down to 11.5 ocv then start with main bat, my alt current goes to 55-60A while powering strobes and recharging batteries. Think what the current would be with a dead battery.
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  #8  
Old 01-11-2012, 09:53 PM
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vmirv8bldr vmirv8bldr is offline
 
Join Date: Jun 2005
Location: Eastvale, CA
Posts: 378
Default Aeroelectric

I installed the Bob Nuckoll's in a recessed box adjacent to my battery (rear-mounted.) It is connected to a self-powered contactor that connects to the main battery contactor and incidentally the battery terminal. The switch/breaker is up front. It is a component of Bob's design. It uses the overvoltage protection to prevent the inevitable 28V SNAFU. An illuminated light lets me know power is connected, whether or not the contactor is closed.

All in all, it took probably 40-60 hours to design, build, and install the recessed box, wiring, etc.

I can hook power to it with no battery and turn everything on, I can jump the plane through it, or I can charge the battery through it.

Was it worth it? Can't say, but it sure is handy. So far about half the people who have seen it say they wish they had something like that. GPU or not, I can jump from any car, which is generally pretty easy to come by. If the battery is dead, just like a car, hook the cables up and leave it for a few minutes. I turn on the EIS and monitor the voltage though.
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  #9  
Old 01-12-2012, 09:58 AM
kai kai is offline
 
Join Date: May 2011
Location: Berlin, Germany
Posts: 84
Default

Thanks to all for the Bunch of Ideas, I have to think about every possibility.

Thanks a lot,

kai.
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  #10  
Old 01-12-2012, 01:18 PM
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pierre smith pierre smith is offline
 
Join Date: Jan 2005
Location: Louisville, Ga
Posts: 7,885
Default Check Aircraft Spruce

I added a jumper plug to the -10 last year, in case I forgot the master and needed a jump. At the same time, we wired in the plugs for a neat battery-minder from ACS that has a temperature sensor built in as well, to avoid battery fires...taylor made for leaving it plugged in continually:

http://www.aircraftspruce.com/catalo...er11-02006.php

Best,
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