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  #21  
Old 02-15-2016, 09:17 AM
AviatorJ AviatorJ is offline
 
Join Date: Feb 2015
Location: Oklahoma City
Posts: 930
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Quote:
Originally Posted by Jesse View Post
That's what I do. I hook up the ground power plug so it is directly connected to the battery, and I've never had a problem with this. I out e grind power plug on the belly right by the battery. I make a little "dongle" with a mating connector for the Piper style plug so I can gator clip the trickle charger (battery minder) on or I can hook up jumper cables. This has come it handy on numerous occasions. I can also hook up a Shumacher style charger for working on avionics on the ground.
Jesse that sounds really interesting. Do you have any pictures or drawings of how this is all put together? To me it sounds like you have some larger gauge wire connected directly to the batter terminals and terminated on one of those piper style plugs.

When I installed the dongle on the 172 I just used a common ground and put the positive on the master relay I assume to protect the battery.
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  #22  
Old 02-15-2016, 09:50 AM
Flyingleap Flyingleap is offline
 
Join Date: Nov 2012
Location: Cincinnati,Ohio KHAO
Posts: 129
Default 24V protection?

I have a Cherokee too. I don't think there is any way to protect the power plug input for a 24V. power cart. It pulls the relay, the diode to the master pulls the external relay, 24V applid externally will blow the battery/system if master is on. But, if 12V is applied externally, it is a safe system. Can't charge externally though.

Maybe I ought to go look at the schematic again.....it's been awhile...
John
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  #23  
Old 02-15-2016, 11:14 AM
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Jesse Jesse is offline
 
Join Date: May 2005
Location: X35 - Ocala, FL
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Quote:
Originally Posted by AviatorJ View Post
Jesse that sounds really interesting. Do you have any pictures or drawings of how this is all put together? To me it sounds like you have some larger gauge wire connected directly to the batter terminals and terminated on one of those piper style plugs.

When I installed the dongle on the 172 I just used a common ground and put the positive on the master relay I assume to protect the battery.
That's all based on the charger used, just as if the rear baggage wall was off and you had a charger hooked up to the battery. I prefer the Battery Minder that will charge up to 8 amps, but will top off the battery and go into maintenance mode automatically. They have units that are specifically calibrated for Concorde, Odyssey, Gill, etc. they also have 12 and 24 volt chargers.

The Shumacher type charger I will use when I am in the plane, but I never leave it connected overnight. They also will somewhat smart charge, only putting out what they need to put out to maintain the voltage, but I still don't use them overnight. I also never use a setting over 10 amps.
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  #24  
Old 02-15-2016, 02:07 PM
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RV10Rob RV10Rob is offline
 
Join Date: Mar 2007
Location: Woodinville, WA
Posts: 533
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For what it's worth regarding trickle charging/battery tender, the Concorde RG-25XC I bought in 2010 and first flew in 2011 is still going strong--never needed a charger, even sometimes going several weeks between flights. I use the cigarette lighter in the panel and a 10A power supply to run the panel for software updates, etc, and it also can feed the battery when the master switch is on.

-Rob
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  #25  
Old 02-15-2016, 02:38 PM
BillFear BillFear is offline
 
Join Date: Oct 2007
Location: Sherrills Ford, NC (Lake norman area)
Posts: 432
Default Take a look at these connectors

Quote:
Originally Posted by Jesse View Post
That's what I do. I hook up the ground power plug so it is directly connected to the battery, and I've never had a problem with this. I out e grind power plug on the belly right by the battery. I make a little "dongle" with a mating connector for the Piper style plug so I can gator clip the trickle charger (battery minder) on or I can hook up jumper cables. This has come it handy on numerous occasions. I can also hook up a Shumacher style charger for working on avionics on the ground.
Our battery is on the firewall, so the best option for us was to put the charge/jump plug inside the oil door. I found these anderson connectors that are much smaller than the piper or cessna plug, plug they isolate the power line very nicely. I used high quality welder cable to run it over the battery and ground. Used the extra welder cable to make a ground plug that we carry in the plane with open pigtails, that way we can use any charger or battery to charge and even jump in an emergency.

http://www.andersonpower.com/_global...f/ds-sb120.pdf
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  #26  
Old 02-15-2016, 08:19 PM
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hutchieboy hutchieboy is offline
 
Join Date: Sep 2015
Location: Waxhaw, NC
Posts: 1
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http://www.powerlet.com/product/tank...ector-only/286

another option for battery tender hookups, externally perhaps
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  #27  
Old 02-15-2016, 10:10 PM
MikeS MikeS is offline
 
Join Date: Aug 2006
Posts: 77
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> "The Shumacher type charger I will use when I am in the plane, but I never leave it connected overnight. They also will somewhat smart charge, only putting out what they need to put out to maintain the voltage, . . ."

If you've put a voltmeter on that "Shumacher type" charger to see just what voltage it's putting out when in its "somewhat smart charge" mode, then you know what it's doing and may have reason not to distrust them as much as I do. I've really only monitored two Schumachers when in "maintainer mode" so I'm not wise enough to condemn them all, but I sure would be suspicious

The battery specialist I bought my most recent AGM from was horrified at the mere mention of using an ordinary charger with "maintainer mode" on a battery. It was thanks to him that I actually put a voltmeter on the Schumacher car charger I'd bought at Sears and saw what it was putting out when selected for "maintainer mode." It was over 15 volts continuous.

It was about the same time that I got involved with helping my hangar neighbor and saw his table full of ruined batteries in the back of the hangar. He had been using a small Schumacher model (picture attached). I put a voltmeter on it and sure enough, same thing. He had been very diligent in using it, thinking that in keeping his battery connected to this device he was prolonging the life of his batteries - despite the fact he had a table full of ruined ones. He's 87 but had obviously been unable to put two and two together for many years.

*******

Well, guess I can't post a picture. It's a small nice-looking little thing that says Schumacher Speed Charge on the front.
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  #28  
Old 02-16-2016, 05:27 AM
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Jesse Jesse is offline
 
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Location: X35 - Ocala, FL
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Don't get me wrong. I never leave that type of charger connected. I will only use it at all to keep battery voltage up when running the panel on the ground. The voltage in this mode never reaches anywhere close to the 14.3 or so that I get when running the alternator. Usually it just keeps me in the 12.7-8 range so I don't drain my battery.
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  #29  
Old 02-16-2016, 08:55 AM
rocketman1988 rocketman1988 is offline
 
Join Date: Jun 2010
Location: Sunman, IN
Posts: 2,340
Default Another perspective...

I have been following this thread with interest. I have been using battery tenders on all of my equipment for years and have never had ANY issues with damaging batteries. I use the tenders on tractors (lead acid), snowmobiles (lead acid), ATVs (AGM), Ultralights (AGM), and a Cessna 172 (AGM). During the winter months the tenders are left connected; summer months, not so much. The tenders on the AGM batteries are the plus model, rated for AGM type batteries. I have yet to have to replace the tractor battery (10 years), the snowmobile batteries usually last 3-5 years and the last battery I replaced in the Cessna was 7 years old. Can't vouch for the Schumacher brand by I have had good luck with battery tender brand...obviously YMMV...
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  #30  
Old 02-16-2016, 09:25 AM
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9GT 9GT is offline
 
Join Date: Jan 2010
Location: Southern Michigan
Posts: 2,074
Default For Jump Starting

I fabricated up a jump start plug for under $30 that I carry in my tool box in the plane. Instead of soldering in a set of cables, I soldered in some aluminum tubing that extends out about 3" at angles to get separation. Its pretty easy to find someone with a set of jumpers willing to help you out if there's no FBO services around.
http://www.skygeek.com/aeronautical-...ower-plug.html
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