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jonlaury
Joined: 06 Nov 2006
Posts: 336
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 Posted: Wed Oct 09, 2013 8:17 am Post subject: Charge battery thru Ground Power Jack |
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One of the reasons I installed a GPJ was that I thought that I would be able to hook up my battery maintainer through it.
But when the Schumacher XC-10 is connected, there's not sufficient power to light the GP indicator lamp or close the GPG contactor.
How do I make this happen?
Thanks,
John
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user9253
Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan
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| Posted: Thu Oct 10, 2013 8:23 am Post subject: Re: Charge battery thru Ground Power Jack |
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This is a catch 22 situation. A smart battery charger will not turn on and start charging a battery unless it first sees a battery connected. And the aircraft ground power circuit will not turn on unless it first sees ground power connected.
Even if a battery maintainer was able to energize the aircraft ground power contactor, that contactor might consume all of the maintainer output. The maintainer might not have enough energy left to charge or maintain the aircraft battery.
I do not see a simple solution to this problem.
There is an error in the schematic. The wire coming out of the top of the OV module should connect to the top of contactor coil, not the bottom of the coil. Bad things could happen if wired as drawn.
Joe
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ctbecker
Joined: 14 May 2006
Posts: 9
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| Posted: Thu Oct 10, 2013 11:29 am Post subject: Charge battery thru Ground Power Jack |
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Why not have a 'manual' switch to activate the contactor
for battery mainenance?
On Wed, 9 Oct 2013 09:17:05 -0700
"jonlaury" <jonlaury(at)impulse.net> wrote:
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jonlaury
Joined: 06 Nov 2006
Posts: 336
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| Posted: Fri Oct 11, 2013 7:36 am Post subject: Re: Charge battery thru Ground Power Jack |
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| user9253 wrote: | This is a catch 22 situation. A smart battery charger will not turn on and start charging a battery unless it first sees a battery connected. And the aircraft ground power circuit will not turn on unless it first sees ground power connected.
Even if a battery maintainer was able to energize the aircraft ground power contactor, that contactor might consume all of the maintainer output. The maintainer might not have enough energy left to charge or maintain the aircraft battery.
I do not see a simple solution to this problem.
There is an error in the schematic. The wire coming out of the top of the OV module should connect to the top of contactor coil, not the bottom of the coil. Bad things could happen if wired as drawn.
Joe |
Joe, thanks for having my back on the OVM wiring. Got that corrected on the schematic.
In exploring Charles' idea of a manual switch, intuitively I thought that drawing power from the battery while trying to charge it might mess up the charging side of things. But what about attaching a 12 v wall wart supply to the positive of the GPJ to provide the necessary current to close the contactor and light the indicator lamp? Upon contactor closure, the batt maitainer would sense battery 12.5v (+/-) and supply the necessary V+ to charge the batt. The fly in the ointment that I can see is that the higher voltage of the batt would takeover the current demands of the contactor and lamp and we're back to square one. UNLESS... the charger can provide enough amperage for both contactor demand and battery demand now that the connection to the batt has been accomplished.
I think I may be chasing my tail.
John
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user9253
Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan
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| Posted: Fri Oct 11, 2013 9:18 am Post subject: Re: Charge battery thru Ground Power Jack |
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Any new switching circuit should be carefully analyzed to be sure that the reverse polarity and over-voltage protection is not defeated.
Momentarily connecting a 12 volt wall wart is worth a try, or any 12 volt external battery for that matter, to get the battery maintainer operating. Without knowing the characteristics of the battery maintainer, experimenting is required.
Consider charging the aircraft battery with a direct connection instead of using the ground power port. This charger from Walmart comes with a cord that attaches permanently to a battery. On the end of the cord is a plug that connects to another plug on the end of the battery charger cord.
http://www.walmart.com/ip/Schumacher-Automotive-SpeedCharge-Battery-Maintainer-and-Charger/13005742
The hard part is finding a place on the aircraft to mount the plug so that the charger can be plugged in without opening the cowl.
On my RV-12, I plug my battery maintainer into the always hot cigarette lighter outlet inside of the cockpit.
Joe
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