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Power Supply Connections

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Dennis Johnson

Joined: 10 Jan 2006
Posts: 89
Location: N. Calif.

Posted: Mon Aug 22, 2011 12:49 pm Post subject: Power Supply Connections

I just bought this power supply for my  hangar:

  

 http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=250852141183&ssPageName=ADME:L:OU:US:1123

  

 I will plug it into my airplane's electrical system  whenever I'm in the hangar and running the instrument panel, such as when  updating the navigation database or running the "glass cockpit" in simulator  mode for practice.  I'll also use it occasionally to top off the  battery.  I'll plug it into a 120VAC wall outlet and it will supply 12VDC  (adjustable from 10.8 to 13.2 VDC).

  

 If you zoom in on the photo at the left on the above link,  or scroll down on that page, you'll see that it has seven screw terminals for  wire connections, labeled as follows:

  

 "L"       Is this the AC  line in?

 "N"        The other AC line  in?

 The ground symbol; the ground if I use a three wire AC  cord?

 "-V"      Probably DC volts  out, minus?

 "-V"      A duplicate of the previous  one?

 "+V"     Probably DC volts out,  positive?

 "+V"     A duplicate of the previous  one?

  

 It came with absolutely no documentation or instructions  and I'm not 100% certain how to hook it up.  I emailed the vendor, who is  in China, who has not responded.

  

 I measured a few mega ohms between the L and N  terminals.  There are a few tenths of an ohm between the two -V  terminals.  Same between each of the two +V terminals.   

  

 Are my guesses above reasonable?  I only have $15  into this, including shipping, so it won't be the end of the world if I  destroy it hooking it up wrong, but I'd just as soon not.  

  

 Dennis 

  

  

   [quote][b]

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Mike Welch

Joined: 13 Feb 2011
Posts: 272

Posted: Mon Aug 22, 2011 2:02 pm Post subject: Power Supply Connections

Hi Dennis,



  Nice looking, practical power supply.  While we wait on our seasoned electrical gurus to check in, here's what I'll bet

you'll see.

  The L-N-G screws expect you to use a three wire cord, NOT a two wire.  Line, neutral, ground.  Easy enough.

  First, I'd get that cord hooked up and plug it in to 110V AC.  Then,  take your multimeter, I'll bet you have two sources of 

pos & neg 12V DC sets of screws.  Find out which ones does what.

  Attach your "positive" multimeter lead to one  "+ screw", then see if BOTH  negative screws give you 12V, which would 

tell you they have a common ground. (it probably does)

Your answer as to how it functions will be whether or not those two "+" terminals are distinctly separate

12V DC power leads.

Mike Welch



On Aug 22, 2011, at 3:43 PM, Dennis Johnson wrote:

 	  Quote: 	
		  I just bought this power supply for my hangar:

 

http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=250852141183&ssPageName=ADME:L:OU:US:1123

 

I will plug it into my airplane's electrical system whenever I'm in the hangar and running the instrument panel, such as when updating the navigation database or running the "glass cockpit" in simulator mode for practice.  I'll also use it occasionally to top off the battery.  I'll plug it into a 120VAC wall outlet and it will supply 12VDC (adjustable from 10.8 to 13.2 VDC).

 

If you zoom in on the photo at the left on the above link, or scroll down on that page, you'll see that it has seven screw terminals for wire connections, labeled as follows:

 

"L"       Is this the AC line in?

"N"        The other AC line in?

The ground symbol; the ground if I use a three wire AC cord?

"-V"      Probably DC volts out, minus?

"-V"      A duplicate of the previous one?

"+V"     Probably DC volts out, positive?

"+V"     A duplicate of the previous one?

 

It came with absolutely no documentation or instructions and I'm not 100% certain how to hook it up.  I emailed the vendor, who is in China, who has not responded.

 

I measured a few mega ohms between the L and N terminals.  There are a few tenths of an ohm between the two -V terminals.  Same between each of the two +V terminals. 

 

Are my guesses above reasonable?  I only have $15 into this, including shipping, so it won't be the end of the world if I destroy it hooking it up wrong, but I'd just as soon not. 

 

Dennis 

 

 

 	  Quote: 	
		  



href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matronics.com/Navigator?AeroElectric-List

href="http://forums.matronics.com">http://forums.matronics.com

href="http://www.matronics.com/contribution">http://www.matronics.com/contribution



	


	


 [quote][b]

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Allen Fulmer

Joined: 10 Jan 2006
Posts: 79
Location: Alexander City, AL

Posted: Mon Aug 22, 2011 2:17 pm Post subject: Power Supply Connections

I have the exact same thing and will wire it up the way you have described.  Except remember that the “N” stands for Neutral and is usually grounded at the breaker box and usually the white wire.  The black would go from the breaker to the “L(ine)” connection.  Ground is usually Green.  So while “N” is “the other AC Line in” they are not the same and you will get fireworks if you hook them up backwards.

 

You may already know this so pardon the explanation if not necessary.

 

Allen Fulmer

RV7 working on cowling

 

From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Dennis Johnson

Sent: Monday, August 22, 2011 3:43 PM

To: aeroelectric-list(at)matronics.com

Subject: Power Supply Connections

 

I just bought this power supply for my hangar:



 



http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=250852141183&ssPageName=ADME:L:OU:US:1123



 



I will plug it into my airplane's electrical system whenever I'm in the hangar and running the instrument panel, such as when updating the navigation database or running the "glass cockpit" in simulator mode for practice.  I'll also use it occasionally to top off the battery.  I'll plug it into a 120VAC wall outlet and it will supply 12VDC (adjustable from 10.8 to 13.2 VDC).



 



If you zoom in on the photo at the left on the above link, or scroll down on that page, you'll see that it has seven screw terminals for wire connections, labeled as follows:



 



"L"       Is this the AC line in?



"N"        The other AC line in?



The ground symbol; the ground if I use a three wire AC cord?



"-V"      Probably DC volts out, minus?



"-V"      A duplicate of the previous one?



"+V"     Probably DC volts out, positive?



"+V"     A duplicate of the previous one?



 



It came with absolutely no documentation or instructions and I'm not 100% certain how to hook it up.  I emailed the vendor, who is in China, who has not responded.



 



I measured a few mega ohms between the L and N terminals.  There are a few tenths of an ohm between the two -V terminals.  Same between each of the two +V terminals.  



 



Are my guesses above reasonable?  I only have $15 into this, including shipping, so it won't be the end of the world if I destroy it hooking it up wrong, but I'd just as soon not.  



 



Dennis 



 



 

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  [quote][b]

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_________________
RV7 QB Fuselage
Eggenfellner H6 on orde
N808AF reserved
Alexander City, AL

raymondj(at)frontiernet.n
Guest

Posted: Mon Aug 22, 2011 2:39 pm Post subject: Power Supply Connections

do not archive



FWIW



I recall hearing that some types of power supplies are unhappy unless 

there is some load on them.  Don't remember what type.  May not apply 

here at all or may not even be true. Don't want that smoke to get out. 



Raymond Julian

Kettle River, MN



"And you know that I could have me a million more friends,

and all I'd have to lose is my point of view." - John Prine



On 08/22/2011 05:16 PM, Allen Fulmer wrote:

 	  Quote: 	
		   I have the exact same thing and will wire it up the way you have

 described. Except remember that the “N” stands for Neutral and is

 usually grounded at the breaker box and usually the white wire. The

 black would go from the breaker to the “L(ine)” connection. Ground is

 usually Green. So while “N” is “the other AC Line in” they are not the

 same and you will get fireworks if you hook them up backwards.



 You may already know this so pardon the explanation if not necessary.



 Allen Fulmer



 RV7 working on cowling



 *From:*owner-aeroelectric-list-server(at)matronics.com

 [mailto:owner-aeroelectric-list-server(at)matronics.com] *On Behalf Of

 *Dennis Johnson

 *Sent:* Monday, August 22, 2011 3:43 PM

 *To:* aeroelectric-list(at)matronics.com

 *Subject:* Power Supply Connections



 I just bought this power supply for my hangar:



 http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=250852141183&ssPageName=ADME:L:OU:US:1123

 <http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=250852141183&ssPageName=ADME:L:OU:US:1123>



 I will plug it into my airplane's electrical system whenever I'm in the

 hangar and running the instrument panel, such as when updating the

 navigation database or running the "glass cockpit" in simulator mode for

 practice. I'll also use it occasionally to top off the battery. I'll

 plug it into a 120VAC wall outlet and it will supply 12VDC (adjustable

 from 10.8 to 13.2 VDC).



 If you zoom in on the photo at the left on the above link, or scroll

 down on that page, you'll see that it has seven screw terminals for wire

 connections, labeled as follows:



 "L" Is this the AC line in?



 "N" The other AC line in?



 The ground symbol; the ground if I use a three wire AC cord?



 "-V" Probably DC volts out, minus?



 "-V" A duplicate of the previous one?



 "+V" Probably DC volts out, positive?



 "+V" A duplicate of the previous one?



 It came with absolutely no documentation or instructions and I'm not

 100% certain how to hook it up. I emailed the vendor, who is in China,

 who has not responded.



 I measured a few mega ohms between the L and N terminals. There are a

 few tenths of an ohm between the two -V terminals. Same between each of

 the two +V terminals.



 Are my guesses above reasonable? I only have $15 into this, including

 shipping, so it won't be the end of the world if I destroy it hooking it

 up wrong, but I'd just as soon not.



 Dennis



 *  *



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 *http://www.matronics.com/Navigator?AeroElectric-List*



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 *http://forums.matronics.com*



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 *http://www.matronics.com/contribution*



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Dennis Johnson

Joined: 10 Jan 2006
Posts: 89
Location: N. Calif.

Posted: Mon Aug 22, 2011 7:29 pm Post subject: Re: Power Supply Connections

Thanks for the speedy and helpful answers!  I'll hook it up within a few days and report back.



Thanks,

Dennis



do not archive

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nuckolls.bob(at)aeroelect
Guest

Posted: Tue Aug 23, 2011 6:47 am Post subject: Power Supply Connections

At 03:43 PM 8/22/2011, you wrote:

  	  Quote: 	
		  I just bought this power supply for my hangar:

  

   http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=250852141183&ssPageName=ADME:L:OU:US:1123 

  

 I will plug it into my airplane's electrical system whenever I'm in the hangar and running the instrument panel, such as when updating the navigation database or running the "glass cockpit" in simulator mode for practice.  I'll also use it occasionally to top off the battery.  I'll plug it into a 120VAC wall outlet and it will supply 12VDC (as

 adjustable from 10.8 to 13.2 VDC). 	


    The availability of capable switch-mode power supplies

    on eBay has really expanded over the past few years. The

    $value$ has climbed steadily too. For a short period of time

    about 7 years ago, the 'Connection offered a 25A, 13.8v

    power supply for $125 . . . a good value at the time but

    now one can acquire more output for less dollars. A good

    example can be seen here:



  http://tinyurl.com/3kx6rvc 



    These are not necessarily plug-in-play devices for powering

    up your airplane on the ground . . . but they're close.



    Some products caution against using them to 'charge a battery'.

    It's not because the supply might be damaged by such a task,

    it has to do with the BACKFLOW of current into a power supply

    that is deprived of AC mains power while still connected to the

    battery. I have a couple of exemplar supplies on my bench going

    into a project for a customer. These are 28v, 15A supplies and

    I'm using them to charge small batteries. Reverse current into

    a powered down supply is about 50 milliamps. This backflow would

    ultimately discharge a battery. Also, without a schematic to study,

    I'm not 100% sure that this backflow would not damage the power

    supply. I'm wiring Schottky diodes in series with the supplies

    to prevent this condition.



    Keep in mind to that a "12-volt" power supply will run your

    ship's accessories, it takes at least 14.0 volts to top

    off a battery. Adding 0.5 volts of drop in the isolation diode

    and you'll find that your supply needs to be rated for 14.5

    volts of output. One might consider a relay in series with the

    supply's output that is powered from the same 120vac source

    that energizes the power supply. If power is removed . . . or

    fails while you're not around to deal with it . . . the relay

    will drop out and effect an automatic disconnect.



    A relay would be a good companion to the power supply linked

    above . . . a diode would work well with a power supply rated

    at 15 volts. In fact, the power supply cited above can be

    adjusted to offset the small voltage across a heat-sink mounted

    diode.



    At 36 Amps, $67 and free shipping, this device is an exceptional

    value.



 

 

   Bob . . .    [quote][b]

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JOHN TIPTON

Joined: 17 Sep 2006
Posts: 239
Location: Torquay - England

Posted: Tue Aug 23, 2011 11:49 pm Post subject: Power Supply Connections

Should any such power supply to the aircraft, or  indeed any bench testing of equipment, have the battery connected

  

 John

 [quote]   ---

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wcurtis(at)nerv10.com
Guest

Posted: Mon Aug 29, 2011 12:59 pm Post subject: Power Supply Connections

Below is a link to my home 12 volt electrical system.  Hyperlinks are included to all the components.  All my various electronics components (cable modem, LAN switch, router, telephones, NAS, 12 volt CFL lights, etc) attach to this system.  Additional, I tap into it to charge/run the electrical system on my "still at the house" RV-10. 

  

 http://wcurtis.nerv10.com/house/dc/12volt.pdf

  

 It served me well this past weekend as Irene came through and power was out for about 12 hours. Before shedding load, not including lights, my devices consume about 6 amps.  The single Sears U1 battery lasted about 4 hours before I turned on the generator.

   

 I put this system in due to frequent power failures (brown-outs and black-outs) in my area.  It is cool watching all the WiFi SSIDs in your area go away and yours is the only remaining.  I did find out that the power backup on the Internet service provide is only about 6-8 hours however.

 -- 



 William

 N40237 - http://wcurtis.nerv10.com/

  



  [quote][b]

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mrspudandcompany(at)veriz
Guest

Posted: Mon Aug 29, 2011 2:20 pm Post subject: Power Supply Connections

I tap into it to charge/run the electrical system on my

"still at the house" 

		William



				Do the Feds know you have a still at your

house??  You may get a knock at the door as soon as they find out where you

live.   â˜º

				Do not archive

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