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egilroy(at)gmail.com
Guest

Posted: Wed Oct 20, 2010 12:48 pm Post subject: Ground Power / Tiedown Power Cart

Here's a subject I have not seen discussed, as of yet, on the list or in Bob's Aero-Electric Connection:

We would like to construct a 12 volt, 24 volt, and 110 volt ground power cart for powering electrical tools, etc. and for jumping our club airplanes during the winters here in the wilds of Jersey. We have non-electrified outdoor tiedown spots. 



It would seem (2) 12 volt automotive batteries in series would be inexpensive and we would keep them charged via simple 12v solar chargers mounted on top of our storage shed. The 24V charging/inverting devices are hundreds of dollars.

 



So how might such a circuit look to "isolate" the batteries for 12 volt charging and occasional 120v inverter usage from the 12v side and still allow on-demand 24/28V "jumping"?

 



My thinking says manually isolate the 24v series circuit until I want to "jump" and just throw a switch to go 24v with everything else physically disconnected. Or is there a more elegant solution?  Idiot proof would be best, remember these are pilots !!!

 



I have thought about this for some months but see no simple solution to provide this "isolation" function but then I am a BSCS, not an EE. 

Thanks... Ed

  [quote][b]

Ivor Phillips

Joined: 16 Jan 2006
Posts: 253
Location: London UK

Posted: Wed Oct 20, 2010 11:15 pm Post subject: Ground Power / Tiedown Power Cart

Hi 

I am using a 12volt battery pack with built in inverter but my system is only 12v, 

  

http://www.northerntooluk.com/automotive-equipment/battery-chargers-and-cables/400w-emergency-power-source_2354E.html  

  

But it shouldn’t be too difficult to use two together for your 24v starts, it also come’s with LED light and tyre pump, 

Just a idea! 

  

Ivor



 On 20 October 2010 21:44, Ed Gilroy <egilroy(at)gmail.com (egilroy(at)gmail.com)> wrote:

 [quote] Here's a subject I have not seen discussed, as of yet, on the list or in Bob's Aero-Electric Connection:

 



We would like to construct a 12 volt, 24 volt, and 110 volt ground power cart for powering electrical tools, etc. and for jumping our club airplanes during the winters here in the wilds of Jersey. We have non-electrified outdoor tiedown spots.  



 It would seem (2) 12 volt automotive batteries in series would be inexpensive and we would keep them charged via simple 12v solar chargers mounted on top of our storage shed. The 24V charging/inverting devices are hundreds of dollars.

  



 So how might such a circuit look to "isolate" the batteries for 12 volt charging and occasional 120v inverter usage from the 12v side and still allow on-demand 24/28V "jumping"?

 



 My thinking says manually isolate the 24v series circuit until I want to "jump" and just throw a switch to go 24v with everything else physically disconnected. Or is there a more elegant solution?  Idiot proof would be best, remember these are pilots !!!

  



 I have thought about this for some months but see no simple solution to provide this "isolation" function but then I am a BSCS, not an EE. 

 



 Thanks... Ed

 	  Quote: 	
		  



ist" target="_blank">http://www.matronics.com/Navigator?AeroElectric-List

ttp://forums.matronics.com

_blank">http://www.matronics.com/contribution



	
[b]

user9253

Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan

Posted: Thu Oct 21, 2010 5:40 am Post subject: Re: Ground Power / Tiedown Power Cart

No matter how fool proof you make a dual voltage cart, it is only a matter of time before someone uses the wrong voltage on their plane.  The damage caused will be much greater than the cost of a second cart.  So I suggest having two carts, one for 12 volt and one for 24 volt.  The carts can be clearly marked.  And it should be obvious that the cart with two batteries if for 24 volts.  Or how about just having one cart for 12 volts to take care of the majority of aircraft.  For the infrequent occasions when 24 volts are required, a spare battery can be connected in series.

Joe

_________________
Joe Gores

ulflyer(at)verizon.net
Guest

Posted: Thu Oct 21, 2010 9:07 pm Post subject: Ground Power / Tiedown Power Cart

There are some golf cart batteries that work better for solar 

charging and can supply a good amount of current for jumping or 

running inverters.  If I recall right cast was around $70 each if I 

recall right.  If your interested I will ping my friend for info on 

them.  There being used by folks living off the grid.  A lot of folks 

are moving to isolated areas in preparation for the coming melt down.

jerb



At 03:44 PM 10/20/2010, you wrote:

 	  Quote: 	
		  Here's a subject I have not seen discussed, as of yet, on the list 

or in Bob's Aero-Electric Connection:



We would like to construct a 12 volt, 24 volt, and 110 volt ground 

power cart for powering electrical tools, etc. and for jumping our 

club airplanes during the winters here in the wilds of Jersey. We 

have non-electrified outdoor tiedown spots.



It would seem (2) 12 volt automotive batteries in series would be 

inexpensive and we would keep them charged via simple 12v solar 

chargers mounted on top of our storage shed. The 24V 

charging/inverting devices are hundreds of dollars.



So how might such a circuit look to "isolate" the batteries for 12 

volt charging and occasional 120v inverter usage from the 12v side 

and still allow on-demand 24/28V "jumping"?



My thinking says manually isolate the 24v series circuit until I 

want to "jump" and just throw a switch to go 24v with everything 

else physically disconnected. Or is there a more elegant 

solution?  Idiot proof would be best, remember these are pilots !!!



I have thought about this for some months but see no simple solution 

to provide this "isolation" function but then I am a BSCS, not an EE.



Thanks... Ed

Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Sat Oct 23, 2010 5:40 pm Post subject: Ground Power / Tiedown Power Cart

I hope this little diagram I just drew will help you.  Just be sure to close the SPDT switch in the 12V position before charging.  The drawing is for two sets of 12 V batteries wired into two sets of 12V. For this set up I would try to get batteries of matching amperage.  You can add as many batteries as you want but I was thinking that four automotive storage batteries would be heavy enough for carting around.  

   

Noel  

     

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

 Sent: October 20, 2010 6:14 PM

 To: aeroelectric-list(at)matronics.com

 Subject: Ground Power / Tiedown Power Cart  

  

     

Here's a subject I have not seen discussed, as of yet, on the list or in Bob's Aero-Electric Connection:  

    

   

  

We would like to construct a 12 volt, 24 volt, and 110 volt ground power cart for powering electrical tools, etc. and for jumping our club airplanes during the winters here in the wilds of Jersey. We have non-electrified outdoor tiedown spots.    

   

    

It would seem (2) 12 volt automotive batteries in series would be inexpensive and we would keep them charged via simple 12v solar chargers mounted on top of our storage shed. The 24V charging/inverting devices are hundreds of dollars.  

    

   

    

So how might such a circuit look to "isolate" the batteries for 12 volt charging and occasional 120v inverter usage from the 12v side and still allow on-demand 24/28V "jumping"?  

    

   

    

My thinking says manually isolate the 24v series circuit until I want to "jump" and just throw a switch to go 24v with everything else physically disconnected. Or is there a more elegant solution?  Idiot proof would be best, remember these are pilots !!!  

    

   

    

I have thought about this for some months but see no simple solution to provide this "isolation" function but then I am a BSCS, not an EE.   

    

   

    

Thanks... Ed  

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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

nuckolls.bob(at)aeroelect
Guest

Posted: Sat Oct 23, 2010 8:52 pm Post subject: Ground Power / Tiedown Power Cart

Subject: Ground Power / Tiedown Power Cart

  

 Here's a subject I have not seen discussed, as of yet, on the list or in Bob's Aero-Electric Connection:

  

 We would like to construct a 12 volt, 24 volt, and 110 volt ground power cart for powering electrical tools, etc. and for jumping our club airplanes during the winters here in the wilds of Jersey. We have non-electrified outdoor tiedown spots.

  

 It would seem (2) 12 volt automotive batteries in series would be inexpensive and we would keep them charged via simple 12v solar chargers mounted on top of our storage shed. The 24V charging/inverting devices are hundreds of dollars.

  

 So how might such a circuit look to "isolate" the batteries for 12 volt charging and occasional 120v inverter usage from the 12v side and still allow on-demand 24/28V "jumping"?

  

 My thinking says manually isolate the 24v series circuit until I want to "jump" and just throw a switch to go 24v with everything else physically disconnected. Or is there a more elegant solution?  Idiot proof would be best, remember these are pilots !!!

  

 I have thought about this for some months but see no simple solution to provide this "isolation" function but then I am a BSCS, not an EE. 

  

 Thanks... Ed



     I've had occasion to observer or participate in the

     fabrication of several battery carts over the years.

     Functionally, it's not a big deal except for that

     pesky DPDT switch that has to carry many hundreds

     of amps. You can synthesize the switch from an array

     of contactors but there is risk for shorting out one

     of the batteries if a contactor sticks.



     The simplest and least risky 12/24 switching involved

     changing some jumpers around on a sort of "stud panel"

     where the jumpers were brass bars held on threaded

     studs with large hand operated "nuts" . . . but

     the loose bars and exposed studs offered some slight

     risk of shorts . . . about he same degree of risk

     as for swinging wrenches on car battery (+) terminals.



     I've been pondering a design for a jumper bar assembly

     where the bars are sandwiched between two sheets

     of insulating material. The spacing of the studs

     is such that the array cannot be installed in any

     way except one that produces the 12/24 configuration.



     I'll publish the drawings in a day or so. Had them

     about done tonight but had to halt operations

     long enough to restore a c-drive.



     Bob . . .



     I've been pondering a variation on that idea 



 



 

   Bob . . .    [quote][b]

raymondj(at)frontiernet.n
Guest

Posted: Sat Oct 23, 2010 9:24 pm Post subject: Ground Power / Tiedown Power Cart

Bob,



A thought on the battery cart.  I have a tig welder that has jumpers for 

various settings that used welding cable with male ends on it as 

jumpers.  The females are mounted in a panel and the only time there 

might be an exposed connector would be if someone left a jumper end 

dangling.



FWIW



Raymond Julian

Kettle River, MN



On 10/23/2010 11:50 PM, Robert L. Nuckolls, III wrote:

 	  Quote: 	
		   *Subject: Ground Power / Tiedown Power Cart



 Here's a subject I have not seen discussed, as of yet, on the list or in

 Bob's Aero-Electric Connection:



 We would like to construct a 12 volt, 24 volt, and 110 volt ground power

 cart for powering electrical tools, etc. and for jumping our club

 airplanes during the winters here in the wilds of Jersey. We have

 non-electrified outdoor tiedown spots.



 It would seem (2) 12 volt automotive batteries in series would be

 inexpensive and we would keep them charged via simple 12v solar chargers

 mounted on top of our storage shed. The 24V charging/inverting devices

 are hundreds of dollars.



 So how might such a circuit look to "isolate" the batteries for 12 volt

 charging and occasional 120v inverter usage from the 12v side and still

 allow on-demand 24/28V "jumping"?



 My thinking says manually isolate the 24v series circuit until I want to

 "jump" and just throw a switch to go 24v with everything else physically

 disconnected. Or is there a more elegant solution? Idiot proof would be

 best, remember these are pilots !!!



 I have thought about this for some months but see no simple solution to

 provide this "isolation" function but then I am a BSCS, not an EE.



 Thanks... Ed



 * I've had occasion to observer or participate in the

 fabrication of several battery carts over the years.

 Functionally, it's not a big deal except for that

 pesky DPDT switch that has to carry many hundreds

 of amps. You can synthesize the switch from an array

 of contactors but there is risk for shorting out one

 of the batteries if a contactor sticks.



 The simplest and least risky 12/24 switching involved

 changing some jumpers around on a sort of "stud panel"

 where the jumpers were brass bars held on threaded

 studs with large hand operated "nuts" . . . but

 the loose bars and exposed studs offered some slight

 risk of shorts . . . about he same degree of risk

 as for swinging wrenches on car battery (+) terminals.



 I've been pondering a design for a jumper bar assembly

 where the bars are sandwiched between two sheets

 of insulating material. The spacing of the studs

 is such that the array cannot be installed in any

 way except one that produces the 12/24 configuration.



 I'll publish the drawings in a day or so. Had them

 about done tonight but had to halt operations

 long enough to restore a c-drive.



 Bob . . .



 I've been pondering a variation on that idea



 Bob . . .



 *

 *

nuckolls.bob(at)aeroelect
Guest

Posted: Sat Oct 23, 2010 10:05 pm Post subject: Ground Power / Tiedown Power Cart

At 12:18 AM 10/24/2010, you wrote:

 	  Quote: 	
		  



Bob,



A thought on the battery cart.  I have a tig welder that has jumpers 

for various settings that used welding cable with male ends on it as 

jumpers.  The females are mounted in a panel and the only time there 

might be an exposed connector would be if someone left a jumper end dangling.


	


   Yeah . . . I considered that kind of device. They're pretty

   pricey. Take a look at the hammer-n-tongs approach and see

   what you think.

   Bob . . .

aerobubba(at)earthlink.ne
Guest

Posted: Sun Oct 24, 2010 5:17 am Post subject: Ground Power / Tiedown Power Cart

HI All-



A couple observations-



You've got me thinking about a gadget for the chapter.  The first thing

that comes to mind is to substitute cheap AGM batteries from Batteries Plus

(or wherever) for the car batteries.  They'd be cheaper, lighter, and dump

current better than the plain flooded cell batteries.  



This leads to the thought of using cast off batteries from Bob's

one-each-year-or-two battery replacement scheme, especially since that's

what I'll be doing once I get flying.  If one made a cart that wasn't

physically tailored to a specific type of battery, they could use whatever

batteries were surplussed on the field. 



The last item is that another group I'm part of was given a 'cast off'

motorized scooter chair.  A ground power cord was added, and viola!  A

self-powered ground power cart that has enough energy to run the avionics

all day and yet crank a couple of really large engines repeatedly without

showing any signs of stress.  As a side bennie, the scooter came with a

tailored smart charger that can be left on continuously, making charge

state mx trivial.  The scooter has two 12v AGM's, so whatever voltage

switching arrangement were derived could be applied here as well.  Given

all the ads on the tube for 'free' mobility scooters, it seems like there

might be a significant secondary market for the things. 



FWIW-



Glen Matejcek

aerobubba(at)earthlink.net

raymondj(at)frontiernet.n
Guest

Posted: Sun Oct 24, 2010 10:00 am Post subject: Ground Power / Tiedown Power Cart

do not archive



I can't find the info Bob is directing me to.



Any help would be appreciated.



Raymond Julian

Kettle River, MN



On 10/24/2010 01:03 AM, Robert L. Nuckolls, III wrote:

 	  Quote: 	
		   

 <nuckolls.bob(at)aeroelectric.com>



 At 12:18 AM 10/24/2010, you wrote:

> 

>

> Bob,

>

> A thought on the battery cart. I have a tig welder that has jumpers

> for various settings that used welding cable with male ends on it as

> jumpers. The females are mounted in a panel and the only time there

> might be an exposed connector would be if someone left a jumper end

> dangling.



 Yeah . . . I considered that kind of device. They're pretty

 pricey. Take a look at the hammer-n-tongs approach and see

 what you think.

 Bob . . .

nuckolls.bob(at)aeroelect
Guest

Posted: Sun Oct 24, 2010 10:10 am Post subject: Ground Power / Tiedown Power Cart

At 08:11 AM 10/24/2010, you wrote:

 	  Quote: 	
		  

<aerobubba(at)earthlink.net>



HI All-



A couple observations-



You've got me thinking about a gadget for the chapter.  The first thing

that comes to mind is to substitute cheap AGM batteries from Batteries Plus

(or wherever) for the car batteries.  They'd be cheaper, lighter, and dump

current better than the plain flooded cell batteries.



This leads to the thought of using cast off batteries from Bob's

one-each-year-or-two battery replacement scheme, especially since that's

what I'll be doing once I get flying.  If one made a cart that wasn't

physically tailored to a specific type of battery, they could use whatever

batteries were surplussed on the field.


	


     The last battery cart project I observed was more of a

     "battery box" approach. The builder hand two-wheel hand-

     trucks and decided not to dedicate a set of wheels and

     handle to the ground start battery. He built hand-truck

     friendly box that held two batteries and a Schumacher automatic

     charger. His project was 24 v only so didn't need a

     battery 'switch'. I finished development of the geometry

     for a 6.5 x 7.5 inch assembly that could be made of

     1/8" tempered Masonite, Lexan, or other hard/durable material.

     See:



http://www.aeroelectric.com/articles/7000_Battery_Cart_Switch.pdf



     This design is based on hand-knobs I have on hand

     with 1/2-13 threaded inserts. The battery leads are

     brought to 1/2-13 x 2" brass bolts and associated

     hardware in a rectangular pattern. The spacings have

     been adjusted so that a sandwich of 1/8" masonite

     sheets, 1/8" x 1" aluminum bars can be placed over

     the studs in only two positions. The exposed

     ends of the bars are rather well guarded against

     accidental shorts on the studs while changing voltage

     setting. When the hand-knobs are in place, all exposed

     "hot" metal is pretty well covered and/or recessed.



     I'm headed to Wichita for a few days but I'll work

     up a schematic for a system with a charger and

     AC inverter built in. Charging with solar cells

     is problematic unless one is considering some

     really hefty devices like . . .



http://www.harborfreight.com/45-watt-solar-panel-kit-90599.html



     along with electronics suitable for SVLA battery

     maintenance. If folks are interested in this

     design, I can supply the hand-knobs and bus

     bars. I have access to a digital mill so it wouldn't

     be hard to build a precision drill fixture that

     precisely located the holes. Perhaps I could supply

     a "kit" of knobs, pilot drilled bus bar material,

     and a stack of 1/8" sheets also pilot drilled.

     I think you can get the brass hardware from Lowes/

     HomeDepot style big-box stores.

   Bob . . .

raymondj(at)frontiernet.n
Guest

Posted: Sun Oct 24, 2010 11:33 am Post subject: Ground Power / Tiedown Power Cart

Bob,

A very functional approach. Certainly the other end of the $time$ 

combination scale from my suggestion.

My preference is to trade more initial $time$ on the front end for 

crawling around on the grass in the cold dark mornings of January 

looking for a part my clumsy gloved hand has dropped.

That said, if you could avoid any loose parts I think it would be an 

improvement. One thought I had was to combine 2 of the jumper bars into 

a V with one leg the length to reach to make the 24 volt connection and 

the other the length to reach for the 12 volt.  With the angle between 

them such that one connection must be broken before the other could be 

made.  As I was writing I had another thought.  Just use one bar with 2 

holes, one to make the 12 and the other to make the 24. This would 

reduce the number of loose parts to the 2 knobs on the studs the jumper 

moves between, assuming the 3rd knob is only loosened to allow the 

jumper to swing.  Another evolution occurred as I was writing the above. 

  The single bar could have U shaped cutouts, rather than holes, that 

would allow the jumper to slide under the appropriate knob and eliminate 

the need for the knobs to become loose parts.

Please pardon the "stream of consciousness" rambling of the letter.

do not archive

Raymond Julian

Kettle River, MN

On 10/24/2010 01:03 AM, Robert L. Nuckolls, III wrote:

 	  Quote: 	

 <nuckolls.bob(at)aeroelectric.com>

 At 12:18 AM 10/24/2010, you wrote:

> 

>

> Bob,

>

> A thought on the battery cart. I have a tig welder that has jumpers

> for various settings that used welding cable with male ends on it as

> jumpers. The females are mounted in a panel and the only time there

> might be an exposed connector would be if someone left a jumper end

> dangling.

 Yeah . . . I considered that kind of device. They're pretty

 pricey. Take a look at the hammer-n-tongs approach and see

 what you think.

 Bob . . .

nuckolls.bob(at)aeroelect
Guest

Posted: Sun Oct 24, 2010 12:13 pm Post subject: Ground Power / Tiedown Power Cart

At 02:29 PM 10/24/2010, you wrote:

 	  Quote: 	
		  



Bob,



A very functional approach. Certainly the other end of the $time$ 

combination scale from my suggestion.



My preference is to trade more initial $time$ on the front end for 

crawling around on the grass in the cold dark mornings of January 

looking for a part my clumsy gloved hand has dropped.



That said, if you could avoid any loose parts I think it would be an 

improvement. One thought I had was to combine 2 of the jumper bars 

into a V with one leg the length to reach to make the 24 volt 

connection and the other the length to reach for the 12 volt.  With 

the angle between them such that one connection must be broken 

before the other could be made.  As I was writing I had another 

thought.  Just use one bar with 2 holes, one to make the 12 and the 

other to make the 24. This would reduce the number of loose parts to 

the 2 knobs on the studs the jumper moves between, assuming the 3rd 

knob is only loosened to allow the jumper to swing.  Another 

evolution occurred as I was writing the above.  The single bar could 

have U shaped cutouts, rather than holes, that would allow the 

jumper to slide under the appropriate knob and eliminate the need 

for the knobs to become loose parts.


	


    check your configurations for failure modes and

    potential for erroneous connections. my goal was

    to make it impossible to install a jumper in the

    wrong location that might short a battery.

    Hence the non-square pattern for the 4 posts and

    the single assembly of jumpers that guards

    most of the bare surfaces.



    As long as you can see the labels, then any way

    you install it will produce either 12 or 24 v with

    no gottchas. If you flip it over, the 12v still works

    but the 24 volt would be inert.



    I like putting the bars down over studs with a contiguous

    hole as opposed to a slot. More surface area in contact

    with the stud.

   Bob . . .

raymondj(at)frontiernet.n
Guest

Posted: Sun Oct 24, 2010 12:34 pm Post subject: Ground Power / Tiedown Power Cart

I'll take another look at it and do a drawing -IF- it seems viable after 

further analysis.



do not archive



Raymond Julian

Kettle River, MN



On 10/24/2010 03:11 PM, Robert L. Nuckolls, III wrote:

 	  Quote: 	
		   

 <nuckolls.bob(at)aeroelectric.com>



 At 02:29 PM 10/24/2010, you wrote:

> 

>

> Bob,

>

> A very functional approach. Certainly the other end of the $time$

> combination scale from my suggestion.

>

> My preference is to trade more initial $time$ on the front end for

> crawling around on the grass in the cold dark mornings of January

> looking for a part my clumsy gloved hand has dropped.

>

> That said, if you could avoid any loose parts I think it would be an

> improvement. One thought I had was to combine 2 of the jumper bars

> into a V with one leg the length to reach to make the 24 volt

> connection and the other the length to reach for the 12 volt. With the

> angle between them such that one connection must be broken before the

> other could be made. As I was writing I had another thought. Just use

> one bar with 2 holes, one to make the 12 and the other to make the 24.

> This would reduce the number of loose parts to the 2 knobs on the

> studs the jumper moves between, assuming the 3rd knob is only loosened

> to allow the jumper to swing. Another evolution occurred as I was

> writing the above. The single bar could have U shaped cutouts, rather

> than holes, that would allow the jumper to slide under the appropriate

> knob and eliminate the need for the knobs to become loose parts.



 check your configurations for failure modes and

 potential for erroneous connections. my goal was

 to make it impossible to install a jumper in the

 wrong location that might short a battery.

 Hence the non-square pattern for the 4 posts and

 the single assembly of jumpers that guards

 most of the bare surfaces.



 As long as you can see the labels, then any way

 you install it will produce either 12 or 24 v with

 no gottchas. If you flip it over, the 12v still works

 but the 24 volt would be inert.



 I like putting the bars down over studs with a contiguous

 hole as opposed to a slot. More surface area in contact

 with the stud.

 Bob . . .

nuckolls.bob(at)aeroelect
Guest

Posted: Sun Oct 24, 2010 5:39 pm Post subject: Ground Power / Tiedown Power Cart

At 03:30 PM 10/24/2010, you wrote:

 	  Quote: 	
		  



I'll take another look at it and do a drawing -IF- it seems viable 

after further analysis.


	


    I'll look forward to it. I sort of cheated with

    the AutoCAD for laying out and testing the architecture

    but we used to do it with dividers, protractor, compass

    and scissors to cut out "paper parts" for fit checks.

    Great fun and worthwhile gray matter exercise too.



    Bob . . .

raymondj(at)frontiernet.n
Guest

Posted: Sun Oct 24, 2010 7:15 pm Post subject: Ground Power / Tiedown Power Cart

Bob,



For your consideration.



do not archive



Raymond Julian

Kettle River, MN



On 10/24/2010 08:32 PM, Robert L. Nuckolls, III wrote:

 	  Quote: 	
		   

 <nuckolls.bob(at)aeroelectric.com>



 At 03:30 PM 10/24/2010, you wrote:

> 

>

> I'll take another look at it and do a drawing -IF- it seems viable

> after further analysis.



 I'll look forward to it. I sort of cheated with

 the AutoCAD for laying out and testing the architecture

 but we used to do it with dividers, protractor, compass

 and scissors to cut out "paper parts" for fit checks.

 Great fun and worthwhile gray matter exercise too.



 Bob . . .

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raymondj(at)frontiernet.n
Guest

Posted: Sun Oct 24, 2010 7:19 pm Post subject: Ground Power / Tiedown Power Cart

Clearly, designing can't be hurried. Had another thought after I sent 

the drawing.  The jumpers could be connected with an insulated bar 

connected where the insulated handles are and then break before make is 

assured and the mode change only requires moving a the handle mounted on 

the insulated bar, and of course loosening/tightening the "nuts".

do not archive

Raymond Julian

Kettle River, MN

On 10/24/2010 08:32 PM, Robert L. Nuckolls, III wrote:

 	  Quote: 	

 <nuckolls.bob(at)aeroelectric.com>

 At 03:30 PM 10/24/2010, you wrote:

> 

>

> I'll take another look at it and do a drawing -IF- it seems viable

> after further analysis.

 I'll look forward to it. I sort of cheated with

 the AutoCAD for laying out and testing the architecture

 but we used to do it with dividers, protractor, compass

 and scissors to cut out "paper parts" for fit checks.

 Great fun and worthwhile gray matter exercise too.

 Bob . . .

aerobubba(at)earthlink.ne
Guest

Posted: Mon Oct 25, 2010 7:05 am Post subject: Ground Power / Tiedown Power Cart

Hi All-



You know, the thing that would make the 12 - 24v battery cart zippy would be a DPDT knife switch cabable of handling cranking currents.  It would handle the switching function elegantly, and if mounted in a recess or under a cover would be pretty darn safe from accidental shorts.  I've not looked yet, but I wonder if such a thing is still available, especially in some sort of surpluss house...



Glen Matejcek

mdnanwelch7(at)hotmail.co
Guest

Posted: Mon Oct 25, 2010 7:26 am Post subject: Ground Power / Tiedown Power Cart

 	  Quote: 	
		   You know, the thing that would make the 12 - 24v battery cart zippy would be a DPDT knife switch 

 >I wonder if such a thing is still available, especially in some sort of surpluss house...
	


 	  Quote: 	
		   

 Glen Matejcek


	


  

 Glen,

   

   You mean like this;

  

 http://www.wirthco.com/12/24-volt-heavy-equipment-switch-p-66-l-en.html

  

   Although it isn't configured exactly yet, it wouldn't be but a very minor mod to make it so.

  

   I think you are right.  This would be a very simple solution!!

  

 Mike Welch

 		 	   		    [quote][b]

mdnanwelch7(at)hotmail.co
Guest

Posted: Mon Oct 25, 2010 7:33 am Post subject: Ground Power / Tiedown Power Cart

 	  Quote: 	
		   You know, the thing that would make the 12 - 24v battery cart zippy would be a DPDT knife switch

 > Glen Matejcek
	




  

 Glen,

  

   On second examination, yes the switch IS configured correctly right out of the box.  I see where they

 make the second set of contacts to go through the handle itself!!  Clever!

  

 Mike

 		 	   		    [quote][b]

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