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EXPbus 2

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al38kit

Joined: 13 Jul 2009
Posts: 21

Posted: Mon Jul 13, 2009 6:08 am Post subject: EXPbus 2

Has anyone experience with the EXPbus 2...?



Thinking of using one in my rebuild of an Express.  I plan to have a dual alternator and battery set up.



Good or bad?



Al Kittleson

MII

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nuckolls.bob(at)aeroelect
Guest

Posted: Mon Jul 13, 2009 6:39 am Post subject: EXPbus 2

At 09:08 AM 7/13/2009, you wrote:

 	  Quote: 	
		  



Has anyone experience with the EXPbus 2...?



Thinking of using one in my rebuild of an Express.  I plan to have a 

dual alternator and battery set up.



Good or bad?


	


    Not "bad" . . . just poor return on investment.

    Goto my website and use the Google search tool

    to find instances of "exp"



        Bob . . .



         ---------------------------------------

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

         ---------------------------------------

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ianxbrown

Joined: 16 May 2009
Posts: 80

Posted: Mon Jul 13, 2009 6:52 am Post subject: EXPbus 2

Relatively good experience with the product.  Nothing good to say about

the support.  There's one good guy there but he's impossible to get a

hold of.



You need to keep the EXP2BUS squeaky clean while installing it, and make

sure you can get at it for servicing, debugging.  I made both mistakes -

got a shard of aluminum across two posts and blew a component, despite

having vacuumed the area carefully.  Took six weeks to resolve.



Beware that there is an undocumented over-voltage protection jumper that

can shut down the board if your alternator puts out a tad too much

voltage.  You're best to deselect that option according to their support

people, if you have alternate means of over-voltage protection.



Ian Brown

Bromont

Quebec



On Mon, 2009-07-13 at 07:08 -0700, al38kit wrote:

 	  Quote: 	
		   

 

 Has anyone experience with the EXPbus 2...?

 

 Thinking of using one in my rebuild of an Express.  I plan to have a dual alternator and battery set up.

 

 Good or bad?

 

 Al Kittleson

 MII

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p 52779#252779

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ianxbrown

Joined: 16 May 2009
Posts: 80

Posted: Mon Jul 13, 2009 8:53 am Post subject: EXPbus 2

Actually, I recall price and simplicity of the panel as two of my main

drivers, and they've actually both held true.  The current price is $299

and for that you get the functionality of ten switches and ten circuit

breakers plus a whole load of other functionality.



Van's price for pull circuit breakers is $23 each, and you get ten.



Toggle switches are about eight bucks and you get ten. 



You're ahead ten bucks before you begin to talk about wire, added

functionality, etc.



If the "investment" is purely financial, it's certainly not an expensive

way to go.



Only having one breaker to check (alt) is a time saving and an added

safety factor, in my mind.  I am certainly not as well versed in

aero-electrics as the typical contributors to this list, but I'm content

with the product.



Ian



On Mon, 2009-07-13 at 09:38 -0500, Robert L. Nuckolls, III wrote:

 	  Quote: 	
		   

 

 At 09:08 AM 7/13/2009, you wrote:

 >

 >

 >Has anyone experience with the EXPbus 2...?

 >

 >Thinking of using one in my rebuild of an Express.  I plan to have a 

 >dual alternator and battery set up.

 >

 >Good or bad?

 

     Not "bad" . . . just poor return on investment.

     Goto my website and use the Google search tool

     to find instances of "exp"

 

 

 

         Bob . . .

 

          ---------------------------------------

         ( . . .  a long habit of not thinking   )

         ( a thing wrong, gives it a superficial )

         ( appearance of being right . . .       )

         (                                       )

         (                  -Thomas Paine 1776-  )

          ---------------------------------------

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peter(at)sportingaero.com
Guest

Posted: Mon Jul 13, 2009 9:29 am Post subject: EXPbus 2

My experience is reasonably poor. I would not use one in another aircraft. I

bought my aircraft with an Exp Bus 2 installed and have flown it for 7

years. Consider:



- Limited expansion potential. It is not possible to add additional

protected circuits as the number of "breakers" is fixed.



- Unable to implement a dual busbar system very easily - I'm sure there is a

way to do it but I haven't figured it out.



- Expensive for what it is. A fuse block is much cheaper and more versatile.

My system has still has a master relay. You really should fit the indicator

panel otherwise there is no indication if a "breaker" blows. At $350,

including a mounting bracket, it is expensive. A couple of fuse blocks will

do the same job.



- Intermittent faults. Very occasionally I have a momentary power outage

that has to be something to do with the Exp bus, although I have not been

able to find out what it is. Fault finding is difficult.



I am about to re-build my panel, the Exp Bus 2 will definitely not be flying

with me next year.



Peter



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flybill2usa(at)msn.com
Guest

Posted: Mon Jul 13, 2009 11:21 am Post subject: EXPbus 2

Ian

 I bought a EXP tray from ACS about 4 years ago for $424.00 plus a little shipping. I stuck it in the panel of my RV-7 project and was going to use it when my engine supplier suggested a different way of handling my dual electrical system that I understood better and elected not to use the EXP tray which is still sitting in the hangar unused and I will sell it for $200 and ship it if you are interested.

 Bill Schoen

 flybill2usa(at)msn.com (flybill2usa(at)msn.com)

 719 859-1424

 	  Quote: 	
		   Subject: Re: EXPbus 2

 From: ixb(at)videotron.ca

 To: aeroelectric-list(at)matronics.com

 Date: Mon C 13 Jul 2009 12:51:05 -0400

 --> AeroElectric-List message posted by: Ian <ixb(at)videotron.ca>

 Actually C I recall price and simplicity of the panel as two of my main

 drivers C and they've actually both held true. The current price is $299

 and for that you get the functionality of ten switches and ten circuit

 breakers plus a whole load of other functionality.

 Van's price for pull circuit breakers is $23 each C and you get ten.

 Toggle switches are about eight bucks and you get ten. 

 You're ahead ten bucks before you begin to talk about wire C added

 functionality C etc.

 If the "investment" is purely financial C it's certainly not an expensive

 way to go.

 Only having one breaker to check (alt) is a time saving and an added

 safety factor C in my mind. I am certainly not as well versed in

 aero-electrics as the typical contributors to this list C but I'm content

 with the product.

 Ian

 On Mon C 2009-07-13 at 09:38 -0500 C Robert L. Nuckolls C III wrote:

 > --> AeroElectric-List message posted by: "Robert L. Nuckolls C III" <nuckolls.bob(at)aeroelectric.com>

 > 

 > At 09:08 AM 7/13/2009 C you wrote:

 > >--> AeroElectric-List message posted by: "al38kit" <alfranken(at)msn.com>

 > >

 > >Has anyone experience with the EXPbus 2...?

 > >

 > >Thinking of using one in my rebuild of an Express. I plan to have a 

 > >dual alternator and battery set up.

 > >

 > >Good or bad?

 > 

 > Not "bad" . . . just poor return on investment.

 > Goto my website and use the Google search tool

 > to find instances of "exp"

 > 

 > 

 > 

 > Bob . . .

 > 

 > ---------------------------------------

 > ( . . . a long habit of not thinking )

 > ( a thing wrong C gives it a superficial )

 > ( appearance of being right . . . )

 > ( )

 > ( -Thomas Paine 1776- )

 > ---------------------------------------

 > 

 > 

 > 

 > 

&gt-= --> http://www.matronics.com/Navigator?AeroElectric-List

&gt=======================

&g=======

[quote] 

   	  Quote: 	
		  [b]

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al38kit

Joined: 13 Jul 2009
Posts: 21

Posted: Mon Jul 13, 2009 11:31 am Post subject: Re: EXPbus 2

Thanks for the info.  I found the Panel and annunciator on Ebay and bought it for just over $200 total...I'm going to set it up on the bench and trip some circuits and see how I like it...Thanks,

Al

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Ed Anderson

Joined: 10 Jan 2006
Posts: 475

Posted: Mon Jul 13, 2009 1:44 pm Post subject: EXPbus 2

I do not have an EXP2 bus, but,  I assisted a guy who purchased an RV 6A

with an EXP2 bus.  They had to jump start the aircraft at every stop despite

having put in a new battery to ferry it home.  It turns out somebody had

shorted out the EXP2 board apparently by permitting the B lead of an

alternator to ground while the boards master switch was on.  This caused a

short from battery to ground through the board, fried the on-board relay and

heated the traces on the circuit board so hot the solder coating flowed off

of the.  They then made it worst by soldering a heavy jumper across the

socket that held the on-board relay.  This ensured the battery could not be

disconnected from the alternator even with the master off (that was the

basic purpose of the fried relay)which what cause the battery to drain down

whenever the engine was not running.



But, that said, anybody can abuse an electrical system.  The new owner

elected to replace the board and has had no problem since.  However, other's

have mentioned some of its limitations (not easy to expand). But, it might

be better choice for some folks than trying to roll their own.  The price is

certainly not unreasonable for what you get.  However, there have been

reports of unexpected responses that appear to be fairly rare - but get your

attention when they happened.



One of the things that would worry me a bit, is you have high current traces

exposed on the PC board - it would not take much for a aluminum chip, screw,

piece of wire, washer, etc to lay across some traces and a ground trace

releasing the magic smoke.



YMMV.



Ed Anderson



Rv-6A N494BW Rotary Powered



Matthews, NC



eanderson(at)carolina.rr.com



http://www.andersonee.com



http://www.dmack.net/mazda/index.html



http://www.flyrotary.com/



http://members.cox.net/rogersda/rotary/configs.htm#N494BW



http://www.rotaryaviation.com/Rotorhead%20Truth.htm



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_________________
Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com

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