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PWRgate

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flyboy.bob(at)gmail.com
Guest

Posted: Wed Aug 23, 2006 9:41 am Post subject: PWRgate

Bob,



West Mountain Radio http://www.westmountainradio.com/SuperPWRgate.htm

makes a product call "Super PWRgate" that looks like a reasonable

device to support a two battery (one large - one smaller) environment.



My total load with lights etc. on is about 45-50A . . . critical load

< 20A . . . really critical load  < 10A?



Please take a look and give your opinion.



Thanks,

Bob Christensen

RV-8 Bldr - SE Iowa

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flyboy.bob(at)gmail.com
Guest

Posted: Wed Aug 23, 2006 9:41 am Post subject: PWRgate

Bob,



West Mountain Radio http://www.westmountainradio.com/SuperPWRgate.htm

makes a product call "Super PWRgate" that looks like a reasonable

device to support a two battery (one large - one smaller) environment.



My total load with lights etc. on is about 45-50A . . . critical load

< 20A . . . really critical load  < 10A?



Please take a look and give your opinion.



Thanks,

Bob Christensen

RV-8 Bldr - SE Iowa

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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

nuckollsr(at)cox.net
Guest

Posted: Thu Aug 24, 2006 4:26 am Post subject: PWRgate

At 12:41 PM 8/23/2006 -0500, you wrote:



 	  Quote: 	
		  



Bob,



West Mountain Radio http://www.westmountainradio.com/SuperPWRgate.htm

makes a product call "Super PWRgate" that looks like a reasonable

device to support a two battery (one large - one smaller) environment.



My total load with lights etc. on is about 45-50A . . . critical load

< 20A . . . really critical load  < 10A?



Please take a look and give your opinion.


	


     The question to be asked/answered is: "How does this

     product deliver a return on invesetment either for

     cost or performance over the use of simple battery

     contactors for each battery wired as suggested in Z-30."



     The same question was explored on the topic of

     battery isolators some years ago at:



http://aeroelectric.com/articles/bat_iso2.pdf



      It's not clear from the West Mountain Radio

      instruction manual how this would be usef in

      an airplane.



http://www.westmountainradio.com/pdf/PG40Smanual.pdf



      It's purpose seems to be for the "more accurate"

      charging of one battery and to power some accessory

      from either battery or AC mains as the situation

      dictates. This is a bit different than the philosophy

      offered for the installation and management of dual

      batteries.



      Be wary of "bells and whistles" that seem to offer

      some whizzy features. Make sure they first address

      REQUIREMENTS you have established for how your system

      needs to operate. Then evaluate return on investment

      for the proposed product as compared with alternatives

      with an eye on (1) parts count reduction - parts not on

      the airplane are not going to break, (2) maintainability -

      if it breaks in Podunk TN, how hard will it be to

      get it fixed?, (3) weight - a pound of airplane saved

      is a pound of payload earned, (4) volume - no airplane

      has too much room to put stuff, (5) $time$ to install -

      here's your "investment" and (6) operability - does it

      increase workload? Does it demand special words in the

      POH that your fellow pilots would have to stop and think

      about. Finally (7) how does it affect your failure

      mode effects analysis. How will you KNOW it's broke?

      Are potential failures pre-flight detectable? Is a

      plan-B procedure for failure called for in the POH?



      This may seem like I'm making a mountain out of a

      mole-hill but these are the rudimentary foundations for

      systems design decisions on "real" airplanes that have

      served us well for nearly a century. I've not been

      made privy to an alternative philosophy that has proven

      useful. In fact, failure to observe this recipe for

      success has cost many of my clients and their customers

      bucket-loads of money and $time$ wasted on ill-conceived

      systems design decisions.



      Your own return-on-investment study will determine

      the usefulness of any particular feature under

      consideration. Use this List as your critical design

      review. It's a win-win. Either you shut off the computer

      grinning ear-to-ear and run off to the store to buy some

      whippy electro-whizzie or you keep a poorly considered

      idea from going into your airplane.



      Bob . . .

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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