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Bench 24 volt battery / power supply

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FatBoy

Joined: 21 Oct 2012
Posts: 19
Location: Nashville, TN

Posted: Fri Nov 16, 2012 9:14 am Post subject: Bench 24 volt battery / power supply

Can anyone make a recommendation for a cost effective bench 24 volt power supply or battery?



Thank you,



Andy Hawes

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nuckolls.bob(at)aeroelect
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Posted: Fri Nov 16, 2012 10:16 am Post subject: Bench 24 volt battery / power supply

At 11:13 AM 11/16/2012, you wrote:

 	  Quote: 	
		  



Can anyone make a recommendation for a cost effective bench 24 volt 

power supply or battery?



Thank you,



Andy Hawes


	


   How much current? What voltage range (adjustable?).

   Current limited (short circuit proof?).



   Other requirements not withstanding, these devices

   are an exceptional value right now . . .



http://tinyurl.com/d63bggc

   Bob . . .

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FatBoy

Joined: 21 Oct 2012
Posts: 19
Location: Nashville, TN

Posted: Fri Nov 16, 2012 10:27 am Post subject: Re: Bench 24 volt battery / power supply

Thanks Bob  --  Basically, I want to have something on the bench I can test anything from the 10 amp pitot tube we talked about to avionics, to radios, etc.  I will be running a 24 volt system, so looking for a supply that can provide 24 volts and maybe up to 15 amps.



Thanks for the recommendation!  If you have any other recommendations based on what I've listed here, I'm game.  Thanks again  --  Andy

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nuckolls.bob(at)aeroelect
Guest

Posted: Fri Nov 16, 2012 4:52 pm Post subject: Bench 24 volt battery / power supply

At 12:27 PM 11/16/2012, you wrote:

 	  Quote: 	
		  



Thanks Bob  --  Basically, I want to have something on the bench I 

can test anything from the 10 amp pitot tube we talked about to 

avionics, to radios, etc.  I will be running a 24 volt system, so 

looking for a supply that can provide 24 volts and maybe up to 15 amps.



Thanks for the recommendation!  If you have any other 

recommendations based on what I've listed here, I'm game.  Thanks 

again  --  Andy


	


   Okay. Test the pitot heater with a battery. The

   cold resistance of that pitot tube is likely to

   be on the order of 1/2 ohm. I.e. 56 amps inrush

   to get it started.



   I'm not sure there's any value in firing up the

   pitot tube on the ground. If it has continuity at

   something NOT a dead short . . . then the heater

   is fine. Those take so much energy that they can

   develop surface temps that discolors the chrome

   unless they're cooled by in-flight airflow.



   For all other testing, that power supply I suggested

   would probably get you going.

   Bob . . .

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FatBoy

Joined: 21 Oct 2012
Posts: 19
Location: Nashville, TN

Posted: Fri Nov 16, 2012 6:24 pm Post subject: Bench 24 volt battery / power supply

ok  --  had no idea it needed that kind of amperage to get going.  I wonder how long it needs to draw 56 amps?  Thanks again for the referral --  on order now.

On Nov 16, 2012, at 6:52 PM, Robert L. Nuckolls, III wrote:

 	  Quote: 	

 At 12:27 PM 11/16/2012, you wrote:

> 

> 

> Thanks Bob  --  Basically, I want to have something on the bench I can test anything from the 10 amp pitot tube we talked about to avionics, to radios, etc.  I will be running a 24 volt system, so looking for a supply that can provide 24 volts and maybe up to 15 amps.

> 

> Thanks for the recommendation!  If you have any other recommendations based on what I've listed here, I'm game.  Thanks again  --  Andy

  Okay. Test the pitot heater with a battery. The

  cold resistance of that pitot tube is likely to

  be on the order of 1/2 ohm. I.e. 56 amps inrush

  to get it started.

  I'm not sure there's any value in firing up the

  pitot tube on the ground. If it has continuity at

  something NOT a dead short . . . then the heater

  is fine. Those take so much energy that they can

  develop surface temps that discolors the chrome

  unless they're cooled by in-flight airflow.

  For all other testing, that power supply I suggested

  would probably get you going.

  Bob . . .

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nuckolls.bob(at)aeroelect
Guest

Posted: Sat Nov 17, 2012 6:44 am Post subject: Bench 24 volt battery / power supply

At 08:22 PM 11/16/2012, you wrote:

 	  Quote: 	
		  



ok  --  had no idea it needed that kind of amperage to get going.  I 

wonder how long it needs to draw 56 amps?


	


     Like the incandescent lamp, the heater has

     strong positive temperature coefficient of

     resistance. Unlike the lamp which heats to

     full temperature in a few hundred milliseconds,

     the pitot tube takes perhaps 30 seconds to a

     minute to get within 95% of it's terminal

     temperature.



     It only draws 56 amps for a second, 55 amps

     for the next seconds, etc



   Bob . . .

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