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Bench tester to simulate an alternator

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rv8ch

Joined: 10 Jan 2006
Posts: 250
Location: Switzerland

Posted: Thu Oct 26, 2017 5:22 am Post subject: Bench tester to simulate an alternator

Hi,



Does anyone have a recommendation for a bench tester to see how lifepo4 batteries behave during an overvoltage event?Â  Thinking about buying various brands of lifepo4 batteries and subjecting them to some overvoltage to see how they handle it.Â  For science, of course.

Thanks,

Mickey

http://rv8.ch/

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_________________
Mickey Coggins
http://www.rv8.ch/

nuckolls.bob(at)aeroelect
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Posted: Thu Oct 26, 2017 6:33 am Post subject: Bench tester to simulate an alternator

At 08:13 AM 10/26/2017, you wrote:

  	  Quote: 	
		  Hi,



 Does anyone have a recommendation for a bench tester to see how lifepo4 batteries behave during an overvoltage event?Â  Thinking about buying various brands of lifepo4 batteries and subjecting them to some overvoltage to see how they handle it.Â  For science, of course.



 Thanks,

 Mickey

 http://rv8.ch/ 	




  Sure, a beefy constant V, constant I power supply is the

  tool of choice for output currents of 50 amps or so.



  Supplies large enough to emulate runaway alternators

  are getting harder to find.



  I've had one of these on my bench for about 15 years



  http://tinyurl.com/yaab7r95



  a more modern device might be more to liking



  http://tinyurl.com/y82h9vmm



 

  Actually, since you're emulating a runaway

  alternator, perhaps tight control over voltage

  is unnecessary. You just need a current source

  with an open circuit voltage substantially

  greater than the battery.



  Perhaps a couple of 24v, 20A supplies in parallel



  http://tinyurl.com/y7yj2468



   You could rig an array of paralleled

   light bulbs with switches to serve as an

   adjustable, power resistor to give some

   control over current to the battery. Alternatively,

   you can buy 50w power resistors really cheap

   off banggood.com



   Here's an exemplar switched resistor load bank I built

   for a customer



 [img]cid:.0[/img]



   Resistors are mounted on 1/8 alum plates and force

   air cooled.  The little collection of parts in the

   lower left corner are a zero-to-max variable load

   used in combination with switches to 'dial in' what

   ever load you wish to run at.



 



 



 

 

   Bob . . .

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rv8ch

Joined: 10 Jan 2006
Posts: 250
Location: Switzerland

Posted: Thu Oct 26, 2017 8:23 am Post subject: Bench tester to simulate an alternator

 	  Quote: 	
		  ...



 Â Actually, since you're emulating a runaway

 Â alternator, perhaps tight control over voltage

 Â is unnecessary. You just need a current source

 Â with an open circuit voltage substantially

 Â greater than the battery.



 Â Perhaps a couple of 24v, 20A supplies in parallel



  http://tinyurl.com/y7yj2468



Â  Â 

	




Great idea - I think I can find plenty of these laying in our scrap server pile - thanks a bunch!

Â

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_________________
Mickey Coggins
http://www.rv8.ch/

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