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Bench tester to simulate an alternator

 
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rv8ch



Joined: 10 Jan 2006
Posts: 250
Location: Switzerland

PostPosted: Thu Oct 26, 2017 5:22 am    Post subject: Bench tester to simulate an alternator Reply with quote

Hi,

Does anyone have a recommendation for a bench tester to see how lifepo4 batteries behave during an overvoltage event?  Thinking about buying various brands of lifepo4 batteries and subjecting them to some overvoltage to see how they handle it.  For science, of course.
Thanks,
Mickey
http://rv8.ch/


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

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? Thinking about buying various brands of lifepo4 batteries and subjecting them to some overvoltage to see how they handle it. 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

PostPosted: Thu Oct 26, 2017 8:23 am    Post subject: Bench tester to simulate an alternator Reply with quote

Quote:
...

 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

   


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


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