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Scorpion Power ProModeler
HelicopterMain Discussion › Reducing the internal resistance of LiPos
05-07-2017 12:47 AM  78 days agoPost 261
JuanRodriguez

Elite Veteran

The Villages, Florida

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Why are you so reluctant to do what people that know what they are talking about are suggesting??

EEngineer suggested the use of a resistor way back and you ignored the suggestion.

Now AirWolf is suggesting the same thing and you're ignoring his suggestions as well .....

Been there, done that and old enough to know better.....

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05-07-2017 12:48 AM  78 days agoPost 262
AirWolfRC

rrProfessor

42½ N, 83½ W

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If your expected run time in service is 30 to 40 minutes on a 3AH pack then the results will be meaningful (5 amps from a 3AH pack - - the discharge limit of your charger).

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05-07-2017 01:00 AM  78 days agoPost 263
heliraptor10

Key Veteran

kokomo, in-US

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Juan

AirWolfRC is suggesting a resistor for discharge.

EE wanted me to use one in charging to increase the EMF.

And I am not ignoring anyone.

I am trying to get a consistent opinion on what data would be meaningful.

Goblin! where have you been all my life?
RC helis, the original fidget spinners

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05-07-2017 06:33 AM  78 days agoPost 264
EEngineer

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TX

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"EE wanted me to use one in charging to increase the EMF."

You commented that your charger was operating erratically at ~ 5A....

I suggested that you separate your coil current from your charging current....by using a resister in series with the coil...so your charger operates properly....without having that load imbalance.

Also, you could vary the coil current(varying the magnetic field)...independent of your charge rate.

At that point, you were "into" charging....

Now, you've changed to discharging....

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05-07-2017 07:53 AM  78 days agoPost 265
heliraptor10

Key Veteran

kokomo, in-US

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And I explained that the power supply is at fault.

The Instability at 5 amps is independent of the coil.

Are we all having fun repeating ourselves?

Goblin! where have you been all my life?
RC helis, the original fidget spinners

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06-14-2017 05:08 PM  39 days agoPost 266
heliraptor10

Key Veteran

kokomo, in-US

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I haven't given up on this as of yet.

Went a few rounds with a 4mm kidney stone.

Gonna have to start over with 2 new test subjects. Despite having explained to everyone that lipos are ruined by being drained all the way, and despite having a battery alarm hooked up, they decided to keep running the power wheels till it died.

So my A and B batteries are toast.

Goblin! where have you been all my life?
RC helis, the original fidget spinners

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06-14-2017 05:13 PM  39 days agoPost 267
EEngineer

Elite Veteran

TX

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Ooooo...man....hope you're ok...

No rush...take your time...

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 14 pages [ <<    <     12      13     ( 14 )    >    >> ] 5058 views POST REPLY
Scorpion Power ProModeler
HelicopterMain Discussion › Reducing the internal resistance of LiPos
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