puff puff the magic smoke. Why?

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ken1645   10 W

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puff puff the magic smoke. Why?

Post by ken1645 » May 23 2013 2:26pm

magic-smoke.gif
wtf
magic-smoke.gif (17.61 KiB) Viewed 710 times
Why did this just spark up the 4mm bullet connector and short it out? I don't see why it would have shorted.

Was trying to charge 10s2p on my thunder charger but when I connected the + and - together to get the 5s into series to make 10s it smoked up... now I gotta resolder on some more connectors. I'm getting quite good at it now though which is good.

Thankfully these connectors burn them selves until they aren't connected, the batteries appear to be fine, each has 3.93V on all the packs..
thx

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liveforphysics   100 GW

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Re: puff puff the magic smoke. Why?

Post by liveforphysics » May 23 2013 3:43pm

Could it have been capacitors not being pre-charged?
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Re: puff puff the magic smoke. Why?

Post by ken1645 » May 23 2013 3:51pm

liveforphysics wrote:Could it have been capacitors not being pre-charged?
hmm don't think so, it was just batteries connected to batteries. No caps. I had the 4 batteries about ready to charge.. I did have the balancer plugs plugged into the charger of all 4 battery packs.. maybe that was my flaw.

Anyways I'll stay away from charging in parallel for a while I suppose. I don't think my diagram above is flawed.

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Re: puff puff the magic smoke. Why?

Post by cal3thousand » May 23 2013 3:53pm

Or the packs were paralleled at the cell where you didn't expect?
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Re: puff puff the magic smoke. Why?

Post by docnjoj » May 23 2013 3:56pm

You did parallel the paralled packs balance wires? The Thunder only has 2 ports for Balancing. If they are backwards (first being negative and 2nd for positive) you should just get an error message, not sparks. Did you try to parallel the series connections balance connecters? Just guessin' but I dont see why sparks should appear.
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Re: puff puff the magic smoke. Why?

Post by chroot » May 23 2013 4:06pm

@ken1645 - Let me ask you some couple question.

1. Did your main lead connector hooked E.g. controller or charger before you hooked the series wiring?
2. Did you parallel (A) LiPo pack before you hooked (B) LiPo E.g. 10Ah vs 5Ah
3. Does both paralleled packs fully charged (different volt from A to B probably will spark)
4. Did you paralleled balance lead together (A and B) before hook up the series? This will spark for sure.


These list above will cause you spark when you hooked series wiring. I always do first paralleled A and B packs in complete fully charged as equal voltage before going series. I never get any spark as long as the main lead connectors isn't hook or shorted somewhere.
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Re: puff puff the magic smoke. Why?

Post by Ypedal » May 23 2013 4:12pm

take a picture of your actual setup and post it... :wink:
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Re: puff puff the magic smoke. Why?

Post by liveforphysics » May 23 2013 4:19pm

ken1645 wrote:
liveforphysics wrote:Could it have been capacitors not being pre-charged?
hmm don't think so, it was just batteries connected to batteries. No caps. I had the 4 batteries about ready to charge.. I did have the balancer plugs plugged into the charger of all 4 battery packs.. maybe that was my flaw.

Anyways I'll stay away from charging in parallel for a while I suppose. I don't think my diagram above is flawed.

Sounds like you had balance tap plugs combined so you were putting the cells in parallel, then attempting to put them in series with the discharge leads, which is the same as just mashing positive to negative.
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Re: puff puff the magic smoke. Why?

Post by migueralliart » May 23 2013 7:22pm

But wouldn't that just evaporate the balance leads? Those are what 22ga cable.

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Re: puff puff the magic smoke. Why?

Post by chroot » May 23 2013 8:11pm

If the paralled balance hooked and the main series wiring will spark and the balance wiring will be very hot.

Only it will vaporize the balance lead hook up while the main wiring is on series hooked.

That's what I noticed the ES member mentioned in past.

migueralliart wrote:But wouldn't that just evaporate the balance leads? Those are what 22ga cable.
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Re: puff puff the magic smoke. Why?

Post by ken1645 » May 23 2013 10:20pm

chroot wrote:@ken1645 - Let me ask you some couple question.

1. Did your main lead connector hooked E.g. controller or charger before you hooked the series wiring?
2. Did you parallel (A) LiPo pack before you hooked (B) LiPo E.g. 10Ah vs 5Ah
3. Does both paralleled packs fully charged (different volt from A to B probably will spark)
4. Did you paralleled balance lead together (A and B) before hook up the series? This will spark for sure.


These list above will cause you spark when you hooked series wiring. I always do first paralleled A and B packs in complete fully charged as equal voltage before going series. I never get any spark as long as the main lead connectors isn't hook or shorted somewhere.
#4 yes I had done that. I did not realize the balance leads needed to be hooked up last. Valuable lesson, glad that the batteries survived. Took em out for a ride today and they're doing great.

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Re: puff puff the magic smoke. Why?

Post by dogman dan » May 24 2013 5:30am

We ALL belong to the KFF club brother. Welcome. I did it again myself just the other day. I run 14s now, and was putting together another pack with some 5s and 4s. So I built a 14s pack from three 5s and one 4s. 19s, which didn't like being plugged parallel with a 14s pack. Killed some tabs in the 4s packs that were the + end.

Uhh, how did I manage to do one that stupid?

What was the question again? Chronic fatigue could just as well be called chronic stupid. Tired is dumb.

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ken1645   10 W

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Re: puff puff the magic smoke. Why?

Post by ken1645 » May 24 2013 10:55am

I figured it out and got it charging 10s2p now. Since the voltages across the parallel should be the same I'm only using 1 of the balance plugs from each parallel'ed 5s pack. Connected the balance plugs last FTW.

Next trick will be 10s4p :twisted:

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