My Kentucky Fried Fingers

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izeman   10 GW

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My Kentucky Fried Fingers

Post by izeman » Oct 12 2018 10:48am

Now i'm also member of the elite club of Kentucky Fried Fingers.
No idea how this happened. I connected the second in parallel battery with XT60 plug. And suddenly a big flash and the XT60s internals where gone and my hand was black.

https://www.dropbox.com/s/9ejnd11oy4k0d ... .05.28.jpg

e-beach   100 MW

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Re: My Kentucky Fried Fingers

Post by e-beach » Oct 12 2018 10:52am

That's offal! Hope your not hurt bad.

Why the shorted connectors?

:shock:
Favorite Quote: "This is L.A., sugar. There is no 'over the top." --- Chris Erskine

Current build: Liahona w/ cheap front suspension and suspension seat post. Yescomusa 36v 800w generic front hub motor. 15ah Headway triangle mounted pack. Tronsung 30 amp,

Previous Build:1992 Trek Antelope 800 - Bone Crusher (no suspension) - Yescomusa 800 watt 36 volt front wheel kit. Don't do it! Get suspension!!!

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brumbrum   100 kW

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Re: My Kentucky Fried Fingers

Post by brumbrum » Oct 12 2018 10:58am

izeman wrote:
Oct 12 2018 10:48am
Now i'm also member of the elite club of Kentucky Fried Fingers.
No idea how this happened. I connected the second in parallel battery with XT60 plug. And suddenly a big flash and the XT60s internals where gone and my hand was black.

https://www.dropbox.com/s/9ejnd11oy4k0d ... .05.28.jpg
Ha-ha,, i love it.. We've all done it, and if you aint... You will! It's a right of passage. There will be an original thread with lots of photos somewhere. Here are a few nasty's.... viewtopic.php?f=1&t=46713&hilit=Kff&start=25
My NYX and cromotor build
viewtopic.php?f=6&t=74615
My LMX 161 dirt bike build
viewtopic.php?f=6&t=94074

2WheelsMovesTheSoul   100 W

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Re: My Kentucky Fried Fingers

Post by 2WheelsMovesTheSoul » Oct 12 2018 11:36am

Nothing will scare this crap outta you faster than accidentally creating a high voltage arc 3 feet from your face and searing your retinas like tuna steaks.

Welcome to the club.

dustNbone   10 kW

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Re: My Kentucky Fried Fingers

Post by dustNbone » Oct 12 2018 1:24pm

How far apart were the voltages of the 2 packs you were connecting?

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izeman   10 GW

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Re: My Kentucky Fried Fingers

Post by izeman » Oct 13 2018 1:54am

The two batteries were exactly the same voltage. The balance connectors of both where already connected to the BMS. I was just connecting the XT60 to the parallel harness. But even if i tried to put them together in reverse this would have been imho impossible.
Luckily i wasn't hurt. A few hours later there are no blisters. I was lucky.
Btw voltage of the pack was only 45V.

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Re: My Kentucky Fried Fingers

Post by markz » Oct 13 2018 4:21pm

Pretty tame there izeman, welcome to the elite club :D
izeman wrote:
Oct 13 2018 1:54am
-

e-beach   100 MW

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Re: My Kentucky Fried Fingers

Post by e-beach » Oct 13 2018 9:59pm

Glad you are OK!!!, but it could only be two things, as far as I can tell.....

1. A dead short or
2. A huge voltage transfer once connected.

If I am wrong please correct me.

:D
Favorite Quote: "This is L.A., sugar. There is no 'over the top." --- Chris Erskine

Current build: Liahona w/ cheap front suspension and suspension seat post. Yescomusa 36v 800w generic front hub motor. 15ah Headway triangle mounted pack. Tronsung 30 amp,

Previous Build:1992 Trek Antelope 800 - Bone Crusher (no suspension) - Yescomusa 800 watt 36 volt front wheel kit. Don't do it! Get suspension!!!

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izeman   10 GW

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Re: My Kentucky Fried Fingers

Post by izeman » Oct 14 2018 2:00pm

e-beach wrote:
Oct 13 2018 9:59pm
1. A dead short or
2. A huge voltage transfer once connected.
You're correct. I think the same. But both batteries where and still are at the EXACT same voltage. I took them out of the bike just 2h ago, and they have been in parallel before.
I will need to see if it is SOMEHOW possible to short an XT60 plug by putting them together in reverse or somehow else.

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Re: My Kentucky Fried Fingers

Post by r3volution » Oct 14 2018 8:36pm

Image

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DanGT86   10 kW

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Re: My Kentucky Fried Fingers

Post by DanGT86 » Oct 14 2018 9:09pm

Could the contacts have pushed out of the plastic or been misaligned such that they touched together? Probably hard to figure out what happened unless you can catch all the smoke and reassemble it. Glad your fingers survived.

flat tire   10 kW

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Re: My Kentucky Fried Fingers

Post by flat tire » Oct 14 2018 9:59pm

Reverse polarity.

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Icewrench   10 kW

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Re: My Kentucky Fried Fingers

Post by Icewrench » Oct 14 2018 10:08pm

So I read this in the afternoon.
That evening bbuzzaaappp a small star shows up while shorting a couple wires.
Seem to always be looking right at it and think I am paying attention to what I am doing.

Oh well.
Till next time...

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izeman   10 GW

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Re: My Kentucky Fried Fingers

Post by izeman » Oct 15 2018 2:49am

Haha. Maybe i have to add that i had two glasses of wine before this happened. But i was for sure able to drive, and not drunk. I'm still have the impression that it is IMPOSSIBLE to cause a short with XT60s.

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madin88   100 MW

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Re: My Kentucky Fried Fingers

Post by madin88 » Oct 15 2018 7:08am

izeman wrote:
Oct 15 2018 2:49am
Haha. Maybe i have to add that i had two glasses of wine before this happened. But i was for sure able to drive, and not drunk. I'm still have the impression that it is IMPOSSIBLE to cause a short with XT60s.
DC voltage can be completely strange in terms of sparking.
I would believe you that there was no short and no voltage difference (so virtually no current flow during plug in) because i had a similar incident and also heard about other cases which were unaccountable.

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DanGT86   10 kW

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Re: My Kentucky Fried Fingers

Post by DanGT86 » Oct 15 2018 9:11am

Total longshot here but is it remotely possible that so much static could build up that an initial static spark created an ionized pathway for a larger discharge? Seems theoretically possible but if so I would think things would be spontaneously exploding more often.

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izeman   10 GW

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Re: My Kentucky Fried Fingers

Post by izeman » Oct 15 2018 11:52am

Had a discussion with maddin88 about that, and he mentioned that we should not be talking about 50V, but 2x 50V = 100V as i was trying to put two batteries together "in reverse". Safety distance rule of thumb on a PCB is 1mm/100V AC, don't know if it is different for DC.
I may try a "laboratory conditions like" test, with big leather gloves, eye protection etc with two 12s LIPO packs and see if it is somehow possible to reproduce this result. shouldn't do any harm as long as the contacts don't weld together. And in that case i still can cut one wire with a side cutter.
What do you think? Should i do it?

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Re: My Kentucky Fried Fingers

Post by e-beach » Oct 15 2018 12:25pm

:shock:

Do it with some friends around so they can enjoy the fireworks as well.

:lol:
Favorite Quote: "This is L.A., sugar. There is no 'over the top." --- Chris Erskine

Current build: Liahona w/ cheap front suspension and suspension seat post. Yescomusa 36v 800w generic front hub motor. 15ah Headway triangle mounted pack. Tronsung 30 amp,

Previous Build:1992 Trek Antelope 800 - Bone Crusher (no suspension) - Yescomusa 800 watt 36 volt front wheel kit. Don't do it! Get suspension!!!

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dogman dan   100 GW

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Re: My Kentucky Fried Fingers

Post by dogman dan » Oct 24 2018 7:37am

One of them plugs/ packs must have been wired wrong. You clearly connected black to red, whatever color the wires were.


It could be awhile before you figure out what you did wrong, but something went wrong. When I do it, its always that I wired a plug wrong, or grabbed the wrong plug in a mess of em, and accidentally make that big short.


One way I have done it before, is having the balance plugs wired different than the mains. one in series, one in parallel. But that generally cooks off a balance plug, or the balance board.

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izeman   10 GW

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Re: My Kentucky Fried Fingers

Post by izeman » Oct 24 2018 9:57am

No. I may repeat: This pack WAS wired before for over a year. Connected, disconnected, reconnected. The XT60 ARE irreversible, the balance wires are as well. I can't imagine that it's possible to connect the jst-xh 16pin connector in the reverse order.

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marty   10 MW

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Re: My Kentucky Fried Fingers

Post by marty » Oct 24 2018 10:18am

izeman wrote:
Oct 15 2018 2:49am
Haha. Maybe i have to add that i had two glasses of wine before this happened. But i was for sure able to drive, and not drunk. I'm still have the impression that it is IMPOSSIBLE to cause a short with XT60s.
Get some heavy leather gloves and safety glasses. Drink two glasses of wine. Using same connectors. Try to make a spark.

Long sleeve shirt and long pants would also be a good idea when playing with sparks.
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Re: My Kentucky Fried Fingers

Post by neptronix » Oct 24 2018 10:42am

In your honor, we now have a new emoticon :kff: :lol:
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izeman   10 GW

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Re: My Kentucky Fried Fingers

Post by izeman » Oct 24 2018 12:54pm

Haha. I will try my best not to repeat :kff:

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dogman dan   100 GW

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Re: My Kentucky Fried Fingers

Post by dogman dan » Oct 29 2018 7:05am

I just assumed something had just been re soldered, re wired. That's my favorite way to KFF.

Had to be a short somewhere though.

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izeman   10 GW

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Re: My Kentucky Fried Fingers

Post by izeman » Oct 29 2018 9:04am

Last weekend i reinstalled the batteries in the bike. I wore glasses and thick leather gloves. Made a video while i connected the plugs. Guess what: Nothing happened. Like several times before.
To make the situation a bit more clear i made some pics of the bike and the connectors:
2018-10-26 at 15.27.45.JPG
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2018-10-26 at 15.29.53.JPG (111.48 KiB) Viewed 434 times
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2018-10-26 at 15.31.34.JPG (113.48 KiB) Viewed 434 times
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2018-10-26 at 15.32.26.JPG (136.89 KiB) Viewed 434 times
2018-10-26 at 15.35.37.JPG
2018-10-26 at 15.35.37.JPG (164.19 KiB) Viewed 434 times

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