[EVDL List]

Since it's the 4th of July, I thought it might be an appropriate time to
post this link:

http://www.youtube.com/watch?v=A-MoPe0oY_0&feature=plcp

It shows what happens if you put 70 vdc across an ordinary 24 ohm 1/4w
carbon film resistor. It bursts into flames! The guy in the video uses
them to light fireworks. :-)

This sort of thing can happen to a BMS. When a cell fails open, the full
pack voltage appears across the BMS input. If the designer didn't think
of this, it can create a fire just like this.
--
Ring the bells that still can ring
Forget your perfect offering
There is a crack in everything
That's how the light gets in.
-- Leonard Cohen, from "Anthem"
--
Lee A. Hart, 814 8th Ave N, Sartell MN 56377, leeahart at earthlink.net

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[EVDL List]

Wow, this is a great idea for someone with a miniature landscape
like a model railway who likes to celebrate Independence or
Newyears day on miniture scale ;-)

I see that he uses 2 resistors in series, plugged into his
"lanch" control board using Ethernet cables and he is using
the resistors to set off the fuse of fireworks, so he can
control it from a distance.

Cor van de Water
Chief Scientist
Proxim Wireless Corporation http://www.proxim.com
Email: xxx@xxx.xxx Private: http://www.cvandewater.com
Skype: cor_van_de_water XoIP: +31877841130
Tel: +1 408 383 7626 Tel: +91 (040)23117400 x203

-----Original Message-----
From: xxx@xxx.xxx.edu [mailto:xxx@xxx.xxx.edu] On
Behalf Of Lee Hart
Sent: Wednesday, July 04, 2012 4:33 PM
To: EV list
Subject: [EVDL] Why ordinary resistors shouldn't be used as fuses

Since it's the 4th of July, I thought it might be an appropriate time to
post this link:

http://www.youtube.com/watch?v=A-MoPe0oY_0&feature=plcp

It shows what happens if you put 70 vdc across an ordinary 24 ohm 1/4w
carbon film resistor. It bursts into flames! The guy in the video uses
them to light fireworks. :-)

This sort of thing can happen to a BMS. When a cell fails open, the full
pack voltage appears across the BMS input. If the designer didn't think
of this, it can create a fire just like this.
--
Ring the bells that still can ring
Forget your perfect offering
There is a crack in everything
That's how the light gets in.
-- Leonard Cohen, from "Anthem"
--
Lee A. Hart, 814 8th Ave N, Sartell MN 56377, leeahart at earthlink.net

_______________________________________________
| Moratorium on drag racing discussion is in effect.
| Please take those discussions elsewhere. Thanks.
|
| REPLYING: address your message to xxx@xxx.xxx.edu only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| CONFIGURE: http://lists.sjsu.edu/mailman/listinfo/ev

_______________________________________________
| Moratorium on drag racing discussion is in effect.
| Please take those discussions elsewhere. Thanks.
|
| REPLYING: address your message to xxx@xxx.xxx.edu only.
| Multiple-address or CCed messages may be rejected.
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