Wotofo's upcoming Nudge squonk mod. Mechanical with a fuse?

[Walter_Sobchak]

Stumbled across this and wondered if anyone else had seen it. It says something about it being a mechanical mod but having a " safety chip that helps prevent short circuiting". Looks like a fuse to me.

Here's the link and a couple of pics

Nudge BF Squonk Mod by Wotofo | The Cloudy Vapor

 

[Walter_Sobchak]

and perhaps the worst product preview video ever produced.

 

[Rossum]

Mechanical squonk mod with a fuse has been done before. pdib's original mods had the guts of an automotive style fuse in the base. Not quite as easy to replace as this, but still relatively straightforward if you did something dumb like install set of nickel coils when you were meaning to use Kanthal.

 

[Walter_Sobchak]

Mechanical squonk mod with a fuse has been done before. pdib's original mods had the guts of an automotive style fuse in the base. Not quite as easy to replace as this, but still relatively straightforward if you did something dumb like install set of nickel coils when you were meaning to use Kanthal.

So with the fuse you can pick an amp limit and if it exceeds that it blows?

 

[gpjoe]

It looks like it comes with a green automotive blade-type fuse, which means it is good up to 30-amps. I suppose if you want to be ultra-safe you could install a 15 or 20-amp fuse. Any standard automotive fuse would fit.

 

[Rossum]

It looks like it comes with a green automotive blade-type fuse, which means it is good up to 30-amps. I suppose if you want to be ultra-safe you could install a 15 or 20-amp fuse. Any standard automotive fuse would fit.

For decent protection, you'll generally want a lower value than you think. There's a time/current curve with these fuses. A typical automotive fuse won't blow until you've run double its rated current through it for 10 seconds or more, and to get it to blow under 1 second requires something close to 5 times the rated current. This generally isn't a problem in cars because the huge (by our standards) car battery will supply ridiculous amounts of current into a dead short, but our wimpy little 18650s won't.

Bottom line: An automotive-type fuse with a rating higher than about 15 or maybe 20A is little-to-no protection at all for a single 18650 because it won't blow fast enough (if at all) on the current the battery can actually produce.

 

[Walter_Sobchak]

For decent protection, you'll generally want a lower value than you think. There's a time/current curve with these fuses. A typical automotive fuse won't blow until you've run double its rated current through it for 10 seconds or more, and to get it to blow under 1 second requires something close to 5 times the rated current. This generally isn't a problem in cars because the huge (by our standards) car battery will supply ridiculous amounts of current into a dead short, but our wimpy little 18650s won't.

Bottom line: An automotive-type fuse with a rating higher than about 15 or maybe 20A is little-to-no protection at all for a single 18650 because it won't blow fast enough (if at all) on the current the battery can actually produce.

That is some good info. Many thanks

 

[Walter_Sobchak]

DJLsb seemed to think it performed well.

 

[gpjoe]

Really, the best advice would be to treat this mod as you would any other mechanical mod and stay within the limits of your battery, regardless of the fuse rating.

 

[BoogaWu]

It will save your .... in the case of a dead short tho. I am kind of thinking about getting one.