Question about sub ohm vaping

[cradleinflames]

So, I had a few questions about sub ohm vaping, because it seems to be very popular but either I'm missing something or something doesn't add up.

I've seen people talk about 0.2 ohms, I might've even seen someone post about 0.08 ohms. My question is, what is the point? Is the current limit of their battery very high?

I guess I look at it like this. Batteries have an output limit, which means they have a low limit to their resistance. If you have a 5A capable battery that goes up to 6V, your resistance limit is going to be 1.2 ohms. In order to get down in the range of 0.2 ohms, you'd either need a much higher current limit (@6V, you'd need 30 amps), or you'd need to run it at a much higher voltage (@5A, you'd need 25V). And that's completely ignoring any power ratings.

Since most mods operate at 3-6V or so, I'd say the limits on the battery would need to be much higher but I have a hard time believing the batteries are putting out 30A of current (if so, that's pretty ballsy and I really, really hope anyone using a setup like this has a battery with short circuit protection built in . . .), so either I'm missing something (which is likely, I'm not going to pretend to be an expert in the vaping field at all), or is it possible people think they're vaping at a lower amperage but the batteries are preventing them from vaping down at those levels?

Any input from an electrical perspective would be appreciated cuz I'm having a hard time wrapping my head around what's going on. Thanks!

 

[Completely Average]

I use Orbtonic SX30 batteries. They are 30A 18650 batteries. Sony VTC3-5 are also 30A batteries, and MNKE makes 30A batteries as well.

Efest has some purple batteries which claim to be 35A, but they measure in bursts rather than continuous. Continuous they are 25A batteries.


And then there are 26650 batteries which are 50A batteries.

 

[Wickeddeuce]

Sub ohming is primarily done through mechanical mods which will fire at any ohms so a .2 ohm coil on a fresh battery putting out 4.2 volts assuming no voltage drop equates to 88 watts at 21 amps.

 

[hdsixhundred]

The battery wont limit you... the battery will let you do whatever you want until it explodes lol. There are a TON of batteries out there and some of which are not for vaping but for flashlights/headlamps etc. Look into the high end Sony VTC4/5's at 30A in 18650 or the Sony US26650VT which do 50A. You would not be running a 5A battery at .2 ohms as it is dangerous as hell. There really is no "point" to extreme sub ohming (imo) other than vapor production/cloud chasing. The guys who run . 0X builds are usually running parallel battery builds which can handle it as the load is split across the batteries.

 

[tj99959]

Sub ohming is primarily done through mechanical mods which will fire at any ohms so a .2 ohm coil on a fresh battery putting out 4.2 volts assuming no voltage drop equates to 88 watts at 21 amps.

Meanwhile I'm happy as a lark vaping away at 7 watts at 1.8 amps from my RDA on a mecanical.

 

[Razzlematt]

I think plenty of folks don't realize that they need to subtract the internal resistance of whatever DMM or other device used to measure the resistance of their finalized coils. Perhaps many people are vaping even lower resistance than they think.

I'm quite happy at .75-.90 ohms. Sony VTC4/VTC5 or MNKE batteries, no problems thus far.

 

[Completely Average]

I think plenty of folks don't realize that they need to subtract the internal resistance of whatever DMM or other device used to measure the resistance of their finalized coils.

I'm pretty sure anyone who is subohming at these levels knows how to properly calibrate their meters correctly and calculates and subtracts the resistance of the meter itself before taking ohms readings with it.

It would be very hard to come up with a subohm coil at all if you didn't subtract the resistance of the meter which is usually close to 1 ohm by itself.

 

[cradleinflames]

Wow, that is really crazy because that is a LOT of current . . . most electrical devices operate at well under an amp so to me, the idea of running 30A from a battery is pretty amazing. No wonder they give warnings not to get into rebuildables unless you know what you're doing.

Thanks for clearing that up for me! Time to do some research on mechanical mods!

 

[Completely Average]

Wow, that is really crazy because that is a LOT of current . . . most electrical devices operate at well under an amp so to me, the idea of running 30A from a battery is pretty amazing. No wonder they give warnings not to get into rebuildables unless you know what you're doing.

My wife looked at me like I was insane when I first told her that I had bought some 30A batteries, and then explained that .1A can be lethal. She still can't wrap her head around the idea that I'm using a battery that pushes out 300 times more than a lethal current, and that the current is passed through the body of the mod which I am holding in my unprotected hand. She just doesn't get the "path of least resistance" concept.

 

[JTrain23]

I usually keep my rigs at around .42ohms to .55ohms. And I won't use anything except my MNKE batts under .5ohms.

 

[Razzlematt]

I do know that the young folks that know everything at my local vape shop didn't know this.

I'm pretty sure anyone who is subohming at these levels knows how to properly calibrate their meters correctly and calculates and subtracts the resistance of the meter itself before taking ohms readings with it.

It would be very hard to come up with a subohm coil at all if you didn't subtract the resistance of the meter which is usually close to 1 ohm by itself.

 

[JaRod]

I am also missing something here, most circuit breakers in my home are 15 amps meaning any device draining more than that will activate the breaker. Yet I can connect in any outlet, a heat gun using 2000 watts without skiping a beat, If I wick the heat gun's resistance, soak it with ejuice, and turn that thing on you'll see more vapor that you can possible inhale with a tiny "sub ohm" dripper. And it wont be requiring anywhere near to 15 amps let alone 30Amps.... So I am lost too.

 

[Wickeddeuce]

I am also missing something here, most circuit breakers in my home are 15 amps meaning any device draining more than that will activate the breaker. Yet I can connect in any outlet, a heat gun using 2000 watts without skiping a beat, If I wick the heat gun's resistance, soak it with ejuice, and turn that thing on you'll see more vapor that you can possible inhale with a tiny "sub ohm" dripper. And it wont be requiring anywhere near to 15 amps let alone 30Amps.... So I am lost too.

this is because of the voltage that goes through it. Amps are calculated by volts divided by resistance whereas watts are volts times volts divided by resistance.





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[Mackks]

I have a .5 ohm duel coil setup (tons of research on mnke batts yadda yaddah). I was blowing awesome clouds, then ran out of my juice. Ran down to a local vendor for something to hold me over until vape mail arrives. This juice is a simple 6mg peach, and it is slaughtering my throat with throat hit. What gives? I assume it's high pg, but is this something else I need to consider when buying juice? The 50/50 blends I have are delicious and work fine, but I just can't stand the th of this juice.

 

[DasBluCig]

I have a .5 ohm duel coil setup (tons of research on mnke batts yadda yaddah). I was blowing awesome clouds, then ran out of my juice. Ran down to a local vendor for something to hold me over until vape mail arrives. This juice is a simple 6mg peach, and it is slaughtering my throat with throat hit. What gives? I assume it's high pg, but is this something else I need to consider when buying juice? The 50/50 blends I have are delicious and work fine, but I just can't stand the th of this juice.

High PG tends to give more throat hit.....You can try cutting it with some straight VG (from Wal-Mart, etc.), understanding that doing so is likely to mute the flavor somewhat...YMMV....
Good Luck!
Happy (vaping) Trails!