Hello, I am a novice vaper, I do sub ohm builds all the time and really enjoy a solid cloud, I just saw a guide on how to build a dual parallel coil that goes to 0.09ohms, and after plugging 3.7V and 30amps into ohms law calculator is says 0.17ohm is as low as that can handle, I don't know if I am plugging the right things into the calculator, but how is it possible that a 0.09 ohm build is OK on a 3.7V sony VTC5 battery 18650? that just doesn't seem to make sense to me, when I plug 0.09ohm and 30amps into the calculator it comes out to 2.7V, can anyone give me a quick description of what exactly the ohms law calculator is telling me? I thought it meant if I was vaping with a 3.7V battery the lowest build I can do is 0.17 ohms, so how can a 0.09ohm build be OK? I am baffled by this haha
Quick Question about Ohms Law
- Thread starter BradMccullin
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I thought it was unsafe, and to be sure there's no way I am trying it, but I saw on Rip Tripper video he did it no problem, I know he's a professional and does this for a living which is probably how he gets away with it, but that's crazy! Here's the video if you're interested: https://www.youtube.com/watch?v=CePIUN2-JiA
It certainly is possible. Advisable? Probably not. At 3.7V a .09 coil is pulling 41A from the battery. (insert pulse rating "debate" here)
I'd honestly be more worried about running that close to a dead short.
When your battery is fully charged it will be at 4.2v, so you should use that figure in your Ohm's Law calculator. If you do that with a .09ohm resistance you'll see that it will draw 46.67 amps which exceeds the rated amp limit of your Sony VTC5 battery.
Wild, right? Just thought I'd get some other advice to assure myself this is an intense build
You should do your voltage calculations at 4.2v as that is the starting voltage fresh off the charger. Also according to my ohm calc @ 4.2v the lowest a person could go would be .14 ohm which would be 30 amps on the dot. But I wouldnt go that low as it doesn't leave any room for error any where . And venting super hot battery acid can't be good for the face.
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0.09 ohms is risky at best, totally unsafe at worst.
There is no way to "know" you have built to any particular ohm without very good and expensive equipment, an ohms checker is not sufficiently accurate.
I have found that +/- 0.15 ohms is about on par with the devices we usually have access to check ohms. So in my view assume your ohms are 0.15 below what they read on your device to be safe.
That equates to a total resistance of around 0.29 as lowest safe ohms, assuming your battery is in fact a 30A battery.
If you assume a 10% potential error on your battery, 0.31 ohms would be the safe limit.
People who vape below the 0.17 range are taking risks, risks that in my opinion have no tangible reward.
Vape safe, and you'll vape trouble free for as long as you can imagine, vape dangerous, and you'll vape till your luck runs out.
Maurice
There is no way to "know" you have built to any particular ohm without very good and expensive equipment, an ohms checker is not sufficiently accurate.
I have found that +/- 0.15 ohms is about on par with the devices we usually have access to check ohms. So in my view assume your ohms are 0.15 below what they read on your device to be safe.
That equates to a total resistance of around 0.29 as lowest safe ohms, assuming your battery is in fact a 30A battery.
If you assume a 10% potential error on your battery, 0.31 ohms would be the safe limit.
People who vape below the 0.17 range are taking risks, risks that in my opinion have no tangible reward.
Vape safe, and you'll vape trouble free for as long as you can imagine, vape dangerous, and you'll vape till your luck runs out.
Maurice
It certainly is possible. Advisable? Probably not. At 3.7V a .09 coil is pulling 41A from the battery. (insert pulse rating "debate" here)
I'd honestly be more worried about running that close to a dead short.
The hilighted portion was:
how is it possible that a 0.09 ohm build is OK on a 3.7V sony VTC5 battery 18650?
It is certainly possible to stick a 0.09 ohm build on a battery. It's just not possible that doing this would be OK.
IMO... You're on borrowed time running coils below .2 ohms.
It's too close to a dead short and you're plowing through more juice than you need to. It's just my opinion though.
Below .17 and you're just being dangerous
It's too close to a dead short and you're plowing through more juice than you need to. It's just my opinion though.
Below .17 and you're just being dangerous
Good question and good answers. Avoiding the presentation of Darwin Awards is an ECF specialty.
My reading comprehension is a bit off today - my bad.
And, as noted, all calcs should be done assuming a fully charged battery at 4.2V. I used 3.7V to illustrate that even a reduced charge battery will still be pulling more amps than advisable.
I don't know how someone could stand 196 watts to begin with?? That's just crazy!
Depends on the build, 18awg kanthal a1 on 3.5mm inside diameter built in quad parallel form would be exceptionally warm but not beyond the bounds of vapable. Not suggesting that build but it is what it is.
Maurice
Well, a 60 Watt light bulb gets pretty hot, so just imagine vaping with 3 of those 8-o
Vape temperature would be very warm but not yet scalding hot, the build itself remains unsafe, unadvisable, and to some extent I regret mentioning it.
Maurice
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