Resistance on Dual Coil Cartomizer Tanks?

[Ch!pDasRipp3r]

So I recently ordered some 510 DCCs and a tank. It'll be my first cartomizer, besides the little ones on a cig a like.
I bought them at an ohm of 1.5, but I heard because it's a dual coil, I'd treat it like a 3.0ohm, and vape at a higher voltage.
Is this true?


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[Katya]

Yup!

vaping a 1.5Ω dual-coil atty is like vaping two 3.0Ω atties at the same time. Yes, you get more vapor, but that vapor is cool, unless you crank up the voltage way up--and hope that your battery can supply the amps. You're draining the battery (your battery still reads the 1.5Ω resistance of the atomizer) and using up the juice at a higher rate.

That said, many people like dual coils and the extra vapor they provide. Others like the warmth of the top-coil design--since the top coil (both in dual coils and in top-coil single coils) is placed so close to the vaper's mouth, the vapor feels warmer.

Electrically speaking, we're dealing with a parallel circuit--1.5Ω dual coil is really two 3.0Ω coils side-by-side on the same connector. So the voltage must be calculated for 3.0Ω, NOT the 1.5Ω. Which means, if you like 6 watts of power, you'll have set your voltage to 4.2v if you want to achieve that wattage with your DC 1.5Ω device.

 

[Ch!pDasRipp3r]

Yup!

Vaping a 1.5Ω dual-coil atty is like vaping two 3.0Ω atties at the same time. Yes, you get more vapor, but that vapor is cool, unless you crank up the voltage way up--and hope that your battery can supply the amps. You're draining the battery (your battery still reads the 1.5Ω resistance of the atomizer) and using up the juice at a higher rate.

That said, many people like dual coils and the extra vapor they provide. Others like the warmth of the top-coil design--since the top coil (both in dual coils and in top-coil single coils) is placed so close to the vaper's mouth, the vapor feels warmer.

Electrically speaking, we're dealing with a parallel circuit--1.5Ω dual coil is really two 3.0Ω coils side-by-side on the same connector. So the voltage must be calculated for 3.0Ω, NOT the 1.5Ω. Which means, if you like 6 watts of power, you'll have set your voltage to 4.2v if you want to achieve that wattage with your DC 1.5Ω device.

Awesome, and I could crank that up a little to 4.5-4.8 volts, putting my into the ballpark of 7-8 watts, correct?
Also, is there a noticeable difference from 4.2v to 4.5v?


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[Katya]

It depends on the amp limit of your battery. What battery are you using? What's the amp limit, do you know?

Ohm's Law cannot be defied. V = IR holds true always, regardless of the variables.

If you have two 3Ω coils, you have a total resistance of 1.5 Ohms. Let's say you put a 1.5Ω atty on 4 volts:

4 V = I x 1.5Ω
I = 4/1.5
I = 2.67 Amps

If the battery can't supply that much current something has to give. Since you can't change the resistance of the coils to keep the voltage constant, the voltage must drop.

In other words, if the battery doesn't have enough amps, it will just drop the voltage... If the voltage drops, so does the wattage, as wattage = voltage squared divided by resistance (P = V2/R)

 

[Ch!pDasRipp3r]

It depends on the amp limit of your battery. What battery are you using? What's the amp limit, do you know?

Ohm's Law cannot be defied. V = IR holds true always, regardless of the variables.

If you have two 3Ω coils, you have a total resistance of 1.5 Ohms. Let's say you put a 1.5Ω atty on 4 volts:

4 V = I x 1.5Ω
I = 4/1.5
I = 2.67 Amps

If the battery can't supply that much current something has to give. Since you can't change the resistance of the coils to keep the voltage constant, the voltage must drop.

In other words, if the battery doesn't have enough amps, it will just drop the voltage... If the voltage drops, so does the wattage, as wattage = voltage squared divided by resistance (P = V2/R)

I may be wrong, but I believe the MVP I'd like to use the tanks on has a amp limit of 3.0.
For a device with that amp limit, would you recommend higher resistance coils the next time around?


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[Katya]

I would recommend starting lower with your dual coils. You'll get a lot of vapor from those two heating coils and and it will feel warm because of the proximity of the heating coil to your mouth. Start at ~3.4 volts and then go up gradually until you hit your spot. Just bear in mind that even though your MVP will tell you that you're vaping at 8 watts, you're actually vaping at 3.9 watts with your setup.

Those dual coils are tricky.

Next time I would recommend you try a single-coil topper and see how it compares to your dual coils.

Anyway, I prefer single coils myself, but, of course, YMMV.

 

[Blkwdw86]

I'm one of those thorough people, I take NOTHING at face value.

I check every head/coil I use with a multimeter as I install it. I haven't had any problems yet, but I do know that knockoffs and clones of popular equipment abound with questionable quality control. Some equipment isn't up to par and needs to be compensated for, sometimes people mix up parts and give you the wrong thing, hell, even I could put a wrong part in. It only takes a second to check and know for sure. Then you can set your voltage with confidence that it's right and will work as expected.

IMHO, a decent digital multimeter is required equipment for this hobby.

 

[Ch!pDasRipp3r]

I would recommend starting lower with your dual coils. You'll get a lot of vapor from those two heating coils and and it will feel warm because of the proximity of the heating coil to your mouth. Start at ~3.4 volts and then go up gradually until you hit your spot. Just bear in mind that even though your MVP will tell you that you're vaping at 8 watts, you're actually vaping at 3.9 watts with your setup.

Those dual coils are tricky.

Next time I would recommend you try a single-coil topper and see how it compares to your dual coils.

Anyway, I prefer single coils myself, but, of course, YMMV.

So if I have an 8 watt hotspot on single coils, I'll need 16 watts for a dual coil?
I may be totally off. I didn't know a second coil affected things this much! Haha


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[Ch!pDasRipp3r]

I'm one of those thorough people, I take NOTHING at face value.

I check every head/coil I use with a multimeter as I install it. I haven't had any problems yet, but I do know that knockoffs and clones of popular equipment abound with questionable quality control. Some equipment isn't up to par and needs to be compensated for, sometimes people mix up parts and give you the wrong thing, hell, even I could put a wrong part in. It only takes a second to check and know for sure. Then you can set your voltage with confidence that it's right and will work as expected.

IMHO, a decent digital multimeter is required equipment for this hobby.

I may be making another investment then! Haha.


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[BernieVideo]

UM, if the carto is rated at 1.5 ohms, then that is what it is no matter how many coils it has.

You should choose your voltage based on 1.5 ohms. I run my 2.2 ohm cartos at 4 to 4.5 volts. I am gonna guess you will need to run yours at 3.7 volts and lower or it's going to taste burnt.

 

[Katya]

So if I have an 8 watt hotspot on single coils, I'll need 16 watts for a dual coil?
I may be totally off. I didn't know a second coil affected things this much! Haha


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I'm not sure what you mean by 8 watt hotspot?


Don't worry too much about the Ohm's Law and all the math--just start low and then adjust your voltage (or wattage) to your liking. But please do start low--3.4 or 3.6 volts.

 

[Katya]

I may be making another investment then! Haha.


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You have already made that investment--your APV comes with a built-in Ohm reader and volt meter. You just need to learn how to use them.

 

[Ch!pDasRipp3r]

I'm not sure what you mean by 8 watt hotspot?


Don't worry too much about the Ohm's Law and all the math--just start low and then adjust your voltage (or wattage) to your liking. But please do start low--3.4 or 3.6 volts.

I meant like a perfect wattage at 8 on a single coil haha.
But I definitely will start low until I get the hang of it. Thanks so much for your help!
Also, I found out how to use the resistance checker on my APV. Thanks again!


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