Coil Ohms Question

[Miata GT]

If there is a FAQs on this please point me in the right direction.

Im wondering what what advantage there is to using various ohms coils if you have a vv/vw mod? If you set the battery at say 8ohms, and assuming the voltage in the battery compensates for different ohm coils, what difference would it make if you use the same wattage in a 1.8ohm coil versus a 2.4ohm coil?

 

[robgggg]

I just got my first VV/VW and was wondering the same thing..

 

[Thrasher]

none really. the ohms just dictate more the response time of a coil when heated. and how much energy you need to use.

it is also to know what to use one what device. for a stick battery you should use around 1.5-1.8 on a mod with VV you could go for 2 ohms and have plenty of range to adjust up or down to your liking.

they only reason for knowing in say, a clearo is you dont want to start at 3 volts every time and vape half the tank turning up the voltage every hit until you find the correct setting.

if i pick up a 2 ohm coil i can assume if i start at 3.8v i will be very close. maybe a bump or two to find the sweet spot.

what difference would it make if you use the same wattage in a 1.8ohm coil versus a 2.4ohm coil?

in some premade devices the coil just isnt designed for high power, even though the wattage may not change several other things like voltage and amperage will, and they all affect the way something produces vapor. and one coil may work awesome at 8 watts yet another cant keep up and you get dry hits.

 

[elfy]

I believe that a lower resistance coil is going to get hotter a bit faster. I am 100% not an expert on that stuff, so...lets see what one of the bigger kids has to say about it


in my blog is a chart about watts/resistance etc, its post #3, take a look if you are curious..its a chart folks are posting/sharing so pass it around if you like. I didnt make it lolz..

i *have* rebuilt some of my coils, on Kanger mini protank IIs, I tried to make them in the 2.0 ohm range for my little Kanger EVOD VV battery. When I made one with less wraps (and less ohms) it would get HOT fast and also run out the batt kinda quick. I made one with more wraps and tried to kinda...take it down a notch as far as just zapping my juice lol.

 

[dice57]

The lower the ohms the higher the watts produced at the same voltage. For a regulated device, this won't matter much. Then it comes down to which wire and what ohms fired at produces the best vape for you. It comes down to the personal preference disclaimer once more. Also, lower ohm builds tend to heat up faster than the higher ohm builds. Although a micro coil will heat up pretty darned fast no matter the ohm build. So back to personal preference. Now if you have a device that puts out 15 watts and enjoy max watt vaping, then it's best to build coils under 2 ohms, because once you get above 2.4 ohms a 6 volt output can't supply enough juice to fire at 15 watts.

 

[rdwilliamson]

Using wattage provides some consitancy. If you set it at 8 watts the chip adjusts the volts on any atty to give you 8 watts of power to it. Instead of using ohms law to figure out how many volts you need for 8 watts it is taken care of for you.

 

[p.opus]

Watts are what provide your flavor.

Lets say you are wanting to drive your coil at 7.0 watts

With a 1.8 ohm coil you need 3.54 volts at 1.97 amps

With a 2.4 ohm coil you need 4.09 volts at 1.7 amps.

Thus with a higher ohm coil you draw less amperage and thus your battery lasts longer between charges, since a battery is rated for a specific number of mAh's.

Before VV/VW batteries, the ONLY way you could increase wattage was to decrease the resistance of the coil since batteries had a fixed voltage. You sacrificed the length of your charge for flavor.

With a VV/VW battery, you can use a higher ohm coil. Since you can set the battery to a higher voltage, (potential energy) you can achieve the same power with less current (apmerage). Thus you will get a longer time between charges.

 

[sawlight]

The problem lies within all the other factors! Different wire gauges heat up faster and slower, what are you using for a wicking material, ss mesh seems to absorb some of the heat from my experience.
Larger gauge wire heats more slowly, so lower ohms make it a good use. Thinner wire heats up faster, don't try to do low ohm builds with 36 gauge wire!
RBA's have created a new sub-element of vaping it seems. On my Provari, I like something in the 1.7-1.8 ohm range around 4v. On my mechanicals, I like around 1.2 ohm, depending on the juice, but either way, it works out around 8-10 watts for me.
There are just so many factors involved, it's a very hard question to answer, I hope you can kind of see that now!

 

[suspectK]

I use 3ohm cartomizers.. don't care really about resistances on RBAs, unless I'm showing someone something..I don't do deciohm coils.

I get less gunk build-up from sweet/strong flavors with high resistances. RBAs I can just change wick and burn gunk off, if I get wicking issues.

 

[Nuclear]

One difference is that it'll take less voltage to get the same wattage on a lower resistance coil. A 1.8 Ohm coil would need 3.8V to get 8W, but a 2.4 Ohm coil would need 4.4V.

 

[tgg1304]

 

[Miata GT]

LOL!!!

So if I have a vv/vw battery I would be better off with a higher ohm coil to save battery life, at the expense of a slower response from the coil?

 

[Baditude]

If there is a FAQs on this please point me in the right direction.

Volts, Watts, Ohms, & Amps

Finding Your Flavor's "Sweet Spot" Using Variable Voltage

Taking the Mystery Out of Variable Wattage

 

[sawlight]

LOL!!!

So if I have a vv/vw battery I would be better off with a higher ohm coil to save battery life, at the expense of a slower response from the coil?

See, now that opens up another can of worms! According to ohms law you are correct. But the problem comes when you are only using one battery. With one battery you are still at 3.7v (theoretic) and have to boost the voltage through a boost circuit, so you have to figure in the loses of the circuit as well as the draw on the battery itself. It's a misnomer if you will.
Doing the math,
4 ohm coil at 6v= 9 watts at 1.5 amps. This sounds great, BUT the battery is still only 3.7v! But to get that same 9 watts we'd need a 1.5 ohm carto pulling 2.4 amps. This does not figure in the 15%, or so, loss in the boost circuitry.
Now if we use a buck circuit, and start with a higher voltage and drop it, we don't see the load on the battery, but still include some loss with the circuitry.
Clear as mud?

 

[TUC]

Using a Variable Wattage device, your Amps and Voltage output will deviate depending on the Ohms of the coil. This has an effect on your battery life, and depending on your amperage limitations, will impede the ability of the device to even operate (low ohms/high amperage). This is why sub-ohm coils are used on mech. mods (amperage limitations are no longer an issue, only battery concerns).

When comparing setups, IMHO the result has more to do with the Atty/Carto design. The vape between my single coil carto tank compared to my RBD Atty (same ohms) are completely different when vaping with my ProVari at the same setting.

Air flow is one of the most underrated and overlooked aspects when it comes to performance of any Ohm coil.

Ohms Law Calculator

E-Cig Battery Calculator

Understanding Variable Voltage Electronic Cigarettes

Understanding E-Cigarette Battery Usage

 

[dice57]

It all comes back down to personal preference again and what gives me the best vape. I look at what build and ohms gives the best vape for the atomizer I am using. Some atomizers are not suited for sub ohm builds, because they could never wick enough or breathe enough to handle high watts. Most of my rba's will vape great at 15 watts, but have a couple that excel in the 30+ watt range, so I do my builds accordingly. One has to look at all the factors to determine what will work best, and then you are right back to personal preference once more.

 

[TUC]

It all comes back down to personal preference again and what gives me the best vape. I look at what build and ohms gives the best vape for the atomizer I am using. Some atomizers are not suited for sub ohm builds, because they could never wick enough or breathe enough to handle high watts. Most of my rba's will vape great at 15 watts, but have a couple that excel in the 30+ watt range, so I do my builds accordingly. One has to look at all the factors to determine what will work best, and then you are right back to personal preference once more.

In vaping, whether it be the device size, device performance, ohms, wattage, or volts...it's ALWAYS personal preference.

 

[Rader2146]

Watts are what provide your flavor.

Lets say you are wanting to drive your coil at 7.0 watts

With a 1.8 ohm coil you need 3.54 volts at 1.97 amps

With a 2.4 ohm coil you need 4.09 volts at 1.7 amps.

Thus with a higher ohm coil you draw less amperage and thus your battery lasts longer between charges, since a battery is rated for a specific number of mAh's.

Before VV/VW batteries, the ONLY way you could increase wattage was to decrease the resistance of the coil since batteries had a fixed voltage. You sacrificed the length of your charge for flavor.

With a VV/VW battery, you can use a higher ohm coil. Since you can set the battery to a higher voltage, (potential energy) you can achieve the same power with less current (apmerage). Thus you will get a longer time between charges.

This is incorrect. With a VV/VW device, efficiency is the only thing that will effect battery life if power is a constant.
Battery Life - Low Resistance, High Resistance, and Efficiency.

 

[Katya]

In a nutshell:

Disclaimer: This is the most simplistic explanation and is addressed to new vapers mostly or vapers who are happy within the recommended "just right" power zone (4.5-8 watts). [If you are using dual coil atomizers or are interested in high wattage vaping, it's a different conversation altogether. You will also have to understand the concept of amp limits and how it applies to high power vaping.]

Ohm's Law as it pertains to vaping is really not that complicated--and it's very useful when you want to know what you're doing.

Voltage and wattage are often misunderstood by new vapers. Wattage is the power (heat, sweet spot) that your PV (battery and atomizer) generates. Wattage = Voltage (of your battery) squared divided by Resistance (Ω) of your atomizer [P=V[SUP]2[/SUP]/R]. If you're not good at math, don't worry, use this easy calculator:

Online Conversion - Ohm's Law Calculator

Of course, if you own a VW (variable wattage) device, you don't really need this calculator because your device will do the math for you.

The wattage you want, especially at the beginning of your vaping career, should be somewhere between 4.5 and 8.5 Watts. Anything lower than 4.5 watts may not vaporize your juice properly and will not produce enough warmth and vapor. Anything above 8.5 watts increases the risk of burning the filler in your cartomizers (if you're using them) and even some juices, especially the delicate ones.

There are, of course, other variables, like eliquid and JDD (juice delivery devices) that you're using on your batteries. Seven watts on a filler type cartomizer may feel different than the same 7 watts on a fillerless clearomizer or a dripping atomizer. The same is true for different eliquids; tobaccos, chocolate and coffees generally require more wattage (heat), while fruit and other delicate flavors do better with less heat. Everyone's sweet spot is different--those are just very general guidelines.

Experiment and you'll find your own bliss in no time!

When in doubt, start low and adjust your voltage/wattage up as needed.

 

[TUC]

This is incorrect. With a VV/VW device, efficiency is the only thing that will effect battery life if power is a constant.
Battery Life - Low Resistance, High Resistance, and Efficiency.

"The law of conservation of energy states that power in (watts) must equal power out."