Why are we still talking Voltage and Resistance instead of Wattage?

[Papa Lazarou]

Where Rt = total resistance, and R1 = 1st resistor (coil), R2 = 2nd resistor, etc.

In series, Rt = R1 + R2 + R3 . . . + RN

In parallel:
for two coils: Rt = (R1 x R2) / (R1 + R2)
for more than two: Rt = 1 / ((1/R1) + (1/R2) + (1/R3) . . . + (1/RN))

Where R1 = R2, Rt = 0.5 x R1.

Has anyone thought of staged coils? A very low resistance coil on a thin wick so it'll vaporize a small amount instantly, a higher resistance on a normal wick, and a higher resistance on another normal wick.

If each wick feeds from a different chamber, you'd get a fast and hot hit of high-nicotine vapor followed by a large volume of regularly flavored no-nic and ending with a subtle overtone of a second flavor.

Thanks for the info on the right way to work out resistance for multiple coils run in parallel

As for staged coils, one possible issue with that could be that you end up with one very hot coil that favours short drags (and would burn up when given long, 5 second plus drags), and the second cooler coil which would need to be powered for a longer period to produce decent vapour. If there was a way of shutting down the hotter coil after a few seconds, transferring the work to the larger, cooler coil then maybe. But that's added complexity.

 

[bstedh]

Thanks for the info on the right way to work out resistance for multiple coils run in parallel

As for staged coils, one possible issue with that could be that you end up with one very hot coil that favours short drags (and would burn up when given long, 5 second plus drags), and the second cooler coil which would need to be powered for a longer period to produce decent vapour. If there was a way of shutting down the hotter coil after a few seconds, transferring the work to the larger, cooler coil then maybe. But that's added complexity.

We still need to keep in mind that the total resistance on a dual coil has no direct relationship to the vaping wattage. You need to think of it as two separate atty's running at the same time. You have two separate coils running at say about 9 Watts, then because of the proximity of the two coils you will have some combined heat increasing the wattage experience to about 10 or 10.5 watts with a total of about 18 watts. These numbers are just guesstimates to illustrate the difference of experience with the dual coil. edit: Then you also have to figure in the speed of a persons draw. As this will change the rate of heat dissipation at the coil. Faster draw = cooler vape, Slower draw = hotter vape. This adds a huge variable to the experience.

Edit: The draw also adds even more complexity to a dual coil as the air hitting the first coil is cooler giving it a lower temperature were the top coil is being hit with pre-heated air from the lower coil making it run at a lot higher temperature. This is one of the biggest reasons they probably have such a different experience than a single coil or two side by side attys.

Still, wattage at the coil is the best measurement of vapping experience. That is why it is used as a rating for things like soldering irons and heaters. It is the most accurate measurement we have and someone with lots of time on their hands should start a chart of all the different juices and how the react at different wattages. I think this is something juice suppliers should also add to their advertising. "recommended wattage" to bring out the full effect of their juice. =]

 

[jtpjc]

If Intel can build octo core processors, it shouldn't be too hard to build octo coil carto's.

 

[jtpjc]

Let me see if I've got this right. Over here there is 240 volt coming out of the wall. So I would need a 5760 ohm atty to vape at 10 watts. Am I correct?

 

[Nomoreash]

Let me see if I've got this right. Over here there is 240 volt coming out of the wall. So I would need a 5760 ohm atty to vape at 10 watts. Am I correct?

That's correct, enjoy.

 

[Moonflame]

I am on my second 6ml bottle of DK-TAB 18mg PG through a xl dual coil carto on a REOGrand. I did fill the carto first via condom fill method.
I vape about 10 - 20 draws and then to re-wet the filler I squeeze and draw(no power) to get the juice up to the top of the filler and then let it soak in. repeat. It took me vaping through the first 6ml bottle to get the hang of it.
The vapor is not as hot (less TH) as a LR atty but the vapor is wetter and fuller like VG, makes for a good show on exhale.
I have found that I'm changing batteries more often now. The DC carto must draw more amps than the LR atty.
Things to experiment with: shorter drip tip/no tip, higher VG mix.

I will buy more of dual coil cartos.

I'm definitely going to have to give them a try then. I just didn't want to spend money on something that someone had already found out didn't work. Glad to know they work well. I don't mind having to change batteries twice a day instead of once .

 

[atomizer mizer]

This chart should help with selecting the right resistance cartomizer or cartridge based on the voltage of your PV. This image is a picture of the original worksheet that has conditional formatting for colored cells. The safe range in this image is from 4 to 8.5 watts. Any combination of voltage and resistance that burns between 4 and 8 watts is highlighted in green. Red is burning too hot and may melt solder or nichrome wire and yellow is not enough power and may not produce enough vapor or non at all. The safe range can easily be changed which instantly changes the color formatting.
This is still a work in progress and I may release the original worksheet when I have reviewed any input.

 

[Silent Soldier]

This chart should help with selecting the right resistance cartomizer or cartridge based on the voltage of your PV. This image is a picture of the original worksheet that has conditional formatting for colored cells. The safe range in this image is from 4 to 8.5 watts. Any combination of voltage and resistance that burns between 4 and 8 watts is highlighted in green. Red is burning too hot and may melt solder or nichrome wire and yellow is not enough power and may not produce enough vapor or non at all. The safe range can easily be changed which instantly changes the color formatting.
This is still a work in progress and I may release the original worksheet when I have reviewed any input.

Looks good, let me know if you decide to release. I'd definitely like a copy. Or at least the formula.

 

[DC2]

I look forward to more feedback on your spreadsheet, and the safe range, from long-time power vapers.

I tried to do a poll to find out what wattage people like to vape at...
http://www.e-cigarette-forum.com/forum/polls/151932-where-your-sweet-spot.html

I don't know if those poll results are remotely valid or not.
But I do know there aren't enough voters.

 

[BuzzKill]

From all of the data we have gotten from Beta tests and users 7-9 watts seems to be the SWEET SPOT for 90% of vapors

 

[atomizer mizer]

View attachment 37350
This is the most current version. It doesnt take into consideration dual bridges or variences in materials but it should get in the ballpark. I agree with BuzzKill's 7-9 watts as the sweet spot. Just change the min p and max p and the chart will change. If you have a juice that likes a colder burn just lower those numbers.
Cells that can be changed include.

1.) min p or minimum wattage
2.) max p or maximum wattage
3.) resistance axis
4.) voltage axis

Looks good, let me know if you decide to release. I'd definitely like a copy. Or at least the formula.

 

[BuzzKill]

View attachment 37350
This is the most current version. It doesnt take into consideration dual bridges or variences in materials but it should get in the ballpark. I agree with BuzzKill's 7-9 watts as the sweet spot. Just change the min p and max p and the chart will change. If you have a juice that likes a colder burn just lower those numbers.
Cells that can be changed include.

1.) min p or minimum wattage
2.) max p or maximum wattage
3.) resistance axis
4.) voltage axis

Cool chart Ato !! nice job .

To add to this discussion HIGHER resistance and HIGHER voltage = LOWER current and LONGER battery life FYI

 

[atomizer mizer]

What surprised me most about this project was that given the highest resistance cartriges i've seen are 3.5 ohms, PV's with a voltage above 5.5v are only good for hot vaping and may burn the juice. My next PV will go above 5 volts but it has to be variable so I can enjoy my juices at a lower wattage\voltage. Thank you for trying it out and the input. I hope it becomes useful for you.

Atomizer Mizer

Cool chart Ato !! nice job .

To add to this discussion HIGHER resistance and HIGHER voltage = LOWER current and LONGER battery life FYI