What would use less power....

[erikbal]

I'm going to be ordering replacement coils soon and am curious about something. Normally I would order 1.8ohm because I was stuck at a regulated 3.3v. Well now since I got my MVP2 I don't have that problem. I am curious what would use less power, a 1.8 ohm coil at 3.8v, or a 2.2 ohm coil at 4.2v, or would there be no difference in power? From what I've read lower resistance coils seem to use more power. Just something I'm curious about. Trying to figure out if I want to go with 1.8 ohm heads and keep the voltage down some or go with a higher ohm coil and crank the voltage up. I'm considering the 1.8 ohms that way they'll still function ok on my back up ego batteries. Any input is appreciated!

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[quatro]

1st setup will push 2.1A, 2nd setup will push 1.9A both burning @8W. You will get a few more puffs with the 2nd setup. You will see noticeably longer battery life if you go 3 ohm at 4.9V (1.6A draw @ 8W).

 

[generic mutant]

Bookmark it! It is the law, after all...

Ohm's Law Calculator

 

[NicoHolic]

Rounded off, they're both 8 watts. The drain on the battery will be the same. That's the principle of the conservation of energy. One has to remember with a regulated mod, the actual current drawn from the battery is at least coil current times the result of coil voltage divided by battery voltage. Many forget this. They also see the rating of the battery in amp-hours and forget it stores energy, not just current. That's where the erroneous belief that drawing the same power with higher voltage on higher resistance will get longer battery life comes from. They forget the higher voltage has a huge cost in current.

 

[Thrasher]

With a VV/VW or regulated mod the difference in savings is very small because of the electronic circuit that has to adjust the power. what you save in power drawn out of the battery is lost to the conversion circuit anyways. so in most cases you will very little difference anymore.

 

[generic mutant]

...They forget the higher voltage has a huge cost in current.

I'm confused. High voltage will use less current for the same power, according to ohms law calculators.

Not that I understand anything about physics, but I've certainly heard it stated enough times by people who sound like they know what they're talking about that higher current is more efficient...

Is what you're saying only applicable to regulated mods?

 

[NicoHolic]

If the regulated mod is set at 6 volts and you have a 3 ohm coil, the current through the coil is 2 amps, and you have 12 watts. But where does that 6 volts come from when the battery voltage is only 4 volts? The boost circuit draws 2 amps x 6/4 (plus the loss in the boost circuit itself), which is 3 amps, from the 4 volt battery to create that 6 volts at 2 amps for the coil.

This is no different than using 4 volts with a 1.33 ohm coil, where you have the same 12 watts, and 3 amps from the battery. With a regulated mod, you'd still have some loss in the circuitry.

 

[erikbal]

So basically there's not going to be much difference with either one. Not enough to really matter anyways? I think I'll get the lower resistance heads because they'll work better on my regulated 3.3v ego back up battery. Although I'm asking for a vv v3 for Christmas, but I still want them to work well with my back ups for back ups lol.

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[Train2]

Seems consensus that there's no substantial battery life difference.
And I did what you did - started with LR, so that I could use the same coils on my Egos.

But I HAVE noticed, tested, and confirmed - somehow, there IS a difference in performance (perhaps it's the speed at which the coil's going to heat up?) Bottom line - at the same power (say 8 watts) you still get a difference in vapor and flavor between lower resistance and higher resistance coils.

Try both, decide which you like!

 

[yzer]

Rounded off, they're both 8 watts. The drain on the battery will be the same. That's the principle of the conservation of energy. One has to remember with a regulated mod, the actual current drawn from the battery is at least coil current times the result of coil voltage divided by battery voltage. Many forget this. They also see the rating of the battery in amp-hours and forget it stores energy, not just current. That's where the erroneous belief that drawing the same power with higher voltage on higher resistance will get longer battery life comes from. They forget the higher voltage has a huge cost in current.

Thanks for clarifying this matter. I use the 2.0 ohm Smok single coil cartos I used on my semi-regulated 3.7V rig with the Sigelei Zmax I use now.

Am I right in this? The significant difference between using a LR cartomizer (say, 2.0 ohms) and a HR carto (say, 3.0 ohms) on a VV/VW rig is the range of wattage possible from each. 3.0 ohms will operate with a wider power range. The LR carto will be more limited at top end power, burning at higher wattage.

 

[NicoHolic]

Am I right in this? The significant difference between using a LR cartomizer (say, 2.0 ohms) and a HR carto (say, 3.0 ohms) on a VV/VW rig is the range of wattage possible from each. 3.0 ohms will operate with a wider power range. The LR carto will be more limited at top end power, burning at higher wattage.

Honestly, I've never really thought about it. It seems to me that even with a regulated mod that only output 5 volts, you'd be able to dial in "too much" power with either resistance carto. From a Vapeaggedon standpoint, 1.8-2.0Ω works with everything from a 510 cigalike to either a regulated or mechanical 18650 mod. It's about the coolest I'd want on a mech.

For the OP, my Kanger's came with 2.5Ω heads, so I use those up in my eVic ProTanks. But when I bought replacement heads, they were 1.8Ω. Some may find 1.8Ω too warm on 3.7V EVOD batteries or mechs, though. I don't.

Hope this helps.

 

[erikbal]

Thanks for all the replies guys! This is why I love this place..

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[BernieVideo]

Seems consensus that there's no substantial battery life difference.
And I did what you did - started with LR, so that I could use the same coils on my Egos.

But I HAVE noticed, tested, and confirmed - somehow, there IS a difference in performance (perhaps it's the speed at which the coil's going to heat up?) Bottom line - at the same power (say 8 watts) you still get a difference in vapor and flavor between lower resistance and higher resistance coils.

Try both, decide which you like!

+1 this.

I use carto tank setups and through trial and error I have also found a difference in Vape and flavor using different resistant coils.
It surprised me, but I am finding more flavor and Vape using higher resistance coils. I also find that I can get better flavor and vapor at a lower wattage. That seems to be translating into longer battery life.


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[quatro]

The higher the current draw the lower the batt life, even at the same wattage. Some of the posts are not correct.

 

[generic mutant]

Surely you are going to need more watts to get the same wick temperature anyway with a lower resistance coil, since it has more mass.