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RC-11

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May 19, 2015
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So after almost a year of vaping with my Sigelei 150w I've decided to start building my own coils (I know I'm late to the party). Now I've been researching all the necessary info for the past 4 hours (materials needed, Ohm's Law, etc..), but I'm still a little confused about the science-y part of it all. So far, I understand that when building my dual coil setup I don't want to make it below a resistance that exceeds the batteries' amp limit. I use Samsung 25R batteries in my mod, and the Internet says for a Sigelei 150w, the batteries are in series, so (first point of needed clarification) I think that means I can't exceed 20A?

Next point of clarification is how to figure all of this out when my mod is Variable Wattage. That kind of throws a curve ball on the whole V= I*R equation when I'm trying to find I and V changes constantly.

(This is an aside more for people who have or have used the Sigelei 150w, but with every hit or push of the button the voltage reading on the display changes, anywhere from a max of 7.5 volts to a minimum of somewhere between high 4 to low 5. The ohm reading also changes from .3 to .5 but every so often it'll spike up to a random .7 or .9. Is this a common thing with the Sigelei or is it just me? It's been doing this ever since I got the mod but I never thought much of it till just today.)

So how do I find "I" when all I'll have is "R" and a "V" that changes with every hit? And how does increasing/ decreasing the wattage affect that?

Also, I plan on buying 24 gauge Kanthal wire because it seems like a decent size, but how will I know how much resistance it gives off? I mean without an ohm reader, because I heard that those are often unreliable.

Basically this all sprouted from me not knowing what coil building kit to get because I didn't know what materials I needed, because I didn't know how to do it, because I didn't know how it all worked. So it all kinda snowballed into me spending hours trying to research and figure it out, but now I have more questions than before lol. Bottom line, in addition to answers to all the above questions, if anyone knows a good coil building kit that would be great as well :D

Thanks for all the help in advance, I know I probably sound really confused so thanks for bearing with me.
 

MotorcityVapeman

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Mar 14, 2016
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The Motorcity
All of your questions are good ones, and just like you I am about to dive into coil building! But I am not all that worried because I am not going for the wild large watt builds! But there is a awesome website that you can find out what ohm your builds will be, or to help you achieve a certain ohm goal you want.
Here is the link! Coil wrapping
they also have ohm calculators, coil calculators and ejuice calculators!
 

Lessifer

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Is your sigelei a temperature control mod? If so, your resistance and voltage are jumping around because you're in tc mode, which begs the question, are you using a tc coil head?

As for your other questions. Amp draw and resistance are more important if you're using a mechanical mod with fixed voltage. With a variable wattage mod, the voltage adjusts to hit the wattage you want with whatever resistance coil you use. Are you planning to use Kanthal, or one of the TC materials?

If you're running Kanthal, 24g is pretty thick, though not too thick. You'll just have to hit it with some pretty good power to not have lag.
 

RC-11

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May 19, 2015
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Is your sigelei a temperature control mod? If so, your resistance and voltage are jumping around because you're in tc mode, which begs the question, are you using a tc coil head?

As for your other questions. Amp draw and resistance are more important if you're using a mechanical mod with fixed voltage. With a variable wattage mod, the voltage adjusts to hit the wattage you want with whatever resistance coil you use. Are you planning to use Kanthal, or one of the TC materials?

If you're running Kanthal, 24g is pretty thick, though not too thick. You'll just have to hit it with some pretty good power to not have lag.

To be honest I am not sure if the sigelei is a temperature control mod, or if I am using a to coil head. I'm still a bit of a novice when it comes to this :(

And oh okay thank you for clearing that up. I planned on using Kanthal, though I dont really know the differences, I've just seen that most people use it so I decided to as well.
 

Lessifer

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Feb 5, 2013
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To be honest I am not sure if the sigelei is a temperature control mod, or if I am using a to coil head. I'm still a bit of a novice when it comes to this :(

And oh okay thank you for clearing that up. I planned on using Kanthal, though I dont really know the differences, I've just seen that most people use it so I decided to as well.
Kanthal is used for voltage/wattage mode, other materials like nickel or titanium are used for temperature control. Kanthal has a fixed resistance, so a 0.5ohm coil is always 0.5ohm while the temp control coils fluctuate their resistance, and that is how the mod reads the temperature.

I'm not familiar with using a tc mod though, so hopefully someone else comes along to explain how to check which mode you're in.
 

KenD

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Aug 20, 2013
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Coil resistance doesn't determine the amp draw on a regulated mod, watt settings and battery voltage (lower charge = higher amp draw) do. The calculation is:

Two batteries in series, using the full 150w:

165 (150w +10% to account for device inefficiency) / 6.4 (3.2v as the battery cut off voltage) = 25.78 amps

Max watts using 20 amp batteries:

20 * 6.4 = 116.4w (128 / 1.1)

Sent from my M7_PLUS using Tapatalk
 
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edyle

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Oct 23, 2013
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So after almost a year of vaping with my Sigelei 150w I've decided to start building my own coils (I know I'm late to the party). Now I've been researching all the necessary info for the past 4 hours (materials needed, Ohm's Law, etc..), but I'm still a little confused about the science-y part of it all. So far, I understand that when building my dual coil setup I don't want to make it below a resistance that exceeds the batteries' amp limit. I use Samsung 25R batteries in my mod, and the Internet says for a Sigelei 150w, the batteries are in series, so (first point of needed clarification) I think that means I can't exceed 20A?

Next point of clarification is how to figure all of this out when my mod is Variable Wattage. That kind of throws a curve ball on the whole V= I*R equation when I'm trying to find I and V changes constantly.

So how do I find "I" when all I'll have is "R" and a "V" that changes with every hit? And how does increasing/ decreasing the wattage affect that?

Also, I plan on buying 24 gauge Kanthal wire because it seems like a decent size, but how will I know how much resistance it gives off? I mean without an ohm reader, because I heard that those are often unreliable.

Basically this all sprouted from me not knowing what coil building kit to get because I didn't know what materials I needed, because I didn't know how to do it, because I didn't know how it all worked. So it all kinda snowballed into me spending hours trying to research and figure it out, but now I have more questions than before lol. Bottom line, in addition to answers to all the above questions, if anyone knows a good coil building kit that would be great as well :D

Thanks for all the help in advance, I know I probably sound really confused so thanks for bearing with me.

1: " I use Samsung 25R batteries in my mod, and the Internet says for a Sigelei 150w, the batteries are in series, so (first point of needed clarification) I think that means I can't exceed 20A?"
All that matters is whether you trust those batteries for 75 watts each: (75+75=150)

2: "(This is an aside more for people who have or have used the Sigelei 150w, but with every hit or push of the button the voltage reading on the display changes, anywhere from a max of 7.5 volts to a minimum of somewhere between high 4 to low 5. The ohm reading also changes from .3 to .5 but every so often it'll spike up to a random .7 or .9. Is this a common thing with the Sigelei or is it just me? It's been doing this ever since I got the mod but I never thought much of it till just today.)"

It's probably a temperature controlled mod and it's probably in temperature control mode.
Or else you are using an rda and you did not retighten the post screws after dryburning. they tend to loosen after the first install of a coil.

3: "So how do I find "I" when all I'll have is "R" and a "V" that changes with every hit? And how does increasing/ decreasing the wattage affect that?"
You don't need to.

4: "Also, I plan on buying 24 gauge Kanthal wire because it seems like a decent size, but how will I know how much resistance it gives off?"

I'd like to suggest you get some 28 gauge. For practice.
With thinner wire, if you want thicker wire, you can twist 2 or more together.
With thicker wire, you don't have an option to simulate thinner wire
 

RC-11

Full Member
May 19, 2015
24
8
29
Coil resistance doesn't determine the amp draw on a regulated mod, watt settings and battery voltage (lower charge = higher amp draw) do. The calculation is:

Two batteries in series, using the full 150w:

165 (150w +10% to account for device inefficiency) / 6.4 (3.2v as the battery cut off voltage) = 25.78 amps

Max watts using 20 amp batteries:

20 * 6.4 = 116.4w (128 / 1.1)

Sent from my M7_PLUS using Tapatalk

1: " I use Samsung 25R batteries in my mod, and the Internet says for a Sigelei 150w, the batteries are in series, so (first point of needed clarification) I think that means I can't exceed 20A?"
All that matters is whether you trust those batteries for 75 watts each: (75+75=150)

2: "(This is an aside more for people who have or have used the Sigelei 150w, but with every hit or push of the button the voltage reading on the display changes, anywhere from a max of 7.5 volts to a minimum of somewhere between high 4 to low 5. The ohm reading also changes from .3 to .5 but every so often it'll spike up to a random .7 or .9. Is this a common thing with the Sigelei or is it just me? It's been doing this ever since I got the mod but I never thought much of it till just today.)"

It's probably a temperature controlled mod and it's probably in temperature control mode.
Or else you are using an rda and you did not retighten the post screws after dryburning. they tend to loosen after the first install of a coil.

3: "So how do I find "I" when all I'll have is "R" and a "V" that changes with every hit? And how does increasing/ decreasing the wattage affect that?"
You don't need to.

4: "Also, I plan on buying 24 gauge Kanthal wire because it seems like a decent size, but how will I know how much resistance it gives off?"

I'd like to suggest you get some 28 gauge. For practice.
With thinner wire, if you want thicker wire, you can twist 2 or more together.
With thicker wire, you don't have an option to simulate thinner wire

Oh ok I think I'm starting to understand. So basically it doesn't matter what resistance my coils are? It all just depends on what setting my wattage is on?

Edyle, also, I googled whether or not the sigelei 150w that I have is temp control and it isn't, and I also tried to tighten the screws a bit but the numbers still are jumping around. Do you have any other idea of why it may be doing this? And what are the different effects of a 28 gauge of 24 gauge? Thank you for your help
 

KenD

Vaping Master
ECF Veteran
Aug 20, 2013
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Stockholm, Sweden
kennetgranholm.com
Oh ok I think I'm starting to understand. So basically it doesn't matter what resistance my coils are? It all just depends on what setting my wattage is on?

Yes, exactly. Note though that the maximum and minimum voltage the mod can put out affects the maximum and minimum watts that are possible with a particular resistance (for example, if the resistance is 1 ohm and the maximum voltage is 9v you can't get more than 81w, and if the minimum voltage is 2v and the resistance is .2 ohms you can't go lower than 20 watts).

Sent from my M7_PLUS using Tapatalk
 

edyle

ECF Guru
ECF Veteran
Verified Member
Oct 23, 2013
14,199
7,195
Port-of-Spain, Trinidad & Tobago
Oh ok I think I'm starting to understand. So basically it doesn't matter what resistance my coils are? It all just depends on what setting my wattage is on?

Edyle, also, I googled whether or not the sigelei 150w that I have is temp control and it isn't, and I also tried to tighten the screws a bit but the numbers still are jumping around. Do you have any other idea of why it may be doing this? And what are the different effects of a 28 gauge of 24 gauge? Thank you for your help

dryburn the coil, and immediately after dryburning, tighten the screws.


24 gauge needs more power per ohm to run than 28 gauge;
with 24 gauge you will also tend to end up with much lower ohms than if you use 28 gauge.
I just think that based on what you said, you will find 28 gauge easier to learn with than if you just jump straight to 24 gauge.
 
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