Wattage and ohms

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Samthejuicemane

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I looked at a chart for my sigelei 100 watt and at .2-.5 ohms it can achieve 100 watts. Wouldn't it be a no brainier to use the highest ohm possible for an amount of wattage? I know that the higher ohm you use the less juice is used. But if it is the same wattage would it burn the juice all the same? I'm just figuring out the best way to get the most out of my juice at high wattage. I normally don't vape at 100 watts only when to impress my friends. My sweet spot is around 60.
 

readeuler

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With variable voltage/wattage, throw resistance out the window after you decide where it needs to be to push 100 watts. A thought experiment:

A 1/4 wrap of 34 gauge (thanks, "RBA's are dead" thread :)) or 9 wraps of 24 gauge around a 2mm bit will both clock in around 0.5 ohms. The 34 gauge will be scorching hot, and vaporize almost no juice.

You've got to work smarter, not harder, than the piece of metal. :p
 
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JeremyR

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A wider coil will burn more juice. But there are limits and other factors involved.

For you sig100 it will only be possible to achieve 100w at .2-.5 . That's the only way it can produce that much power but will be limited by how low on wattage it can go at that ohms.

Find out what ohm range it can produce 60w at and then build a coil(coils) to fit those specs. This is where you'll find your best vape at 60w
 

Samthejuicemane

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With variable voltage/wattage, throw resistance out the window after you decide where it needs to be to push 100 watts. A thought experiment:

A 1/4 wrap of 34 gauge (thanks, "RBA's are dead" thread :)) or 9 wraps of 24 gauge around a 2mm bit will both clock in around 0.5 ohms. The 34 gauge will be scorching hot, and vaporize almost no juice.

You've got to work smarter, not harder, than the piece of metal. :p

I think I understand, but just to clarify; a 34 gauge with a .5 ohm read at 100 watts would use less juice and produce the same ammount of vapor as 24 gauge with a .5 ohm read at 100 watts?
 

ScottP

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To me the sweet spot is about 8 wraps of wire per coil. When building for a target wattage you should first understand the voltage and current (amps) limitations of the device. From that figure out the acceptable resistance range required. Next determine coil diameter of what you are wrapping around and adjust the gauge of wire that you are using so that @8 wraps yields the a resistance within the target range.

Download the tool in my sig if you have an Android device, it can help with theory crafting your coils.

EDIT: It is usually not a good idea to push anything to it's absolute limits. Even though it is rated for 100W, pushing it to that edge may shorten the lifespan of the product.
 
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JeremyR

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whats the highest gauge to go for 100 watts which would be suitable?

28g parallel coil would probably be my choice for a single coil build at .4 - .5 ohms It will heat much faster than single 24g. 6-7 wraps parallel will be 12-14 wraps total but it will heat 25% faster at ~.5 ohms ( this will also work if your doing a dual coil rather than parallel)

I only run at 25 watts and use parallel 32 for 1.4 ohms. It heats much faster with more vapor than 28g at 1.4.

32g parallel is my favorite at 24w & 1.4 ohms (due to mod limitations)



Beats this 28g, 1.4 ohm at 24w



This will be like you running the 24g up against the 28g parallel or dual.
 
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rusirius

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I think I understand, but just to clarify; a 34 gauge with a .5 ohm read at 100 watts would use less juice and produce the same ammount of vapor as 24 gauge with a .5 ohm read at 100 watts?

Since I didn't see anyone else mention it... "use less juice and produce same amount of vapor"... That's an oxymoron... Vapor is juice... vaporized... To get more of it you have to use more juice. There's no getting around that.

When deciding how to build your coils there are two things that many people never mention nor pay attention to... Heat flux and heat capacity.

Heat flux is how much heat is being released in a given surface area. If you take the same gauge wire and do two coils, one at say 4 wraps and one at 8 wraps. You obviously have less surface area on the 4 wrap coil. If you run them both at the same power then you've got a much higher heat flux on the 4 wrap. If your heat flux is too low then you won't produce much vapor. If your heat flux is too high, then no matter how much airflow you have the coil won't stay cool resulting in burnt wicking and destroying the flavor of your juice.

The other side of the equation is heat capacity. If I build one coil with 6 wraps of 30awg and another with 12 wraps of 26awg, there is a lot more wire in the 12 wrap coil. Not just because of more wraps, but because of the heavier gauge wire. This means there is a much higher heat capacity. This means it will take longer to heat up at a given power level, and retain heat longer after power is killed versus the 6 wrap coil.

So in the end you're trying to balance everything. You want to build in the area that best suits the wattage you want to run. To do that you want the maximum amount of surface area (within reason and wicking ability) with a nominal heat flux and lowest possible heat capacity. Balance all those out and you'll find your sweet spot.

As for using less juice? The only way to do that is to make less vapor... and that is a function of power. The less wattage the less juice.
 
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