New set up and loving it

[jboss10]

What's the recommended ohm to run in a stack configuration?

 

[bx10r]

What's the recommended ohm to run in a stack configuration?
View attachment 109864

Stacks are usuall series so me..id go .3+
But that's me..

Sent from a very cloudy room

 

[gopher_byrd]

What batteries are you running? That is a series mech. The voltage is doubled and current draw would be what the CDR is for a single battery. You do know Ohm's Law? E=I*R so R=E/I If you don't know Ohm's Law you need to learn it. Using Sony VTC5A 25A CDR batteries you could use a 0.33 Ohm coil. I would suggest a 0.4 Ohm coil. With 20A cells 0.42 Ohm. I would suggest using a 0.5 Ohm coil. Those give you a little head room on the batteries.

Paging @r055co for the new mech users post.

 

[jboss10]

I’m currently running a .45 on the Hohm Work batteries.

 

[entropy1049]

Find out the continuous drain rating of your batteries. Using an Ohms law calculator or the formula resistance = voltage divided by current (amps), plug the cdr of a single battery in for current and use 8.4 as voltage. The resulting resistance value can be considered the minimum resistance value at which you should build your coil and still maintain some safety headroom.

Example, with 30 amp continuous draw rated 5 leg iJoy cells, 8.4 volts/30 amps = 0.28 ohm.

Now, recommended? That’s for you to determine. My series builds in a stacked tube I keep as close to the minimum resistance I can build without exceeding CDR. Makes a toasty vape though, and you may prefer something less rowdy.

I use Kanthal in my series builds as well. Kanthal = less coil mass = faster ramp time.

Nice stack btw!

 

[jboss10]

Find out the continuous drain rating of your batteries. Using an Ohms law calculator or the formula resistance = voltage divided by current (amps), plug the cdr of a single battery in for current and use 8.4 as voltage. The resulting resistance value can be considered the minimum resistance value at which you should build your coil and still maintain some safety headroom.

Example, with 30 amp continuous draw rated 5 leg iJoy cells, 8.4 volts/30 amps = 0.28 ohm.

Now, recommended? That’s for you to determine. My series builds in a stacked tube I keep as close to the minimum resistance I can build without exceeding CDR. Makes a toasty vape though, and you may prefer something less rowdy.

I use Kanthal in my series builds as well. Kanthal = less coil mass = faster ramp time.

Nice stack btw!

THANK YOU!! I'm working on a Kanthal build now. Trying for .4 or .35. I just don't get the flavor with the straight round Kanthal build I have in it now.

 

[Fudgey Finger]

That's a sweet mod op. I'm jealous af.

I use Kanthal in my series builds as well. Kanthal = less coil mass = faster ramp time.

I don't understand this part of your post. Kanthal has the slowest ramp up of the 3 main wire types. I use kanthal on my series mods and ramp up is never an issue, but I don't understand how you get less coil mass with kanthal. If anything my kanthal series coils are bigger than if I used n80 because I can use thicker gauges and more wires in parallel.

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[entropy1049]

That's a sweet mod op. I'm jealous af.



I don't understand this part of your post. Kanthal has the slowest ramp up of the 3 main wire types. I use kanthal on my series mods and ramp up is never an issue, but I don't understand how you get less coil mass with kanthal. If anything my kanthal series coils are bigger than if I used n80 because I can use thicker gauges and more wires in parallel.

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Kanthal has a greater wire volume/“footprint” than other wire materials at the same resistance. So if we make a coil for a desired resistance of, let’s say 0.2 ohm, it’s physical mass will be much smaller than a 0.2 ohm coil made of say NiCr80. The reduced wire mass heats up much faster than would the NiCr80 could as the result of its smaller size. It is true that if we took two very small lengths of wire of identical wire masses, one of Kanthal and one of NiCr80 the NiCr80 wire would heat up faster, but they would be different resistances, and the Kanthal would have greater resistance.

In our application, wire mass is a more significant factor in heat flux than is conductivity of the material simply due to the amount of current we’re applying through the circuit path.

 

[strigamort]

That's a sweet mod op. I'm jealous af.



I don't understand this part of your post. Kanthal has the slowest ramp up of the 3 main wire types. I use kanthal on my series mods and ramp up is never an issue, but I don't understand how you get less coil mass with kanthal. If anything my kanthal series coils are bigger than if I used n80 because I can use thicker gauges and more wires in parallel.

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Edit- always a damn day late and dollar short.

The way I understand it, ramp up/down is about mass not resistance.

If you had a target around .27 you'd have (roughly) 4 wraps on a 3mm id using 22g KA1. Same 22g wire only Ni80 instead of KA1 you're going to need about 6 wraps at 3mm id.

You're going to have more metal in the coil using a lower resistance alloy.



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[entropy1049]

The way I understand it, ramp up/down is about mass not resistance.

If you had a target around .27 you'd have (roughly) 4 wraps on a 3mm id using 22g KA1. Same 22g wire only Ni80 instead of KA1 you're going to need about 6 wraps at 3mm id.

You're going to have more metal in the coil using a lower resistance alloy.

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Nailed it.

 

[jwill]

I’m currently running a .45 on the Hohm Work batteries.

.40-.50 are the best for a coolish vape on a series. You can also get away with building a massively dense coil for some serious cloud chasing without working a quality battery cell too hard.

 

[Fudgey Finger]

Kanthal has a greater wire volume/“footprint” than other wire materials at the same resistance. So if we make a coil for a desired resistance of, let’s say 0.2 ohm, it’s physical mass will be much smaller than a 0.2 ohm coil made of say NiCr80. The reduced wire mass heats up much faster than would the NiCr80 could as the result of its smaller size. It is true that if we took two very small lengths of wire of identical wire masses, one of Kanthal and one of NiCr80 the NiCr80 wire would heat up faster, but they would be different resistances, and the Kanthal would have greater resistance.

In our application, wire mass is a more significant factor in heat flux than is conductivity of the material simply due to the amount of current we’re applying through the circuit path.

Ok I never thought of it that way or looked at the heat flux of 0.x ohm ka1 coil vs 0.x ohm n80 coil. I always just assumed that the hurdle of kanthal's higher heat capacity would make it more efficient to use n80 for ramp up.

I just played around in a coil calculator and saw what you mean. I don't usually target a specific resistance, but I try to achieve a resistance that works well for the mass of the coil instead, so I never encountered this. I usually use kanthal on my series mods because it's the only way I can achieve the surface area I want while keeping my resistance within what I can vape.

Thanks for shedding some light on that. I've never looked at it from that angle before.

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