MOD and Coil Ohm Question

[AzrielProne]

I have recently purchased a K100 (Empire Knock-Off) Mechanical mod with an AW IMR 18490 battery. I am running a Cobra Rebuildable Atomizer tank. I have 30 Gauge Kanthal Wire and have it running at 1.1 Ohms

I want to know what a safe Ohm for this set up and batter would be. I am new and love how it hits but I am a little paranoid as I have heard of batteries blowing and such.

If anyone has any insight and links please do let me know.

Thanks!

 

[Smitty6094]

I'm interested as well

 

[bris1974]

You are fine. with that setup you are pushing 3.36 amps and 12.44 watts. your well under the amp limit for that battery.

 

[AzrielProne]

Great! Thanks for the info!

 

[kiwivap]

I have recently purchased a K100 (Empire Knock-Off) Mechanical Mod with an AW IMR 18490 battery. I am running a Cobra Rebuildable Atomizer Tank. I have 30 Gauge Kanthal Wire and have it running at 1.1 Ohms

I want to know what a safe Ohm for this set up and batter would be. I am new and love how it hits but I am a little paranoid as I have heard of batteries blowing and such.

If anyone has any insight and links please do let me know.

Thanks!

Use ohms law here. Running a 1.1 ohm coil at 4.2 volts (completely charged battery) - 16.036 watts, 3.818 amps. An AW IMR 18490 at 1100 mah can handle up to 4.8 amps. If your mah is lower than that please say so - it will change the battery capacity here.

When the battery drop to 3.7 volts, - at 1.1 ohms - 12.445 watts, 3.363 amps.

An 18650 with more mah would be the safest, but an 18490 with the right mah is ok. You need to watch the voltage as you go so you don't over-discharge the battery. If you want the safest ohms - stay within the limits of your battery.

 

[RudeBoy007]

I found a link on this site to a chart that shows acceptable ohms/resistances to voltages; I will try to paste it here (I have trouble pasting links in these posts)...

Safe Vaping Power | Voltage | Resistance | Ohm Chart

 

[kiwivap]

I found a link on this site to a chart that shows acceptable ohms/resistances to voltages; I will try to paste it here (I have trouble pasting links in these posts)...

Safe Vaping Power | Voltage | Resistance | Ohm Chart

That's a helpful chart for variable voltage vapers who don't want to blow coils and need to match ohms. Its set up as a guide for single coils. It doesn't indicate the safe limits for battery drain though.

 

[AzrielProne]

Use ohms law here. Running a 1.1 ohm coil at 4.2 volts (completely charged battery) - 16.036 watts, 3.818 amps. An AW IMR 18490 at 1100 mah can handle up to 4.8 amps. If your mah is lower than that please say so - it will change the battery capacity here.

When the battery drop to 3.7 volts, - at 1.1 ohms - 12.445 watts, 3.363 amps.

An 18650 with more mah would be the safest, but an 18490 with the right mah is ok. You need to watch the voltage as you go so you don't over-discharge the battery. If you want the safest ohms - stay within the limits of your battery.

Thanks for all the details. I do have an AW IMR 18490 3.7v 1100mah high drain battery in there now.

 

[AzrielProne]

I have built another coil on my new AGA-T2 tank. This time it is a Double Wick (coil per each wick). The Ohm for it is 1.0 with 30g kanthal. Still on the AW 18490

Can anyone let me know if this is safe and or how to use the Ohm calculator correctly so I can see. I would assume it is fine at 1.0 Ohm...just not 100% since there are 2 coils now if that changes anything.

Thanks.

 

[Iusedtoanalog]

Hi Azriel, Is that 1Ω a measured resistance at the 510 connection? If so just plug your numbers into the calculator and see what you come up with >
http://www.the12volt.com/ohm/ohmslawcalculators.asp If you have a final load of 1Ω then your amperage should be right at 3.7amperes of draw. I use the same cells and seem to remember them being safe up to 8C of constant output but I would not suggest trying to run them up that high anywhere near your face....... the math works (I believe)like this 1100mAh=1.1Ah......1.1Ah*8c=8.8A of output available from that specific cell....... The word "safe" means different things to different folks, In a flashlight, no big deal if something fails.... in a mod near your face, Really Really big deal if something fails..... I would not advise a load that would require more than five amperes of current from those cells, and even that is "iffy" because when I ask them for 3.7A of output those cells get warm under heavy vaping......

 

[AzrielProne]

Thanks. Yes, the 1.0 Ohm was measured with a multimeter at the 510 connection once both wicks and coils were assembled and finished. So that would be the same as 1 coil at the same 1.0 Ohm, yes? I know that would be "safe" for a single coil, but I didnt know if something else would factor into it with two coils running.

 

[aPandaz]

AW IMR 18490 1100 mah has an 8c rating giving it an 8.8 amp limit. This means the lowest you can go, not accounting for voltage drop in the mod, is 0.47ohm.

 

[CloudZ]

Thanks. Yes, the 1.0 Ohm was measured with a multimeter at the 510 connection once both wicks and coils were assembled and finished. So that would be the same as 1 coil at the same 1.0 Ohm, yes? I know that would be "safe" for a single coil, but I didnt know if something else would factor into it with two coils running.

The same amount of power and current will be going through the circuit, but it will be divided between the two coils. The difference in the vape is up for interpretation. One fact is that the dual coil will run cooler and be less likely to burn anything, but it will have more surface area, which may make up some/most/all/more vapor and flavor. In conclusion, it is just as safe, but it may not be helping anything. Or it might. I don't know


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[AzrielProne]

Thanks Everyone. That is great info and def helped!

 

[HughDaHand]

If you are using a multimeter to get your ohm rating make sure you are zeroing out your meter. Take the leads and touch them together and note the reading. This number needs to be subtracted from any readings you do. I have a craftsman meter that reads 0.7 on just the leads, that could lead to some dangerous coils if I didn't take these steps.

 

[sdogre]

Where do you find the power ratings for your batteries, example 8c?

 

[CloudZ]

Where do you find the power ratings for your batteries, example 8c?

Some are easier to find than others. Usually it will be on the manufacturers website or some retailer's listing. The only numbers you can trust are probably from the more reputable brands like Panasonic, AW, Samsung, etc.
The c-rating is basically a maximum safe amperage. For those who don't know, you take the number in the c-rating and multiply it by the capacity in amp-hours (not milliamp hours, divide by 1000) to get the safe amp limit.

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