Dual-Coil on 5V?

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Killjoy1

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Dual coils are fine at higher voltages due to the info posted above (they're two higher ohm coils in parallel). You will get less battery run-time per charge due to this, though. Since the total resistance is lower, it will draw more amps. For example the dual coil, or any other 1.5 ohm item, will draw 3.3 amps @ 5v, while a single coil 3 ohm will only draw about 1.7 amps @5v. Since battery capacity is measured in milli-amp hours, theoretically you would get 50% more run time with the single 3 ohm coil vs the 1.5 ohm dual coil.

But just ignore the geek-speak and go ahead and use them. Dual coils vape great at higher voltages and are well worth a little less battery life IMHO :) Higher voltage won't hurt the carto at all unless you vape it dry, but that'll kill any carto at any voltage so it's not anything new to the equation ;-)
 

VapoVamp

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Dec 21, 2011
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Morning KillJ, You explained it perfectly....I did'nt think about the amparage drain, I just didn't want my box to....? Well I'm not sure that's why I asked my ECF vapefreaks. I knew I'd get an education :toast: Thanks again, your my favorite geek for simplifing it for me. See you in the Vapehaze:vapor:
Dual coils are fine at higher voltages due to the info posted above (they're two higher ohm coils in parallel). You will get less battery run-time per charge due to this, though. Since the total resistance is lower, it will draw more amps. For example the dual coil, or any other 1.5 ohm item, will draw 3.3 amps @ 5v, while a single coil 3 ohm will only draw about 1.7 amps @5v. Since battery capacity is measured in milli-amp hours, theoretically you would get 50% more run time with the single 3 ohm coil vs the 1.5 ohm dual coil.

But just ignore the geek-speak and go ahead and use them. Dual coils vape great at higher voltages and are well worth a little less battery life IMHO :) Higher voltage won't hurt the carto at all unless you vape it dry, but that'll kill any carto at any voltage so it's not anything new to the equation ;-)
 

CraigHB

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Jul 31, 2010
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You need to know the maximum current your mod can handle.

A 1.5Ω carto at 5V pulls over 3 Amps. That's a lot, too much for anything that uses a single cell. A series dual cell mod can power one if it uses a switching regulator. Otherwise, a standard regulator will probably overheat even if the batteries can handle it.

There are output limitations for protected batteries. People use IMR batteries to get around current limitations, but I would recommend against it since they are not protected. You can use an IMR cell safely in a mod that has the additional electronics required, but it's only the higher end mods like the Pro-Vari, LavaTube, etc. that have it.

Sorry for the techy stuff, but if you want to do things that are not standard, there are certain things you need to be aware of regarding the capability of your mod. It can be a matter of safety.

If you tell me what mod you are using or if it's custom, what battery configuration and regulator it uses, I can tell you its current limits.
 
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DaveP

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Read it with a volt-ohm meter. It should read 1.5 ohms, meaning that it is wired in parallel. If so, it will reduce your battery life as opposed to a 3 ohm atty. 3 ohms at 5v gives you about 8 watts, which is considered to be a nice vaping level. Since the power is halved between the two coils in a dual coil, it should be fine, although the battery sees a 1.5 ohm load. The power on each is not what a single coil would produce in terms of heat. Each coil will get 1/2 the voltage and produce half the power.
 

CraigHB

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If the coils were in series, then each coil would see half the voltage. However, that's not the case. For parallel coils, the current and thereby the power is doubled. Assuming an ideal source, voltage does not change on each coil regardless of how many coils are in parallel. Each coil consumes 8.33W (5V2/3Ω) so there is 16.7W total demand on the battery. That's not to say it's the same as running two single coil cartomizers. The difference there is due to the physical characteristics of the configuration, not the electrical ones.
 
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