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What voltage and Resistance...the Safe Vaping Chart
sej016 Offline
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Post: #11
RE: What voltage and Resistance...the Safe Vaping Chart
(16/07/12 02:34 PM)McAldo Wrote:  Well, the resistance of each coil is considerably higher than the combined resistance, so for getting the same wattage on each coil as you would from an equivalent resistance single coil, the voltage will need to be considerably higher.
And the battery will need to provide enough amperage for the job, of course.

I still have a stash of triple coils and no mod to run them properly Smiling
I think each of the two coils will be twice the combined resistance, since they are normally wired in parallel? So a 1.8 ohm dual coil will be two 3.6 ohm coils in parallel.

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16/07/12 04:36 PM
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daytona Offline
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Post: #12
RE: What voltage and Resistance...the Safe Vaping Chart
Total resistance = 1/R1 +1/R2 etc etc
16/07/12 04:54 PM
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sej016 Offline
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Post: #13
RE: What voltage and Resistance...the Safe Vaping Chart
Wasn't the whole point of dual coils and LR carts to get greater performance at lower voltages, instead of going for a VV device an having to wind up the voltage on an SR cart?

Steve J
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16/07/12 04:55 PM
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sej016 Offline
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Post: #14
RE: What voltage and Resistance...the Safe Vaping Chart
(16/07/12 04:54 PM)daytona Wrote:  Total resistance = 1/R1 +1/R2 etc etc

No ...... 1/Total R = 1/R1 + 1/R2........

Steve J
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16/07/12 04:59 PM
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daytona Offline
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Post: #15
RE: What voltage and Resistance...the Safe Vaping Chart
(16/07/12 04:55 PM)sej016 Wrote:  Wasn't the whole point of dual coils and LR carts to get greater performance at lower voltages, instead of going for a VV device an having to wind up the voltage on an SR cart?
No.
It was to give a larger heating surface than a straight forward single coil LR carto.It doesn't get hotter or pull more power total resistance is total resistance and the power isn't any different. If you had two in series to start with and converted them to parallel, then the wattage would change as the full voltage would reach each resistor, in series you lose some across the first resistor.
16/07/12 05:05 PM
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daytona Offline
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Post: #16
RE: What voltage and Resistance...the Safe Vaping Chart
(16/07/12 04:59 PM)sej016 Wrote:  
(16/07/12 04:54 PM)daytona Wrote:  Total resistance = 1/R1 +1/R2 etc etc

No ...... 1/Total R = 1/R1 + 1/R2........

Edit. I see what you meant now. I did say etc etc instead as to much information,it's not going to achieve anything
(This post was last modified: 16/07/12 05:09 PM by daytona. )
16/07/12 05:07 PM
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sej016 Offline
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Post: #17
RE: What voltage and Resistance...the Safe Vaping Chart
OK... It's a bit clunky discussing DC theory on a text forum, so I'm going to drop it.

I have conceded your point that the chart is not strictly applicable to multi-coil devices and have qualified it so.

I'll leave it there.

Steve J
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16/07/12 05:36 PM
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maccafan Offline
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Post: #18
RE: What voltage and Resistance...the Safe Vaping Chart
The problem with dual coils is the current limiting issue and the C rating of the battery ie., getting the coils hot enough for a satisfying vape because the total current and therefore the wattage is halved per coil..So while the battery may be putting out a 2.2 amp draw each coil will be getting only 1.1 amps and each coil will be heating up like a 3.2 ohm SC cart on a 3.5 volt battery. This poor performance was the reason for Provari upping their amp limit because performance on 1.5 ohm dct's was poor with the V1's 2.5 amp limit.

A 1.5 ohm dual coil on at 3.5 volts will not hit as hard as a 1.5 ohm single coil..Flavour may be better with a cooler vape. I have seen that chart on ECF before and it was posted in 2010. Password is "Kayla" if anyone wants to remove the protection and look at the conditional formatting formula..

İmage

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16/07/12 06:02 PM
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Onceupon Offline
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Post: #19
RE: What voltage and Resistance...the Safe Vaping Chart
Well, I successfully vape at around 15 watts using a DCC on my 5 volt, 3 amp box. I was simply pointing out that the chart would suggest that this is a no-no.

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18/07/12 03:31 AM
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maccafan Offline
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Post: #20
RE: What voltage and Resistance...the Safe Vaping Chart
(18/07/12 03:31 AM)Onceupon Wrote:  Well, I successfully vape at around 15 watts using a DCC on my 5 volt, 3 amp box. I was simply pointing out that the chart would suggest that this is a no-no.
I think it was agreed that the chart was applicable to SC's only.

I was merely posting that the chart is very old and was made when there were no DC or TC attachments and also opining that on DC's and TC attachments, a normal mod/battery would give up long before you hit unsafe limits unless it it's a custom twin LiPo territory mod like breaktru or some of the other electronic gurus produce. Smiling

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18/07/12 06:01 AM
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