I think we're saying about the same thing worded differently. Were you originally wondering why a dual at 1.5 ohms total resistance (each coil 3 ohms) needs more power applied than to run a single 1.5 ohm coil to get a similar vape?
I was originally trying to figure out the amps to not overtax anything. Looking at electronics equations wasn't getting anywhere because they're not thinking about heat.
Learning electronics math (which doesn't always follow what you'd think it would) I kept coming up with a free lunch, twice the heating area at no cost. So I was wondering where the cost was, I could only see it using ribbon because it took a while to heat up. I really got confused when I went to thinner wire and started treating them as a single coil, until I figured out to crank the wattage up (while reading that thread), then it all clicked. I started seeing the doubled vapor and higher cost.
Just remember ... resistance by itself isn't that meaningful, as you can reach the same resistance in different ways. So if you are not taking into account those ways, the analysis of coil performance will be incomplete.
But when making a comparison between dual and single mixing masses between them makes it more confusing. I think that was part of my original confusion.
And probably is still part of my questioning of the sense of V9 duals vs IGO-L single because I have 32ga in the V9 and ribbon in the IGO. They're probably basically doing the same thing and I need to go more extreme with the V9 dual to make it really shine.
I find it more appealing to run a single coil of thicker wire than to run multiple coils of thinner wire. Lower gauge, thicker wire takes more watts to heat up at a given resistance too. A 1.5 ohm, 32ga coil runs much hotter at 10 watts than a 1.5 ohm, 28ga coil. The 28ga coil needs more watts to heat up the same as the thinner wire, but that heat is spread over a bigger area to increase the vapor like dual coils do. About the same effect, but I only need to wrap and install one coil.
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Overall, me too. But the V9 doesn't seem to do good with any single coil set up I've tried compared to the IGO-L. Lighter dual wires in it gives me a wide range of possible settings which alone is a big plus. When I had dual ribbon in it too low of power wouldn't produce, too high would quickly burn.
Myk's post finally moved my two remaining brain cells to rub together and create a spark and then I realized my mistake.
I could confuse the matter further by bringing into account the added mass, surface area and environmental factors that affect the temperature of the coils and require us to use actually more than double the power , but it's best to just tell people to turn it up until it tastes right...![]()
That's how I felt trying to figure it out. I could only console myself saying that it's not the first time electronics have confused me.
Turning it up until it tastes right is my usual mantra. But if you've never had duals before tasting right would be judged on single coils. I think my new mantra for duals is to either double the wattage and adjust or use voltage and treat it like a single coil and adjust. My usual with the V9 dual set up I'm liking is a little lower than double. I can go over double but I'm not sure if the Vamo is giving all it says it is that high with a single 18650.

