Posting this here just in case anyone else finds it useful:
Recently I had some discussion on a Thai vape forum about trying to establish a rough power at which self built coils on an rda / rta would be almost certain to give a burnt coil or wick. I had looked at all variations of ohms law and online resources such as Steam but they were all focussed on filling in an unknown variable when you know 2 other parts of the equation. Nothing about "at what power is it pretty certain you will get a burnt coil / wick from overheating". Can't do it by watts because 20w on one build might be the same as 100 on another. Resistance also can't be used. The only other advice I found, which of course IS correct, was start off low and work up to a flavour you like. But I still thought there must be SOME general guideline you can use as an upper limit, like a red line on a rev counter, to be be sure your build won't burn.
I was pointed in the direction of volts by a helpful poster on the Thai forum who said he worked on setting the mod to draw max 5 volts, just as a rough guide. 5v I find works for me too but, at least with the builds I'm using at the moment, while I can go up to 5v, I find it borderline too hot and too sweet (with fruit juices) so I have settled on 5v as being the absolute maximum (like a red line on a rev counter) but tend to find the max for me is around 4/4+ (into the amber), with a few builds vaping well even at 3+. Of course I might not always want to vape drawing as high as 5 volts, it just gives a good starting point as an upper limit guide.
I find the 4-5v guideline really useful when I'm changing tanks or putting in a new build, a quick press of the fire button will immediately show the volts being drawn and whether I need to drop the wattage down or raise it to get within the safe zone for vaping or bedding the coils in (which I do at way below the power they might ultimately be able to take but at a power that's not so low it has zero heating effect).
I did originally think the equation wouldn't work well with clearo coils where the manufacturer, in my limited experience, stamps the recommended wattage range on the coil along with the resistance. At the moment though, I'm trying one of those rated at 0.8 where iLeaf have the wattage at 30-100. I've taken it to 50 and seriously, beyond that I'm sure it would burn, but I guess that will depend on the juice but I really can't see how you could vape them at even close to 100!! I'm guessing the upper is more of a safety limit than something you would wish to vape at. At the moment I find I'm vaping it at about 4v for the best flavour, so maybe it does work after all.
Be interested to see if anyone is using builds where the guideline falls down, aside from clearo tanks using the cartridge drop-in coils.
Recently I had some discussion on a Thai vape forum about trying to establish a rough power at which self built coils on an rda / rta would be almost certain to give a burnt coil or wick. I had looked at all variations of ohms law and online resources such as Steam but they were all focussed on filling in an unknown variable when you know 2 other parts of the equation. Nothing about "at what power is it pretty certain you will get a burnt coil / wick from overheating". Can't do it by watts because 20w on one build might be the same as 100 on another. Resistance also can't be used. The only other advice I found, which of course IS correct, was start off low and work up to a flavour you like. But I still thought there must be SOME general guideline you can use as an upper limit, like a red line on a rev counter, to be be sure your build won't burn.
I was pointed in the direction of volts by a helpful poster on the Thai forum who said he worked on setting the mod to draw max 5 volts, just as a rough guide. 5v I find works for me too but, at least with the builds I'm using at the moment, while I can go up to 5v, I find it borderline too hot and too sweet (with fruit juices) so I have settled on 5v as being the absolute maximum (like a red line on a rev counter) but tend to find the max for me is around 4/4+ (into the amber), with a few builds vaping well even at 3+. Of course I might not always want to vape drawing as high as 5 volts, it just gives a good starting point as an upper limit guide.
I find the 4-5v guideline really useful when I'm changing tanks or putting in a new build, a quick press of the fire button will immediately show the volts being drawn and whether I need to drop the wattage down or raise it to get within the safe zone for vaping or bedding the coils in (which I do at way below the power they might ultimately be able to take but at a power that's not so low it has zero heating effect).
I did originally think the equation wouldn't work well with clearo coils where the manufacturer, in my limited experience, stamps the recommended wattage range on the coil along with the resistance. At the moment though, I'm trying one of those rated at 0.8 where iLeaf have the wattage at 30-100. I've taken it to 50 and seriously, beyond that I'm sure it would burn, but I guess that will depend on the juice but I really can't see how you could vape them at even close to 100!! I'm guessing the upper is more of a safety limit than something you would wish to vape at. At the moment I find I'm vaping it at about 4v for the best flavour, so maybe it does work after all.
Be interested to see if anyone is using builds where the guideline falls down, aside from clearo tanks using the cartridge drop-in coils.
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