Coil help...please
- Thread starter newhunter
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A 28 gauge dual parallel coil build at 1.5Ω with 20 watts... will have a "cold" heat flux of only 59 mW/mm². You need to use either thinner wire, more wattage, build as a single coil only... or with a dual build, a much lower resistance.
As you don't have more wattage, that's out, as is a much lower resistance due to the MVP limiter. The easiest is either a single coil at 1.5Ω, or obtain some thinner wire.
As you don't have more wattage, that's out, as is a much lower resistance due to the MVP limiter. The easiest is either a single coil at 1.5Ω, or obtain some thinner wire.
- Built as a single coil, heat flux rises to a nicely warm 237 mW/mm².
- Using 32 gauge wire with a dual coil, heat flux is 238 mW/mm².
There ya' go, Leon. ;-)
On a 2.0mm mandrel, it will be a 10 wrap, on a 2.5mm mandrel, a 9 wrap... both with 4mm+/- total leg length to terminals.
If you get a chance for a bit of reading... refer to my two sigline hyperlinks below.
Cheers
Interesting that the new 20-watt MVP will not fire under 1.0 ohms. My MVP 2.0 will fire down to 0.8 ohms, although it is fairly useless because of the very low voltage required to stay under the 3.5 amp current limit.
I know the specs for the 20-watt version say 1.0 ohm minimum, but have you tried going lower?
I know the specs for the 20-watt version say 1.0 ohm minimum, but have you tried going lower?
Hey ya' EMT...
Most of the 11 watt MVP2s will "fire" down below the resistance to amperage parity point... but as you determined, the available output current isn't enough to support below the advertized limit of 1.2Ω.
The imposed 1.0Ω lower limit with the MVP 20-watt is kinda odd... considering what the output amperage is. I don't have one to play with, so I haven't had opportunity to comprehend the logic.
Perhaps innokin feels that run time is more important than the ability to support a lower resistance value.
8 or 9 wraps around a 3/32 drill bit will give you 1.4 to 1.6 ohms respectively. Those are TIGHT wraps and the finished coil heated with a torch and squeezed together. Then placed on your atty and fired and squeezed again, No wick in the coil when doing the initial firing and squeezing on the atty.
With that ohm coil, depending on the airflow, wicking material and juice thickness, 12 to 15 watts should be good. 20 watts might be a little high and give you a burnt taste. Only testing will tell.
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