Variable Voltage and Low Ohm Coils

Discussion in 'Reos Mods' started by rasci2, Jul 13, 2013.

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  1. rasci2

    rasci2 Super Member Verified Member ECF Veteran

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    I my love my VV Grand and the fact that I can set the voltage and get a consistent vape throughout the life of the batteries.
    I also love vapeing low ohm coils on the Grand.

    My question is this. Why don't they design VV chips that can accommodate coils that are less than 1 ohm?
     
  2. pdib

    pdib Registered Supplier - Offline ECF Veteran

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    I think its just that they don't need to. Plenty of market for the (i assume less expensive to manufacture) present versions.

    Also, tho, when you mix higher amp limitations with buyer's choice on batteries, your running a big risk. Something that has limits @ 2-3 amps isn't going to cause cheapo batteries to explode (very often).

    Personally, I'd love to see that. Maybe a 10 amp limit.
     
  3. unloaded

    unloaded Ultra Member Verified Member ECF Veteran

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    The DNA will do 20 watts. Rob keeps talking about some new models coming. Maybe this is in the works?!
     
  4. vapdivrr

    vapdivrr Vaping Master Verified Member ECF Veteran

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    love the idea of the dna-20 chip set, been waiting for this for a while. but these so far have only been put together in a box mod. a tube mod version is coming out, I believe its called the cyborg, and before buying a reo I was on the waiting list for one of these mods. but now im not so sure I would buy it for I like the reo more and find a tube mod a little less attractive. I would however purchase a dna-20 reo for sure.
     
  5. Justice

    Justice ECF Guru Verified Member ECF Veteran

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    Why do low ohms with the VV when you can up the volts with more coils give the same result with more vapor. More coils will give more heating area giving more vapor
     
  6. pdib

    pdib Registered Supplier - Offline ECF Veteran

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    So, with the builds I've been doing lately, I guess I'm at about 32 Watts . . . . .

    (That's putting my .5Ω coil in the calculator @ 4 volts, to compensate/round. Even @ 3.8v, it's almost 29 watts)

    I guess I would still prefer the freedom of a mech. and a good battery. (call me old-school)
     
  7. Justice

    Justice ECF Guru Verified Member ECF Veteran

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    I use my mechanical mostly so can relate in that respect but the OP posted "variable voltage and low ohm coils"
     
  8. pdib

    pdib Registered Supplier - Offline ECF Veteran

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    Which doesn't exist . . . . . . . so, . . . . . . . . . . I got half the topic? No?



    I mean, someone mentioned the DNA20 going up to 20 watts, and I replied that 20 watts isn't enough. Perhaps I wasn't explicit, sorry.
     
  9. rasci2

    rasci2 Super Member Verified Member ECF Veteran

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    I mean, someone mentioned the DNA20 going up to 20 watts, and I replied that 20 watts isn't enough. Perhaps I wasn't explicit, sorry.[/QUOTE]

    Agreed 20 watts is not enough. I don't think the DNA20 is the answer. What I would like to know is there an electrical reason why current VV Mods cannot use low ohm coils and why is there a wattage limitation.
     
  10. ChrisEU

    ChrisEU Super Member Verified Member ECF Veteran

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    The DC-DC converters used in the common VV and VW mods are mass produced for all sorts of things. They are usually amp-limited to 1.5 or 2.5 ampere.
    Now there are two types: The ones that pump up the voltage first and then hack it down to the selected voltage (These are used in mods that use a single battery) or those that can just lower the voltage, but not boost it (Those are used in mods with stacking batteries).

    The type with stacking batteries may be able to put out the 30 or so watts you crazy people want, but the chip would be larger. The reason for that is two fold: efficiency of the chip and size of the internal printed connectors.

    Those circuits have about 90% efficiency, which means that there will be >3 watts heat (at 30 watts) heating up the tiny little chip. That is a lot. Then, imagine a tiny wee little silicone piece that needs to control 30 watts with a printed connection smaller than a hair.

    Rob might be able to tell more, but the VV REO chip might actually be able to handle a sub ohm coil, but I am guessing it is amp limited (and thus resistance limited) to warn about shorted atomizers.
     
  11. Navy4life

    Navy4life Senior Member Verified Member ECF Veteran

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    Nice explanation ChrisEU.
     
  12. ChrisEU

    ChrisEU Super Member Verified Member ECF Veteran

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  13. unloaded

    unloaded Ultra Member Verified Member ECF Veteran

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    The way these micro coils mimick sub-ohm setups I'm think you might be able to get one set up at 20 watts and get results similar to a SLR 30-35 watt setup. Just a hunch but it wouldn't suprise me if it happens.
     
  14. rasci2

    rasci2 Super Member Verified Member ECF Veteran

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    Great explanation. Thank you.
     
  15. vapdivrr

    vapdivrr Vaping Master Verified Member ECF Veteran

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    for the most part I probably do vape over 20 watts with .7Ω being my average resistance, sometimes a little higher, sometimes a little lower, but I would still enjoy a 20 watt dna chip. it would be nice just to be able to get that constant voltage for a longer time. I know there is no real difference because all you have to do is just pop in a new battery and bobs your uncle, but I would still buy one if one were to happen in a reo.
     
  16. speedy

    speedy Full Member

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    we just need better batteries! come on nanotechnology batteries!!!
     
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