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Dual coils on provari doable?

Discussion in 'ProVari' started by Dominick0311, Oct 9, 2013.

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  1. Dominick0311

    Dominick0311 Super Member ECF Veteran

    Aug 27, 2013
    Long beach
    Had a dual coil fire last night but I destroyed one on accident tightening the finicky little trident post caps lol.
    13/14 wraps of 30g kanthal each coil was 2.7-2.8 ohms.
    Thanks for the help guys :)
     
  2. HolmanGT

    HolmanGT Vaping Master Verified Member ECF Veteran

    Jul 2, 2013
    St. George, UT USA
    Dominic,

    First sorry to hear you damaged your RBA but all is not necessarily lost.

    Did you kill the termination post, can it be replaced?

    Also if you use 32 or 34 Ga. wire you won't have to use so many turns. I'll bet 13/14 turns gets a little tight in such a small area.

    If you need I can give you a link to purchase the wire... and it is really cheap.

    By the way if you stripped the threads in the terminal post you may be able to re-thread it and use a slightly larger screw.

    PS - you can probably find someone to do the re-threading for you. Most folks are not going to have those kind of tools just laying around the house.
     
  3. Dominick0311

    Dominick0311 Super Member ECF Veteran

    Aug 27, 2013
    Long beach
    Got your pm before I saw your reply, I didn't strip anything, the screw driver slipped into the center of my coil and smooshed it lol.
    Btw I'm wrapping micro coils so 13 wraps ends up small and fits pretty nicely


    Sent from my iPhone using Tapatalk - now Free
     
  4. Dominick0311

    Dominick0311 Super Member ECF Veteran

    Aug 27, 2013
    Long beach
    If anyone wants to post pictures of their working dual coils on their provaris I think that'd be cool. Exclusively on provaris though so this thread doesn't end up in the rebuildables.
    Once I get settled in and have time I'll build another and post pics of mine


    Sent from my iPhone using Tapatalk - now Free
     
  5. HolmanGT

    HolmanGT Vaping Master Verified Member ECF Veteran

    Jul 2, 2013
    St. George, UT USA
    Dominic,

    You just made my day... I was so concerned that you stripped the terminal post.

    If the 30 Ga. is working for you and the wick has breathing room between each coil wrap I would stick with it. The 32 & 34 are a little more fragile but manageable. But if the 30 Ga. works don't fix it.;)
     
  6. Dominick0311

    Dominick0311 Super Member ECF Veteran

    Aug 27, 2013
    Long beach
    Lol nah man I wouldn't even be posting on here, I'd be in the bathroom at USO crying


    Sent from my iPhone using Tapatalk - now Free
     
  7. Dominick0311

    Dominick0311 Super Member ECF Veteran

    Aug 27, 2013
    Long beach
    Finally got a good one
    13/14 wraps of 30g 1.3 ohms
    [​IMG]
    [​IMG]


    Sent from my iPhone using Tapatalk - now Free
     
  8. StarsAndBars

    StarsAndBars Ultra Member ECF Veteran

    Jul 13, 2010
    Colorado
    Negative. I see people posting all the time that running two coils halves the resistance. It doesn't. Running two coils doubles the amperage. Mathematically it works out about the same, but just know what the actual effects of dual coils are. When your multimeter reads 2 ohms on a dual coil, each coil is 2 ohms, which equals a total of 2 ohms.

    For example: running two coils of 2 ohms each in parallel doesn't make it a one ohm circuit. It would still be a 2 ohm circuit, but draw twice the amperage.

    So voltage, divided by 2 ohms, times 2.
     
  9. tom_chang79

    tom_chang79 Senior Member ECF Veteran

    Aug 4, 2013
    CA
    From the perspective of the battery or in Provari's case, output of the switcher, it's 1-Ohm with two 2-ohm coils in parallel. The fact that it draws twice the current tells you the total system resistance got halved. The coil's resistance, individually does not change. If the coils are identical, then the current would be split amongst each path...
     
  10. StarsAndBars

    StarsAndBars Ultra Member ECF Veteran

    Jul 13, 2010
    Colorado
    Sorry man but that is incorrect. The current isn't split, the current (amperage) is doubled (same current, but times two). This is why the Provari often won't fire dual coil. Have 2 coils douples the amp load. I don't have a pro vari but imagine it has an amp limitation, as do most mods (if not all) that aren't mechs.

    More importantly nothing is halved. A pair of 2 ohm coils in parallel would equal 2 ohms, not 1. At 4 volts, that would be 4 amps.
     
  11. TheSystemHasFailed

    TheSystemHasFailed Ultra Member ECF Veteran

    Apr 19, 2013
    Valhalla
    The micro coil guys will love you.
     
  12. Rob S.

    Rob S. Senior Member ECF Veteran

    Apr 23, 2012
    Darien, Connecticut
    ?

    Product over the sum formula.

    Two 2 ohm coils in parallel.


    Resistance total = 2 x 2 / 2 + 2

    = 4 / 4

    = 1 ohm





    Sent from my HTC One using Tapatalk now Free
     
  13. Technonut

    Technonut Vaping Master Verified Member ECF Veteran

    Oct 11, 2010
    East Coast, USA
  14. Dominick0311

    Dominick0311 Super Member ECF Veteran

    Aug 27, 2013
    Long beach
    Then tell me how my two 2.8 ohm coils meters out to 1.4 ohms?
    It's not theory bro, it's fact. It seems everyone in here is on the same page but you.



    Sent from my iPhone using Tapatalk - now Free
     
  15. tom_chang79

    tom_chang79 Senior Member ECF Veteran

    Aug 4, 2013
    CA
    V = I*R , where V is volts, I is current, R is resistance.

    If I is doubled, R must be halved, to maintain same V

    You are confusing individual path resistance with total (network) resistance...
     
  16. HolmanGT

    HolmanGT Vaping Master Verified Member ECF Veteran

    Jul 2, 2013
    St. George, UT USA
    StarsAndBars,

    Not to prolong this debate if you would take a look here. It shows how to calculate parallel resistance and will actually calculate it for you. Your method of getting to the answer comes out right but the method it wrong.

    This is door number 1:

    Parallel Resistor Calculator R1 + R2 = equivalent resistor R resistance equiv total resistor finder made easy - sengpielaudio Sengpiel Berlin
     
  17. Dominick0311

    Dominick0311 Super Member ECF Veteran

    Aug 27, 2013
    Long beach
    So now that that has been cleared up... Lol
    Anyone else running dual coils on their provaris? I'd like to see some pics :)


    Sent from my iPhone using Tapatalk - now Free
     
  18. tom_chang79

    tom_chang79 Senior Member ECF Veteran

    Aug 4, 2013
    CA
    I think we deviated from the original topic...

    I think dual coil would totally be doable, but not at a two single-coil performance of what we usually subject our RDA or RBA.

    I usually run my RBA at about 10-12W. If true dual coil RBA were to be experienced, we need at least 20-24W (25 to be conservative).

    With Provari's 15W limit, it would mean max of 7.5W per coil, which is generally where I vape my clearo...

    Doable? Yes. Enjoyable? Depends. Making a coil glow is not a sign it'll work good. The coil gets quenched in juice and the amount that it can overcome the quenching of the juice depends on more power.

    The only vv/vw mod that can do 20W is the DNA 20...

    Would be cool if Provari did a 20W-30W mod in the future... The draw back of creating such mod is, making sure your customer doesn't use lesser battery with higher internal R.

    Two batteries with the same discharge rating can have different internal R (you see it everyday even when you have the same make/brand/capacity battery, varies from unit to unit) but they will definitely heat up at different rate...

    The advantage of integrated battery (in e-cig world) over replaceable, like in the Provari, is that the connection of the battery to the PCB is stronger (less resistive), when pulling 4 to 6A from a 3.7V cell, push contact and spring contact will start to not be an attractive solution...
     
  19. Dominick0311

    Dominick0311 Super Member ECF Veteran

    Aug 27, 2013
    Long beach
    Scroll up on this same page and you'll see my dual coil build from last night.
    Doable... yes
    Enjoyable... YES

    1.4 ohms @ 4.4 volts
    Steaming away, flavor punch to the mouth

    Sent from my iPhone using Tapatalk - now Free
     
  20. HolmanGT

    HolmanGT Vaping Master Verified Member ECF Veteran

    Jul 2, 2013
    St. George, UT USA
    Tom,

    30 Watts - that would require a battery at a mean level of 3.7 volts to supply 8 Amps - Ouch!

    I'm not sure a car battery would fit in my ProVari or any of my other APVs -:)
     
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