dripper wattage

Discussion in 'General Rebuildable Discussion (RTA/RBA/RDA)' started by The flavor chase, Jan 29, 2017.

  1. The flavor chase

    The flavor chase New Member

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    I put my Velocity RDA on Smoke Alien running dual claptons 26g/32 at .23ohms. I've been playing with it all day at 50watss I dont get any flavor and at 70 it taste burnt. my batteries died so I swapped them out with new ones. I didnt realized it set the wattage to 220watts surprisingly the flavor at 220watts although very warm was phenominal. What wattage would you guys vape this build at? and is 220watts on these dual claptons safe to vape at?
     
    Last edited: Jan 30, 2017
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  2. gakudzu

    gakudzu Gold Contributor Member For 2 Years

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    0.023? :eek:
    Or did you mean 0.23?

    Also, what batteries are you using? It's generally recommend to stay under 150w for dual 20A.
     
  3. gobbly

    gobbly New Member

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    Yep, is that a typo or the real resistance? Remember that wattage is just voltage * amperage. Your mod will typically know ohms law and keep you from doing something stupid, but it's not a bad idea to read up on it yourself.
     
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  4. The flavor chase

    The flavor chase New Member

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    typo lol .23 ohms
    im using lg hg2 batteries
     
  5. gobbly

    gobbly New Member

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    Ohm tells me that for 220w @ 0.23 ohm you're pulling just over 30 amps @ ~7v.
    Your battery is rated for 20 amps continuous discharge.
    Even @ 150w, which is the highest I would bother with for a 2x18650 mod, you'd still be over 25 amps. Since Wattage is just vols*amps, if you can increase the resistance you can push more wattage without increasing the draw.
    You can get batteries rated to 30a or 40a continuous discharge, but I can't tell you if you're mod would take advantage of them. It may assume ~20a as a max.

    Though your mod *should* prevent you from overdrawing the batteries, I wouldn't suggest tempting fate by running that high regularly. Even with regulated mods it's a good idea to stay within relatively safe parameters.

    I can't say for certain, but I suspect what is going on is that your mod is pulsing (or lowering the wattage and not informing you), and that your 220w is effectively much lower. If it's pulsing, you may not find that perfect spot, as it's really a combination of powers (though you may be able to come close). If it's just lowering the wattage to a fixed value, you should be able to find that value, may just take some trial and error if you don't know how the algorithm to limit is designed.

    Keep in mind I'm not experienced with your mod, so what I'm saying above is general info, it errs on the side of caution and should be good for any mod really.
     
    Last edited: Jan 30, 2017
  6. SirRichardRear

    SirRichardRear AKA Anthony Vapes on Youtube VU Donator Diamond Contributor Member For 3 Years Reviewer

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    in general keep it under 150 watts for dual 18650 devices using 20 amp batteries.
    If you wanted to use 200 watts for some reason just get a triple device. with that said see below
    in reality according to DJLSB testing with that resistance the mod will only be putting out about 166 watts. still a little too high IMO for those batteries but he should be fine with some sony VTC5a batts
     
  7. gobbly

    gobbly New Member

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    I found a table on their site with broad numbers, but don't think that's what you're referencing. Closest match on that table is 6.2v @ 124W for a 2x20A (https://www.djlsbvapes.com/chose-batteries/). Where are you finding the testing info? Do they have similar for other mods?

    So to the OP, the numbers I gave are the general physics at play. The info Sir Richard is giving is specific to how that particular mod behaves when taxed. That may give you a baseline to see if you can locate a setting that is close to where you felt the vape was perfect. Don't neglect Richards advice on batteries. Lean to use an ohms law calculator.
     
    Last edited: Jan 30, 2017
  8. SirRichardRear

    SirRichardRear AKA Anthony Vapes on Youtube VU Donator Diamond Contributor Member For 3 Years Reviewer

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    your calculating the battery amp draw on a regulated mod suing ohms law which is incorrect. the calculation for amp draw on batteries in regulated devices is I=P/V (amps = Power Divided by Voltage)
    so at 150 watts using nominal voltage it would be 150/7.4= 20.2 amps thats why some say 130 watts for 20 amp batteries so when they are close to dead (say 3 volts each) 130/6 - 21.6 which yes is a little over but realistically the device won't likely put out the 130 watts with dead batteries. that also doesn't factor in efficiency. I'd recommend OP checks out this video i made (and you can too if you wanted more info)
     
  9. gobbly

    gobbly New Member

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    hmm. I'm not clear how I=P/V differs from P=IV, but yeah, it's certainly a directly proportional relationship.
    Edit: I'll watch your video for sure!
     
  10. SirRichardRear

    SirRichardRear AKA Anthony Vapes on Youtube VU Donator Diamond Contributor Member For 3 Years Reviewer

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    it doesn't. it's the same formula. (p=I*V is the same as I=P/V) I just write it that way as the 2 known constants are Power (watts) and Voltage. we use it to calculate the amp draw on batteries in regulated device. using P=I*V is basically 150=X*6(dead batteries in series for example) so you still need to divide 150 by 6 to solve for X and get 25. If your gonna vape at 150+ watts in a dual battery regulated device i recommend the sony VTC5a personally
    i was replaying to your 1st line of "Ohm tells me that for 220w @ 0.23 ohm you're pulling just over 30 amps @ ~7v."
    where really he would be pulling 26 amps on a full charge or 36.6 amps on nearly dead batteries. you don't factor resistance when calcualting the amp draw on your batteries in regulated mods ;)
     
  11. gobbly

    gobbly New Member

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    Right. As long as you can adjust voltage you can adjust amperage independent of power.

    I gotcha!

    I did close my post with a warning that my info was general to apply to any mod and err on the side of caution. You had me worried that there was some crazy change in physics I wasn't aware of!
     
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