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You MUST never build it too low, but what about higher ohm?

Discussion in 'Unregulated (Mechanical) Mods' started by Astray, Mar 9, 2018.

  1. Astray

    Astray New Member

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    Hi, as I am learning extensively and diligently about safety, ohm's law, battery quality and performance, coil building, resistance, battery's amp discharge rate (from the famous Mooch), and the whole realm of unregulated mod safety rules... I have a good understanding on the minimum ohm that would be safe for my single battery 18560 (currently using Sony VTC 5A) unregulated squonk mod. (i have not build it yet as i still need suggestions from this forum)

    But, I have yet to acquire the knowledge on how high can I build the resistance. No, I'm not asking 1+ ohm, but more on the realm of 0.3 - 0.7.
    Would having ohm at that rate have any impact on the vaping experiences (could and/or flavor)?

    Please do enlighten me and thank you!
     
  2. bx10r

    bx10r Gold Contributor Member For 1 Year

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    On my single 18650 mod (pulse) i build at .15
    I build .3+ on my dual 18650 series mods i think .3+ would be too high on a single..imo
    My TS is currently at .13 and its a chucker. I only use ni80 wire btw

    Sent from my SM-G950U using Tapatalk
     
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  3. Fudgey Finger

    Fudgey Finger Silver Contributor Member For 1 Year

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    The only time too high is a problem is on some regulated mods that will only fire as high as 3 ohms, 1.5 ohms, etc.

    On an unregulated mod they only problem will be that the vape sucks. There are people who build really high, but they are using devices that are designed for it. 0.3 can be ok for a single coil, but for dual coils that would be a really weak vape on a single 18650.
     
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  4. gbalkam

    gbalkam Gold Contributor Member For 2 Years ECF Refugee Reddit Exile

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    Using ohms law, a 0.50 ohm coil will give you 27.3 watts power, so you would have to build very small coils, probably 28g or higher. Keeping in mind, the only way to send more power to the coil (to run larger coils) is to reduce the resistance and thereby increasing the wattage and amps draw.
    0.25 ohm = 55 watts
    0.15 ohm = 91 watts.

    www.steam-engine.org/ohm.html
    and
    http://www.steam-engine.org/coil.html

    will help with calculations and how much power you need to run your coils at the level you prefer.

    4 wraps of 28ga kanthal (dual coil) on a 2.5 id core gives 0.40 ohm and 27w power. (or 4 wraps (2 strand parallel build), single coil) which is useful for small RBA mini decks.
     
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  5. Astray

    Astray New Member

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    What battery do you use? 0.15 is worryingly low for me lol

    i do using that site as my guide and also purchased an app for when i'm out.
    So, please correct me if i'm wrong, what i understand is if my preferred vape wattage is at around 90, that would mean that i probably wouldnt like if my build only produce 55 watt?
     
  6. bx10r

    bx10r Gold Contributor Member For 1 Year

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    Vtc4 And lgs...

    Sent from my SM-G950U using Tapatalk
     
  7. YodaTheJuggalo

    YodaTheJuggalo Silver Contributor Reddit Exile

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    You can find battery safety charts online. Zamplebox has one that seems legit.
     
  8. bx10r

    bx10r Gold Contributor Member For 1 Year

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    I run my mechanical squonks like my tubes..

    Sent from my SM-G950U using Tapatalk
     
  9. YodaTheJuggalo

    YodaTheJuggalo Silver Contributor Reddit Exile

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    I use Vtc5a's and LG HG2's for my tube mechs. Best batts I've used so far
     
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  10. Fudgey Finger

    Fudgey Finger Silver Contributor Member For 1 Year

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    0.15 is just barely too low to stay in the CDR of a VTC5a at 4.2v. If you also factor in voltage sag 0.15 is within the CDR.

    The part about your preferred wattage is kind of correct. If you took your daily driver that was running at 90w and then moved it to a regulated mod and set it to 55w, you probably wouldn't get a good vape. The thing is though, in order to go higher in resistance without switching wire materials, you use smaller wire (or add wraps). 55w on some coils will burn your wick. It all depends on what kind of device you are using. Small MTL devices may use really thin wire with small coils and will give a warm vape at 15w.

    I hope this helps illustrate why using a preferred wattage doesn't help much when discussing different coils, except to get a very rough idea of the type of vape a user likes.
     
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  11. YodaTheJuggalo

    YodaTheJuggalo Silver Contributor Reddit Exile

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    Google battery resistance charts. There are tons of them
     
  12. YodaTheJuggalo

    YodaTheJuggalo Silver Contributor Reddit Exile

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  13. gbalkam

    gbalkam Gold Contributor Member For 2 Years ECF Refugee Reddit Exile

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    Right. You want to use that site to plan your coils. Get an idea where you like to vape.. cool to very warm. Cool would be about 270 heat flux, very warm 450+. Next you need to plan your CDR.. lets say it is 0.15 ohm on a 30A battery. This will also give you your max watts. Use that to plan your coil build. Maybe something like 28ga dual core (x2). Its something you have to figure out per your build and battery. But yeah, if you use a build that you usually vape at 90w you would find it very weak at 55w.
    Good news is, you don't actually use watts to determine a set "preferred" wattage (vape). It changes from coil to coil. Example.. on a small 0.3 ohm coil, 90 watts would be way to hot, while on a 0.12 ohm coil, it would be really cold.

    The main thing I want to mention at this point is you may be putting stress on your batteries at some point, 0.12 will stress a 30A battery, so always use brand name (Samsung, Sony, LG) batteries. These have been tested and rated by manufacturer with legitimate data. So you know they aren't a factory 2nd rewrap claiming 45A 3000man. We recommend these brands because we know what they will do if they hard short or heat up. Like.. we know they will vent if you abuse them to much, or get a hard short, but we also know they will not blow up... Your mod might, if it doesn't have proper vent holes, but the battery will vent out and not go POP.
     
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  14. r055co

    r055co VU Donator Platinum Contributor Member For 2 Years

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    Where I Generally vape at usually on 317L SS fused Claptons or with series Kanthal usually unless I'm on a series deck

    Single battery and Parallel Mods
    18650 Sony VTC5A around
    • =< 22mm Atty 0.19Ω
    • =< 25mm Atty 0.15Ω
    iJoy 26650 around
    • =>30mm Atty 0.13Ω
    Series Mods
    18650 Sony VTC5A around
    • =< 22mm Atty 0.6Ω
    • =< 25mm Atty 0.5Ω
    iJoy 26650 around
    • =>30mm Atty 0.4Ω
     
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  15. AlittleFoggy

    AlittleFoggy New Member

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    maybe practice building on a regulated mod, just to see all the info such as volt draw, amp draw, etc... so you can dial in your preferred vape, (or wattage i guess).
     
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  16. Zohmbiebuilds

    Zohmbiebuilds Silver Contributor

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    Most batteries can handle .2 and up so long as it's parallel or single.

    I would say that as long as your not chain vaping, or putting yourself at risk by not being safe and letting that button go for more than 5 to 6 second ( I don't know about anyone else but 4 second is a good pull. Most of my pulls are no longer than 3.)

    Don't be scared to ask questions. In this case the only stupid questions are the ones never asked, that explode with shrapnel.

    Sent from my Z981 using Tapatalk
     
  17. gbalkam

    gbalkam Gold Contributor Member For 2 Years ECF Refugee Reddit Exile

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    sony 30A 2000Mah for 0.15
    Lg 20A 3000 mah for 0.20

    Check both out using ohms law. Both are at listed CDR.
    The actual math for 0.15 ohm is 24.87A at 3.7V at 91W. Truth be told, using the batteries we recommend, would be fine on both the sony and lg batteries.

    What a lot of people fail to recognize is that the CDR is not a detonation limit. The batteries do not blow up if you hit 31A on a 30A battery. CDR stands for constant discharge rate, or the amount of amps you can pull from a fully charged cell until it becomes fully depleted, without over heating. So lets say you get 1 hour of vape time on a 30A battery. You are not going to hold the fire button in for 60 minutes. You are going to press it for 2 to 6 seconds. Then stop. Now as we know, the longer you pull current from a battery, the warmer it gets, and the higher the current you pull, the faster it heats up. CDR mainly come into play when a mod is fired accidentally or the button sticks. This affects the amount of time you have to un-stick the button or stop the mod from firing before it reaches venting temperature. The lower the ohm build the higher the amp draw and the faster the cell heats.
    Now all that being said, we always tell new users to stay within the batteries cdr limit, until they learn enough about building, ohms law, the internal chemistry of each of the cells we use, how fast or slow they heat under load, and what to do in case of venting. In other words, for each battery, you should know how long it takes to heat to 100C, how long you can press fire button for and how long a rest between puffs is enough to allow the cell to cool enough to stay below 100C (usually we stay under 70C as a safety net- being the point were we stop vaping because the battery is getting hot)

    Just a side note... with the recommended batteries we use, the main cause of explosions is not actually the battery. It is improper ventilation in the mod. So if the battery vents, the gas has no place to go inside the mod and BOOM.. just like an egg in a microwave.
     

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