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Thread: A simple wattage chart showing the relationship between voltage and resistance

  1. #1
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    A simple wattage chart showing the relationship between voltage and resistance

    I don't get to this sub-forum as often as I would like, but I noticed there's always a few questions about voltages and resistances.

    What's wattage? Wattage is a measure of power. It is determined by both the input voltage and the resistance of your coil.

    In simple terms, for personal vaporisers it determines how hot your coil gets, and thus has a direct impact on the amount of vapour you're producing, so it's a good idea to understand this concept. There's a lot more factors involved in optimal vapour production, but I won't get into those right now.

    Below is a wattage chart, there are many like it on the internet, but this one is mine (a bit tarted up for public consumption).

    Full res version here: http://i.imgur.com/6oraBGI.png




    Here's a few pointers to explain how this is relevant for a few different user groups...

    Joye eGo users:
    • Joye eGo batteries have a regulated output of 3.3V, meaning that the output voltage can't be changed. Therefore in order to change your wattage you have to change to a coil of higher or lower resistance.
    • Clearos and cartos designed for eGos will typically range from 2.2Ω (5 watts) to low resistance 1.6Ω (6.8 watts).
    • It is not advisable to use less than 1.8Ω with Joye eGo batteries, otherwise you will begin to compromise the life of your battery.

    Variable Voltage users:
    • The best advice is to dial up to taste. Start at the minimum voltage your device can provide, usually 3.0V, and the incrementally increase the voltage until you are happy with the vapour production.
    • Generally, if you are using a clearo or carto, you will end up somewhere between 5 and 10 watts. If you are using a rebuildable, you may find yourself somewhere in the range of 8 to 13 watts.

    Variable Wattage users:
    • Well you're just all sitting pretty aren't you? No need to look up charts huh? Just dial in your watts and bang on any old atomizer huh?
    • Wrong. I've got another chart for you which I'll come back and post later.

    Mech Mod users:
    • No regulation... living life on the edge eh?
    • You should already be familiar with these concepts, but if not go through them again.
    • I'll might discuss C ratings later, but that may be a little advanced for the New Vapers Forum.



    Additional topics

    Wattage - you are here now
    Joye eGo and regulated output

    Vaporisation Theory - The Simple View
    Vaporisation Theory - The Complex View: The Coil & Air Flow
    Vaporisation Theory - The Complex View: The Wick
    Vaporisation Theory - The Complex View: The Juice
    Amperage Theory
    Amperage Theory - Vamo, Smok Zmax v2, SVD, Provari v2 (coming soon)



    If you're a new vaper (or old one) with a few questions about voltages and resistances, leave your questions here and I'll try to get to them over the weekend.

    More experienced vapers, also feel free to chime in with your experiences.
    Last edited by luntingsir; 22-10-13 at 12:49 PM.
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  2. #2
    Jas
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    your spot on mate with the wattage thing "just set it and leave it" i bet if you set your device to 11W and wack a brand new 1.5ohm coil on there something very unpleasant will happen if you know what i mean? POP POP!! burn burn! VV IMO is just as simple if not easier and gives you a less of a chance to fry your toppers. IMO alot of vapers get brain washed in "it has to be VW" Well no it doesent... it can be VV, very easy to know your voltage based on your resistance, doesnt take any longer to dial in your voltage then to dial in your " set it and leave it Wattage and never have to touch it ever again no matter what i put on my device"
    Last edited by Jas; 20-07-13 at 01:48 AM.
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  3. #3
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    I think I'm going to add bits and pieces to this thread as time goes on. I haven't got any sort of plan, just slapping things down on paper as I go.

    The next instalment covers an important feature of eGo devices.

    Joye eGo and regulated output

    eGo-style batteries are a popular starting point for vapers who are looking to improve on cig-a-likes. They provide a decent battery life, and have a little chip in them that provides a nice little set of features including regulated output, amp limitation, low voltage protection and overcharge protection.

    For the purposes of this particular discussion about wattage, let’s focus on the regulated output.

    All batteries have a nominal voltage. For common AA batteries it’s 1.2V. However as you can probably guess from the charts, 1.2V isn’t going to give us the greatest vaping experience. That’s why virtually all personal vaporisers use a lithium-ion battery. Unlike your typical AA battery which has a nominal 1.2V output, lithium-ion batteries have a nominal 3.7V output, which much better suits our needs.

    The word “nominal” just means what it says on the label. Batteries fresh off the charger actually start at a voltage higher than their nominal value, and will decrease to a voltage lower than their nominal value before they die. For lithium-ion batteries, the safe operating range is actually 4.2 to 3.4V.

    This is where voltage regulation is kicks in.

    Let’s say you’re using a 2Ω clearo. If you were vaping with an unregulated PV with a fully charged battery you’d start out at 4.2V, which gives you 8.8W. As the battery is used during the day, it will slowly decrease to 3.4V, which gives out 5.5W. As you can guess, because of the decreasing voltage the performance drops dramatically during the life of the charge. In order to combat that, the eGo has a chip which regulates output to 3.3V, meaning that for the large part, your output is consistent at 5.2W throughout the day. You may be asking why this trade-off for lower voltage is better. It’s because when you’re starting out with vaping it’s more about consistency than total output.

    Remember, if you want to bump up your performance you can always change to a clearo with a lower resistance. For example, changing to a 1.8Ω clearo will give you 6.1 watts of power, and because of the regulated output, you’ll get that all day.

    To work this out for yourself, refer back to the wattage table above. Because of the regulation in eGo devices it’s a real doddle. The only row you need to be concerned with is 3.3V (I’ve even put an arrow in there for you to make it foolproof). Now read across the resistances to 1.8Ω and you can see that it will give you 6.2 watts of power. Increase your resistance to 2.2Ω and you get 5W. Easy


    Additional topics
    Wattage
    Joye eGo and regulated output
    - you are here now
    Vaporisation Theory - The Simple View
    Vaporisation Theory - The Complex View: The Coil & Air Flow
    Vaporisation Theory - The Complex View: The Wick
    Vaporisation Theory - The Complex View: The Juice
    Amperage Theory
    Amperage Theory - Vamo, Smok Zmax v2, SVD, Provari v2 (coming soon)
    Last edited by luntingsir; 22-10-13 at 12:49 PM.
    margyb, Jas, lheamfrg and 1 others like this.
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  4. #4
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    I run it this way, it's what personally works for me:

    VV I add 2 volts to the ohms as I was sick of looking at a chart. Usually gives you about 8 watts. Adjust up or down according to taste.

    VW I start at 8 watts and adjust up and down according to taste.

    Mech mod I usually build about a 1.5 ohm coil and everything seems OK. Smaller batteries like 14500, 18350 or 18500 seem to work fine with lower ohm builds on BDA/RBA.

    Just my 2 cents worth, plus GST
    Mr Mischief, Jas, lheamfrg and 3 others like this.

  5. #5
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    Quote Originally Posted by Juzm View Post
    VV I add 2 volts to the ohms as I was sick of looking at a chart. Usually gives you about 8 watts. Adjust up or down according to taste.
    Heh. Never realised how good an approximation that is. I'll be sure to steal it when I write up the VV section
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    Brilliant chart, thanks for the info luntingsir.

    Do you know if clones like my first starter kit have the "smart chip" in them?

    Based on their blurb I am guess they don't offer everything but I am glad they have the overcharge protection.
    "A fully charged eGo K 1100mAh battery can work at 4.2v and last 1200 puffs at most. When the battery power decreases, the battery output voltage will decrease. The battery will stop working at 3.0v. Each battery comes with overcharging protection."

  7. #7
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    Hi Malikada,

    All devices (excluding mechanical mods) has some sort of electrical circuit built into them with varying levels of features, including yours. However as you have guessed, the eGo K doesn't have voltage regulation built into its chip, meaning that the power will decrease during the day. But it does appear to have low voltage protection and over charging protection, which if you had to choose, would be the minimum features for safety's sake.

    To give you a bit of history, Joye was one of the first companies to mass produce PVs. Their most successful model, which dominated the market for some time was the eGo. Due to its success, the device, its form factor and even name has been appropriated by cloners. So this can make it a bit hit and miss when assessing various devices on quality and features. One of the features often dropped to keep the cost down is the voltage regulation.

    If you've only recently started vaping you may, or may not, be concerned about the power drop off. If it is becoming an issue for you, then you could start to look at regulated eGos or variable voltage devices (where you can manually adjust the regulated voltage supplied to the coil).

    Now, keep in mind that there are also clones which are made by reputable companies like Vision and Smoktech, which are arguably just as good, if not better, than Joye's product. Understandably both these and the original eGos will cost more, so it's up to you as to whether its worth the extra cash.
    margyb and Malikada like this.
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  8. #8
    Noe
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    Quote Originally Posted by Malikada View Post
    Brilliant chart, thanks for the info luntingsir.

    Do you know if clones like my first starter kit have the "smart chip" in them?

    Based on their blurb I am guess they don't offer everything but I am glad they have the overcharge protection.
    "A fully charged eGo K 1100mAh battery can work at 4.2v and last 1200 puffs at most. When the battery power decreases, the battery output voltage will decrease. The battery will stop working at 3.0v. Each battery comes with overcharging protection."
    Hi Malikada.
    My first kit was a Riva 1100mah set, these batteries worked in the same way as the eGO K/Q batteries. I prefer them over Joye eGo's because they are unregulated & hit harder when fully charged, until they drop down in voltage & need to be recharged, which unsurprisingly is around the point that a Genuine eGo is regulated to.
    I find the genuine eGos do not hit hard enough for me because of that low volt regulation, they are ok as a back up but I would rather use my 2.5 year old Rivas than a brand new eGo.
    Malikada likes this.
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  9. #9
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    Quote Originally Posted by luntingsir View Post
    Heh. Never realised how good an approximation that is. I'll be sure to steal it when I write up the VV section
    I've found 1.5-2v on top of resistance works well no matter what device
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  10. #10
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    OK, question time. From what I can tell most mech modders like very low ohm coils from what I can gather. Scuse me if I'm wrong.

    I build higher ohm coils between 1.5 and 2.2 ohms for a longer draw on mechs.

    Low ohm coils (Approx 1 ohm or sub ohm for example) on mech mods taste like burnt shit to me unless I'm just pulsing the button like I would whilst oxidising a coil.

    Some input on this from the community and the OP would be greatly appreciated because you're such a great bunch.
    lheamfrg, luntingsir and Samtron like this.

 

 
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