That is why I asked. I assumed that to be the case with regulated mod, and from what I'd been reading, but I wanted the question asked for ppl that run by this thread.
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That is why I asked. I assumed that to be the case with regulated mod, and from what I'd been reading, but I wanted the question asked for ppl that run by this thread.
SirRichardRear
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what is the formula used to come up with that amp draw?
For a regulated mod, the full equation is Watts/Minimum single battery voltage/number of batteries/mod efficiency, or as @SirRichardRear posted -
P(watts)/V(nominal voltage)=I(amps). Same thing, just remember it is INPUT voltage though, not the voltage displayed on your mod what is going to your atomiser.
You can use the nominal voltage too as outlined here, but using cutoff voltage gives the maximum amp draw possible, kind of like using 4.2V for a mech even though that never actually hits your atomiser.
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so if you were vaping on a regulated mod with 2 batteries at 80 watts it would be 80/3.7/90%? how is mod efficiency measured?
SirRichardRear
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with 2 batteries the voltage goes up to 7.4 and if the chip is 90% efficient (which is pretty standard) then it would be 80/7.4/90% or 12 amps
i don't usually bother with efficiency for a few reasons. one being that every ship is different, 2 being the efficiency changes per chip based on the output amperage, and 3 we already have extra overhead in our safe guidelines to account for it. but it's totally understandable for people to add in the .9 power factor due to inefficiency better safe then sorry right?
To find the efficiency of the mod chipset you need to find the data sheet on the control board, if there is one availabe. Evolv DNA chips for the most part in their datasheet state 98% efficiency, think I've heard the DNA75 though is like 85 to 90%. But most fall in the 90% efficiency category, that efficiency rating is what the chipset itself pulls to operate and function properly, it is lost power of the electronics, similar in regards to voltage drop when using a mech.
Nearly there, except as you have 2 batteries, it would be 80/3.7/2/0.9=12.01A.
If you calculated this at cut off voltage though, of say 3.1V per cell, it would be 80/3.1/2/0.9=14.33A.
As you can see, at cut off voltage the amp load is over 2A higher in this example, which is why I always calculate at cut off voltage. Especially when some mods cut off is set at 2.8V per cell, the amp load can be quite a lot higher.
Kind of like when you calculate for a mech you use the highest voltage, even though you never actually get that voltage, it is just to be extra safe.
You can also do it the way @SirRichardRear explained, which is what I usually do myself, and use the series voltage, which at nominal would be 7.4V, or cutoff 6.2V, assuming a cutoff of 3.1V per cell (This varies from mod to mod, so you will want to check) and skip the number of batteries part of the equation, it will work out the same.
Check the mods datasheet or instructions for efficiency, the DNA200 is 97% efficient and the DNA75 is stated to be 85% efficient on the datasheets. If you are unsure I usually use 90% myself.
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@SirRichardRear good video and good basic explanation. I think a lot of the confusion comes not only from the variation between mechs vs regulated but with mods like the smok alien which displays info kind of funky. It confused me anyway. I have the istick tc100w which is a bit odd in that it's a parallel regulated mod, most are series. The alien being a 220w mod should be series.
For example on my alien right now I'm vaping at 38w and the readings say 3.775v, .352 ohms and 10.72 amps. Going by the math, 38w/3.7v/2 (series)/0.9 (efficiency) = 5.7a (out of available amp limit of a single 18650 - series, double volts, total amps equal amp limit of single battery). In order to get the amps that are displayed on the mod and using the data displayed, 38w/3.775v/0.94 (playing with efficiency #'s and using 93-94% efficiency which is within possibility) = 10.73 to 10.71a which is what's showing on the screen.
The math pretty much works out within reason but examining the display of the alien mod it looks to be using the batteries as parallel rather than series (which we know is wrong if it's a 220w unit). It would be less confusing if the display showed 38w, .352 ohms, 7.55v and 5.3 to 5.4a. Then users would have a better idea of their battery draw I think. I know there's a difference in what's hitting the atomizer vs what's being drained off the batteries but for those looking at the data in terms of their battery drain the info displayed seems a bit back assward.
Unless I'm wrong I think it's safe to say that inverting the values would give a more accurate assessment of the load. Read the voltage display and double it, read the amperage display and halve it. Not on all regulated mods but at least with this one in particular. I've seen quite a few confused questions come up in terms of battery use with this mod in particular as it's been one of the more popular recent mods and personally it had me scratching my head. It's nice to have a display that makes some sort of sense or why have it.
For example on my alien right now I'm vaping at 38w and the readings say 3.775v, .352 ohms and 10.72 amps. Going by the math, 38w/3.7v/2 (series)/0.9 (efficiency) = 5.7a (out of available amp limit of a single 18650 - series, double volts, total amps equal amp limit of single battery). In order to get the amps that are displayed on the mod and using the data displayed, 38w/3.775v/0.94 (playing with efficiency #'s and using 93-94% efficiency which is within possibility) = 10.73 to 10.71a which is what's showing on the screen.
The math pretty much works out within reason but examining the display of the alien mod it looks to be using the batteries as parallel rather than series (which we know is wrong if it's a 220w unit). It would be less confusing if the display showed 38w, .352 ohms, 7.55v and 5.3 to 5.4a. Then users would have a better idea of their battery draw I think. I know there's a difference in what's hitting the atomizer vs what's being drained off the batteries but for those looking at the data in terms of their battery drain the info displayed seems a bit back assward.
Unless I'm wrong I think it's safe to say that inverting the values would give a more accurate assessment of the load. Read the voltage display and double it, read the amperage display and halve it. Not on all regulated mods but at least with this one in particular. I've seen quite a few confused questions come up in terms of battery use with this mod in particular as it's been one of the more popular recent mods and personally it had me scratching my head. It's nice to have a display that makes some sort of sense or why have it.
SirRichardRear
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The display of the alien shows the output amps of the chip which isn't equal to the amp draw on the batteries.
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I’ve seen Moochs name everywhere and i just started to investigate box mods … only barley a month
and you’re not a fan boi omg … why did they even say that … meanie ….
lol you’re funny… and ill have tons of questions for you… but .. im dead now just from the firmware hahaI don't consider myself a battery expert hence the reason i use moochs ratings for the batteries.
outside of that I work in the power generation field, i have worked on UPS systems, Solar, Generators (including resistive load bank testing), ATS's but my main field is IT and networking. due to being in this field and having many friends in it, I've learned mechanics/engines (work on my own cars), low voltage (phone systems, switch boards etc), electricity (home wiring and industrial wiring) and a few other tricks of the trade.
outside of that though, to be honest all those skills are pretty irrelevant and not needed as all the information i provided is readily available as long as you understand how to read it. I explain that in the video I don't claim to be an expert by any means, however my working knowledge of UPS systems has many similarities to the tech used in regulated mods.
also you can read here http://vapingunderground.com/thread...for-subohm-no-batterries.275951/#post-1375486
where I helped this guy with his design of an A/C plug in mod
SirRichardRear
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Mooch is the battery god when it comes to picking batteries for vapingI’ve seen Moochs name everywhere and i just started to investigate box mods … only barley a month
SirRichardRear
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I'll help the best i canlol you’re funny… and ill have tons of questions for you… but .. im dead now just from the firmware haha
Oh you rock ! You can do itI'll help the best i can
I've seen a few of your videos before coming here thank you so very much ! I love your posts too! And I believe you lol I do !
Oh you rock ! You can do itI'll help the best i can
I've seen a few of your videos before coming here thank you so very much ! I love your posts too! And I believe you lol I do ! Thanks again
Link is broken and what is this store ? I use a good one I found here ?