What voltage do you guys build for?

[AngeNZ]

I know a lot of you here have been using mech mods for a long time. I'm only 5 months into building for a mech or unregulated protected mod.

I'm interested in what voltage you guys/gals build for, and why

I've been building for 3.8v, as that seems to work for my lower wattage vaping (0.45-0.7ohm)

Edited to add: I'm using either a Molicel p26a (25A) or a Samsung 30q (15A) 18650 battery. So I know that at 4.2v with a 0.45-0.7ohm coil, I'm only using a max of 9.3A and below from my battery

 

[T0mmy1977]

That sounds reasonable.

 

[mimöschen]

I build my atties so I can vape 'em comfortably from 3.8V down to 3.3V resting voltage.

 

[Blitzdonlife]

Around 20-25 Watts normally on an unregulated or mechanical 18650 mod.6-.7 Ohms lands me in that range from 4.2 to 3.7V. I don't blow huge clouds with a single 18650 mech (it's doable, but I don't), so that works for me. I use a dual battery or 21700 regulated mod and lower resistance dual coils if I want big clouds.

 

[Zaryk]

I always calculate my coils with 4.2v. That makes it so I know the max possible amp draw for that coil and lets me keep a margin of safety. Single 18650s I stick with .20-.22 ohms. With a single 21700 I do .16-.17 ohms. I drain my battery to 3.6v.

 

[AngeNZ]

I always calculate my coils with 4.2v. That makes it so I know the max possible amp draw for that coil and lets me keep a margin of safety. Single 18650s I stick with .20-.22 ohms. With a single 21700 I do .16-.17 ohms. I drain my battery to 3.6v.

I'm glad you put that in - I've been typing without a brain over this past week
I edited my first post to add my batteries, and ohm's law calculations.

 

[Don29palms]

I use dual Killer coils in everything. I only use 20S, 2070C or 30T batteries. Whenever I calculate Ohms Law I use 4.2 volts. Knowing there is going to be some voltage drop is a little built in safety. Stacked/series mods are another story.

 

[bombastinator]

Back in the day before DL it was about 8. Then DL came along and I got up to 35w. Lately it’s been around 12-15w

 

[vaper1960]

So I'm building this vape "hookah" using a 12 volt tractor battery and massive dual coils (OK... just kidding... thought you all could use a laugh) carry on...

 

[bombastinator]

So I'm building this vape "hookah" using a 12 volt tractor battery and massive dual coils (OK... just kidding... thought you all could use a laugh) carry on...

I’ve actually got a gigantic mechanical variable voltage inverter that works off wall power that I’ve been meaning to turn into a hookah for years. Maybe I’ll get around to it. Thing weighs like 40 pounds or something . It’s huge.

 

[CagedSpam]

Been running .6 single coil or so for awhile. The Vandy Vape Pulse has a bit of volltage drop so works well for my 14mm RDA's.

Tried running .4 SS dual coils with Tengu RDA, works but a pretty cold vape and a bit thin on vapor production.

Hope that helps a little IDK.

 

[vaper1960]

I’ve actually got a gigantic mechanical variable voltage inverter that works off wall power that I’ve been meaning to turn into a hookah for years. Maybe I’ll get around to it. Thing weighs like 40 pounds or something . It’s huge.

I think we have joked about that before... just want to say, it good to see you back

 

[rob33]

A 28ga SS clapton coil at.6Ω to .7Ω is my sweet spot with a 30A 20700 battery. On a mech at 3.9V compares to 18 to 20W regulated, but even at 3.2V is decent (12 to 14w my guess). Just as important to me the battery charge last all day.

 

[lupinehorror]

4.2V here.

 

[dripster]

It depends. Typically it will be the (combined) resting voltage of the cell(s) that I plan to use fully charged, minus the voltage sag of the cell (or cells, if the mech in question is parallel or paraseries so basically the voltage sag gets divided by the number of cells that are in parallel). Assuming a resting voltage of 4.2V with just a single cell, I go by these simple equations:
I = 4.2 / (R + DC IR)
V = 4.2 - (I × DC IR)
Also, P = V × I

So, for a series mech with two cells, the 4.2 (and the DC IR) in the above equations needs to be doubled because the resting voltage is combined, whereas for a paraseries mech such as the Hammer Of God (V3 and up) the 4.2 needs to be doubled (but the DC IR does not). Whereas in the triple-parallel Stormbreaker mod the 4.2 is still applicable, but the DC IR needs to be divided by three.

Occasionally, I also use a stacked tube with more than just two cells. (I.e., three cells, sometimes four.) However, the round cells I use for vaping also include the A123 Systems ANR26650M1-B, which is a LiFePO4 that's fully charged to 3.6V and that I use in a couple of series mechs sometimes also. And, just because I can use up to four cells in series, doesn't also mean I run them fully charged. The SkyRC MC3000 can charge them to pretty much whatever the voltage I might need. So I'm not too worried.

 

[Skunk!]

4.2 just to be safe.

 

[Robbert]

I use 3.6-3.7 when using coil steam calculator.
I try to choose a coil build with low leg loss,temperatures in the high green or low yellow with a voltage of 3.6-3.7.
I mainly make sure that I don’t draw more amps than batteries are rated.

 

[AvaOrchid]

I calculate using 4.2 that way I have a lil safety margin. Then again I've only been using mechs for the past few months.

 

[bombastinator]

I marked watts rather than volts because it’s the much more normal question. The issue with voltage is there isn’t a lot of room to maneuver as far as batteries are concerned. For safe liion operation It’s about 3-4v varies a few points on either side generally. unless series batteries are being used. With mechs the coil controls how much voltage is used. It’s real possible to over stress a battery and damage it do you’re going to generally see stuff in this range. Usually near the top of that range.

 

[Coyote628]

Tonight I got out my single battery geekvape tsunami. I do the math with 4.2 volts. On the setup I've got rigged on it, I'm using a dead rabbit with dual coils of my own twisted creation that have a resistance of .22ohms. That give me 19.09 or so amp draw. Since the 25r Samsungs are a 20 amp battery, I have a bit of wiggle room as long as I'm not chain vaping this thing. I've got some higher amp batteries ordered so I'll have more wiggle room when I get them. But since I'm not gonna use this mod as a daily driver, I figure I'm good for the time being.