Ok so I've been playing with sub ohm, dual, micro coils. Yesterday I did a dual coil that metered at .6 ohms and I'm starting to question how safe this is. I love that it gets hot but is it safe?
ohm safety
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As long as you had a battery that could handle at least a 10 amp discharge you would be ok. Though I wouldn't go much lower than a .6 ohm coil. I got some of those Sony 30 amp 18650's from fasttech. I have no clue whether they will truly handle a 30 amp discharge but they are working great for now. Though I did have to smother my firing pin in Noalox to get it to stop arcing on those batts.
So, generally speaking, you can plug your resistance and voltage into this calculator. (use 4.1 volts for mechanical devices, or 4.2 if you're paranoid) This will tell you the amperage (the rate at which you are discharging your battery)
Ohm's and Joule's Law Calculator
You need to find the specifications for your battery. The "maximum continuous discharge" rating for, say AW 2000mAh 18650. (or what you may have) The max. discharge rating is the Amperage at which it is safe to discharge your battery.
Sometimes Max Discharge is listed as a "C"-rating. Here, you would take the C value and multiply the mAh of the battery by that number.
For example: if my 2000mAh battery is rated at 8C: 2x8=16 Amps (max. discharge)
. . . . . . . . . or, if my 1600mAh batt is rated at 15C: 1.6x15=24 Amps (max. discharge)
(Hint: milliamp hour, mAh, = thousandths of an amp hour. so 2000 thousandths is 2. An 1100 mAh battery would be multiplied as 1.1 And a 700mAh batt. would be 0.7)
Ohm's and Joule's Law Calculator
You need to find the specifications for your battery. The "maximum continuous discharge" rating for, say AW 2000mAh 18650. (or what you may have) The max. discharge rating is the Amperage at which it is safe to discharge your battery.
Sometimes Max Discharge is listed as a "C"-rating. Here, you would take the C value and multiply the mAh of the battery by that number.
For example: if my 2000mAh battery is rated at 8C: 2x8=16 Amps (max. discharge)
. . . . . . . . . or, if my 1600mAh batt is rated at 15C: 1.6x15=24 Amps (max. discharge)
(Hint: milliamp hour, mAh, = thousandths of an amp hour. so 2000 thousandths is 2. An 1100 mAh battery would be multiplied as 1.1 And a 700mAh batt. would be 0.7)
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What batts. you got in that box?
The PD2900's from Orbtronic are well built and rock up to 18a. And stay oh so cool all the while. Did I mention well built, like nice, thick wrapping (which is most of your HS protection).
The PD2900's from Orbtronic are well built and rock up to 18a. And stay oh so cool all the while. Did I mention well built, like nice, thick wrapping (which is most of your HS protection).
So, now we get into the difference between Maximum Continuous Discharge rating, and Max. Burst (or Pulse) Discharge rating. Most pulse/burst ratings are figured at anywhere from 5 to 30 seconds of battery use. The Pulse/Burst rating is much higher than the Continuous rating. Some people use that to determine safety parameters. I don't. Mods do get fired in pockets, purses, boxes, dogs (not), glove compartments, etc. I prefer staying within the safety zone that includes surprises.
The Orbitronic PD2900s are rated at 10amp max. continuous and 18amp burst.
The Orbitronic PD2900s are rated at 10amp max. continuous and 18amp burst.
They got Bishops seal of approval, I researched, they seem to hold better than MNKE's.
Oh yeah, LOCK YOUR DEVICES PEOPLE.
Oh yeah, LOCK YOUR DEVICES PEOPLE.
0.6Ω is fine. But that's your bottom limit. 
. . . . . . well, fine, 0.5Ω . . . . . .
0.4Ω puts you at 10.5 amps on a 10 amp battery
p.s. the max cont. discharge rating for your AW 2000 mAh 18650 is 10 amps
. . . . . . well, fine, 0.5Ω . . . . . .
0.4Ω puts you at 10.5 amps on a 10 amp battery
p.s. the max cont. discharge rating for your AW 2000 mAh 18650 is 10 amps
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M&S, if you don't mind I'm gonna piggyback on your thread hear so as not to start a new one.
So, if i plug in 8.3 in the "voltage" value (for stacked 18350s) and 1.8 in the "resistance" value (for the coil)....it says I'm vaping at 38 WATTS!!!
That can't be right.....is it? How can you tell what watts you are vaping at with a VV Grand?
So, if i plug in 8.3 in the "voltage" value (for stacked 18350s) and 1.8 in the "resistance" value (for the coil)....it says I'm vaping at 38 WATTS!!!
That can't be right.....is it? How can you tell what watts you are vaping at with a VV Grand?
VV Grand is a regulated device. You needn't concern yourself with these things, Treebeard. Your VV does the figurin' for ya' 
Thank you so much!!! I couldn't understand it and I was freaking out that I might short out my stuff because I'm trying to play scientist!! lol0.6Ω is fine. But that's your bottom limit.
. . . . . . well, fine, 0.5Ω . . . . . .
0.4Ω puts you at 10.5 amps on a 10 amp battery
p.s. the max cont. discharge rating for your AW 2000 mAh 18650 is 10 amps
This isn't just my thread!! Anyone can post in any thread I start, we all have questions and someone else most likely has the answer so please ask away, I could end up having the same question either now or at another time.
VV Grand is a regulated device. You needn't concern yourself with these things, Treebeard. Your VV does the figurin' for ya'
Ok. "In pdib I trust".
I just got this VV today so I'm trying to figure it out. I'm getting a great vape but it is so different from my mech grand and mimi 2.1.
I have a 1.8 ohm coil and have I have the volt wheel cranked up all the way. I thought this would scorch the nose off my face but it isn't. Although it's producing about the same amt. of vapor as the mech reos, it is a much cooler vape...mild even. I would describe the TH as tame compared to the others. I'm using the same setup as I have on the mechs...RM2, micro 1.8 ohm and rolled cotton.
I know this has probably been answered many times but how low in ohms can the VV take?
Ok. "In pdib I trust".
I just got this VV today so I'm trying to figure it out. I'm getting a great vape but it is so different from my mech grand and mimi 2.1.
I have a 1.8 ohm coil and have I have the volt wheel cranked up all the way. I thought this would scorch the nose off my face but it isn't. Although it's producing about the same amt. of vapor as the mech reos, it is a much cooler vape...mild even. I would describe the TH as tame compared to the others. I'm using the same setup as I have on the mechs...RM2, micro 1.8 ohm and rolled cotton.
I know this has probably been answered many times but how low in ohms can the VV take?
hmmmmmmm . . . . Treebeard. I've never even set eyes on a VV Grand. this is a question for someone else. BUUUUT, that don't sound right. You oughta be able to turn a 1.8Ω coil up to a truly unpleasant voltage level. Assuming the VV Grand is new, you should look at your batteries for troubleshooting as well as your 510 connection. (If it were me, I'd PM Rob)
Ok. "In pdib I trust".
I just got this VV today so I'm trying to figure it out. I'm getting a great vape but it is so different from my mech grand and mimi 2.1.
I have a 1.8 ohm coil and have I have the volt wheel cranked up all the way. I thought this would scorch the nose off my face but it isn't. Although it's producing about the same amt. of vapor as the mech reos, it is a much cooler vape...mild even. I would describe the TH as tame compared to the others. I'm using the same setup as I have on the mechs...RM2, micro 1.8 ohm and rolled cotton.
I know this has probably been answered many times but how low in ohms can the VV take?
Hey TreeBeard, I've got three Grands and I can honestly say that if you turned that thing all the way up it should be burning up something. I've got a special RM2 coming from Rob to fit my VV Woodville, in the mean time, I tried playing around with it and put on a 1.8 atty. I wasn't careful and had turned up the wheel because I was not getting any fire from the unit (RM2), so when I stuck the 1.8 atty
in the unit, it fried it! It wasn't the VVs fault, but it was my fault, I had it turned all the way up! So you may want to look connections and etc.. Now, on my other two VVs,(with RM2s) I've got some 1.8-2.0, turning them up produces a roaring vape, that to me is down right unbearable and I'm sure would be for any other human being!
Thanks for the help guys. Upon further deliberation, it may be a problem with the new RM2. It doesn't fire well on my other two (mech) REOs either. Granted, it is a 1.8 coil but it should produce at least a halfway decent hit on the mechs with 4.0 left on the batteries....yes?
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