Mech Mod Newbie Here; First Build Questions

[SINphul]

So after almost a year of being a regulated mod purist, I've decided to dip my toe into the mech mod waters. Partly because I'd like to try out some RDAs (I've only used RTAs to this point), and partly because I recently picked up a Fogger v4, and my regulated mods have a hell of time heating up all that metal in the dual coils fast enough for a satisfying vape. That said, I've recently ordered myself an Hcigar SS Nemesis and some Efest 35A batteries to power it.

Typically, on my single coil RTAs, I tend to like vaping at around 11.5 watts. Now with dual coils, as I understand it, the wattage applied is actually split between the two coils, correct? In that case, should I ideally want to be applying around 23 watts to my Fogger to get the satisfying vape I'm looking for? The reason I ask is because according to Ohms law, that puts me into sub-ohm territory with my build (around a 0.8 ohms total resistance, or 1.6 ohms for each coil, assuming a fully charged 4.2v battery is used). I thought I should ask the pros here first if my thinking is on the right track before I go and do it.

Any incite is greatly appreciated!

 

[Cheflance]

I just posted something similar. Getting my first mech mod today, I hope, waiting for the mail. I got a Stingray clone. Similar situation and I will check your thread and if I get any advice I will repost here. Good luck and best wishes on the new setup. How do you know the amps on your battery? I have the Efest IMR18650's, 2000 mah, 3.7V reds.

Really want to make sure I do my builds right and stay in safe zones.

 

[SINphul]

I just posted something similar. Getting my first mech mod today, I hope, waiting for the mail. I got a Stingray clone. Similar situation and I will check your thread and if I get any advice I will repost here. Good luck and best wishes on the new setup. How do you know the amps on your battery? I have the Efest IMR18650's, 2000 mah, 3.7V reds.

Really want to make sure I do my builds right and stay in safe zones.

Nice! The Stingray looks pretty sick. The Efests I'm using are the new, purple 35 amp limit version (18650 2500mah). I have a bunch of the Efests that you use as well (the red ones), and I believe those ones have a 10 amp limit. I've only used them in my regulated mods though. Phil Busardo keeps a running list of batteries and their amp limits here that I use frequently: Taste Your Juice | BATTERY INFORMATION

As long as your builds aren't pushing beyond 8ish amps (save 2 amps for a safety buffer), I'd imagine you'd be just fine. But again, I'm no pro. I'm just basing everything on what I've read up on thus far. So by that logic, I'd say don't take your builds under 0.6 ohms just to be on the safe side, if you plan to use those batteries.

As for my questions, I'm *pretty* sure I'm well within the safety limit with the purple Efests, but I just want to make sure my logic is correct with the wattage I should attempt to be achieving with my dual coil builds. Whether doubling the wattage I enjoy vaping on a single coil is a good start, or if that's just going to fry my juice

 

[jpcwon]

Congrats on your new mech mods guys!! I vaped a Provari and an iTaste VTR for a while before getting a mech mod, and I can honestly say that having a mech is definitely a game changer. It forces you to be vigilant about battery output and atty resistance. If you haven't already, I would recommend downloading an Ohm's Law app onto your phone....It's nice because you can plug in your atty resistance and battery voltage, and it will tell you how many amps you're drawing from the battery. Like for instance, if you're running a .6 Ohm Dual Coil setup and you're battery voltage is at 4 volts, then you'd be pulling 6.67 Amps from the battery.....a .4 Ohm setup at 4 volts would be 10 Amps....

So as long as you're aware of your battery's capabilities and what's going on with your atty, then you'll be fine.....I use the Purple Efests for 18350 (10.5 amp limit) and AW IMR 18490's (16 Amp limit). Then, for 18650, I use Sony VTC5's (30 Amp limit)......those seem to be the best batteries for mech mod use IMO.....

Anyway have fun, and I guarantee that once you go mech you'll never go back! And be careful...buying mechs can be addicting!! haha...

 

[Cheflance]

@jpcwon - Recommendations on a good Ohm's Law app?
Dual Coil set-up - so that is going to double the Amps, also? I know that the law for resistance in parallel is 1/ohms + 1/ohms for 2 coils. But that is also doubling the Amps because it is going through 2 coils? Want to make sure I got this right because my Aqua clone is a dual coil build.

 

[Brady2021]

I just posted something similar. Getting my first mech mod today, I hope, waiting for the mail. I got a Stingray clone. Similar situation and I will check your thread and if I get any advice I will repost here. Good luck and best wishes on the new setup. How do you know the amps on your battery? I have the Efest IMR18650's, 2000 mah, 3.7V reds.

Really want to make sure I do my builds right and stay in safe zones.

So I have the Hcigar Stingray Clone, as well as Efest 18650 30 amps. You want to find your batteries constant output max, which is way lower than 30 amps. Probably around 20. Use your Ohms law calc and keep your resistance between .55 and 1.0

I have a dual super nano dragon coil setup with 29g kanthal ohmed out at .55 and it is perfect. It is the low side of the spectrum, but honestly, with your battery and mod setup, this is your ideal range. If you are going to use a 30 amp battery, get out of it what it is meant to give. If you can keep your total resistance between .55 and 1.0, with proper ventilation and wicking, you're guranteed a safe and dense vape.

 

[Brady2021]

@jpcwon - Recommendations on a good Ohm's Law app?
Dual Coil set-up - so that is going to double the Amps, also? I know that the law for resistance in parallel is 1/ohms + 1/ohms for 2 coils. But that is also doubling the Amps because it is going through 2 coils? Want to make sure I got this right because my Aqua clone is a dual coil build.

Quit your thinking and plug in your resistance with ohms calc. Resistance and voltage will be all you need to know/ Measure your resistance on your atty and no matter how many coils you have on it, your multimeter will read it the same.

 

[jpcwon]

@jpcwon - Recommendations on a good Ohm's Law app?
Dual Coil set-up - so that is going to double the Amps, also? I know that the law for resistance in parallel is 1/ohms + 1/ohms for 2 coils. But that is also doubling the Amps because it is going through 2 coils? Want to make sure I got this right because my Aqua clone is a dual coil build.

Any of them will work just fine I think....

Brady is right; don't worry so much about whether your setup is single/dual coil....all that matters is what the final resistance value is for your setup.....but you are in theory correct. A .4 Ohm setup at 4 volts will be drawing 10 amps.....if you were to half that resistance down to .2 Ohms, then you'd be drawing 20 Amps.....

 

[Nightshard]

Doesn't matter if yr using two or ten coils, what matters is your total resistance and your max volts (4.2), use ohm's law formula to calculate amps and see that it's below your battery amp rating with a big enough margin of error.

 

[minimalsaint]

You don't really need a dual coil to get what you're getting now. A 1.3 ohm single coil and a fresh (4.2v) battery will give you around 13.5 watts. If you vape the battery down to 3.9V you will still pull over 11 watts.
Amp limits are also well within your battery limits (3.5 amps max) with the higher resistance and your battery life increases considerably. I bought a couple of the purple 35A efest batts and I usually stay around 1.2 ohms. I have yet to drain one of them past 3.9V using it all day.
Here's a handy calculator:
Watts - volts - amps - ohms conversion calculator

Enter any 2 known values to calculate.
Have fun with your new mech, be safe and enjoy!