purge 21700 dual series side piece mech builds

[jmc1980]

I have a new purge 21700 dual series side piece mech mod that I purchased online after almost a week of searching for one. I use 2 Samsung 30t 35 amp batteries and a brass Kennedy 28mm rda with a .35ohm build. An educated friend of mine told me with a dual 21700 35 amp batteries that setup I can safely build as low as .24ohms. I have 5 series mods already with 30 amp batteries which I know can be .28ohms or higher but I never go below .35ohms. My question is can I safely build as low as .24ohms on my purge 21700 side piece series mech. I only want to know if .24ohms is safe I still won't go below .30ohms on that mod. thanks in advance for any help, Jeff

 

[jmc1980]

double post

 

[T0mmy1977]

Below is from an online calculator. It doesn't look safe to me.

 

[jmc1980]

thanks TOmmy, I definitely won't be building any .24ohm builds. What is the lowest/safest build recommended for a dual series 35 amp mech?

 

[T0mmy1977]

You want to stay within the safety zone of what the battery can handle. I'll let someone with more mech experience chime in.

 

[jmc1980]

O.K. Can anyone inform me about a minimum ohm build for a dual series 35 amp mod? I won't build the lowest ohm possible with that mod, I just want to know how low I can theoretically go. Thanks again, Jeff

 

[UncLeJunkLe]

Maybe @Mooch can chime in here and answer the question. I think he mentioned this in a video and I scanned a handful of videos yesterday when you first posted this but I couldn't find it.

 

[mimöschen]

You ask the wrong question again, as it has already been answered.
"What's the benefit in building below .3 ohms?" would be more suited.

 

[2naphish]

the theoretical 8.4 volts you are sending to a .24 ohm build would theoretically pull 35 amps.
i just don't see any point to pushing any device or battery to the limits.

 

[jmc1980]

2naphish, I agree with you. The key word is theoretically because I would never build that low. Ever. However, you obviously understand that. Thanks for the specific information I was looking for, Jeff

 

[2naphish]

2naphish, I agree with you. The key word is theoretically because I would never build that low. Ever. However, you obviously understand that. Thanks for the specific information I was looking for, Jeff

voltage divided by resistance = amp draw 8.4 ÷ .24 = 35
you should probably use the theoretical 8.4 for a slight safety buffer even though the battery sag and voltage drop in the device prevent the full voltage from reaching the coils.

 

[jmc1980]

2naphish, what is your opinion for a proper/safer voltage number to divide by resistance equaling a safer amp draw.

 

[UncLeJunkLe]

2naphish, what is your opinion for a proper/safer voltage number to divide by resistance equaling a safer amp draw.

You really should take a day or so and sit and watch some Mooch videos.

 

[jmc1980]

I guess I probably sound like more of a newb than I really am. I've been building rdas on mech mods for the last 7 years. I just always built series mods with either 18650 or 26650 batteries. no batteries above 30 amps. 35 amp battery series mods are still relatively new to me. I hope this info is a bit of relief for anyone alarmed by anything I posted here. Thanks, Jeff

 

[jmc1980]

you are correct UncleJunkie, watching someone like Mooch could never hurt anyone.

 

[mimöschen]

The voltage of the 30T at 35A sags to about 3.8V.
Ignoring voltage drop of the mod you may be able to build as low as 0,22ohm.
Let's say the voltage drop of the mod is another 0.2V, that would allow you to build a 0.21ohm coil without exceeding the 30T's CDR.

 

[T0mmy1977]

The voltage of the 30T at 35A sags to about 3.8V.
Ignoring voltage drop of the mod you may be able to build as low as 0,22ohm.
Let's say the voltage drop of the mod is another 0.2V, that would allow you to build a 0.21ohm coil without exceeding the 30T's CDR.

But why? That's some crazy wattage.

 

[jmc1980]

But why? That's some crazy wattage.

I always vaped at .30ohms - .35ohms on a dual 30amp battery series mod. I thought I could go at or below .28ohms with a dual 35amp battery series mod. I've considered .28ohms with the extra power of 35amp 30t batteries. As of right now I have a .35ohm build with the 35amp battery setup. Jeff

 

[mimöschen]

Even all the safety issues aside that come up when you run a pair of cells near its max CDR, me personally, I think that's unnecessary and plain stupid, because you will need insanely large coils to compensate for the searing heat at those resistances/wattages.

But then again you could as well build higher resistance coils in the first place. Ramp up and most of all cool down of the coils will be better all across the board, which results in much better coil life/less rewicking efforts.
Battery life and overall cycle life of your cells will increase significantly as well, and all that without sacrificing vapor production.

 

[jmc1980]

Even all the safety issues aside that come up when you run a pair of cells near its max CDR, me personally, I think that's unnecessary and plain stupid, because you will need insanely large coils to compensate for the searing heat at those resistances/wattages.

But then again you could as well build higher resistance coils in the first place. Ramp up and most of all cool down of the coils will be better all across the board, which results in much better coil life/less rewicking efforts.
Battery life and overall cycle life of your cells will increase significantly as well, and all that without sacrificing vapor production.

I agree. I was just curious how low I could hypothetically build on a 35amp dual series mod. Of course I won't actually build that low, that would be dangerous and foolish to do. At the moment I have a .35ohm build in it. That build is perfectly safe to me.