Ohm question

[james28]

well I built my first coil after a year of vaping. But I just want to check I am not going to inadvertently cause a failure here. I was told 5x2.0mm wraps of 26g would be .5 ohm it has come in at .3 on my kangertech Kbox mini. I have Samsung INR25 batteries. Is this within their tolerances on this mod. I have had the batteries for a year and they don't seem to have degraded at all, still get a solid day and I do most of my vaping when I get home. Should I be changing batteries soon or is this a safe setup now? I have looked for a battery guide but can't find it. If not will more wraps up the ohm? Sorry for the probably many silly questions thanks James

 

[xwarp]

I wrap 26g for 5 loops around a 2.5mm bit and it's pretty close to .5 but creeps to .6 the longer I use it.

I am using the Kbox Mini Platinum with the Samsung 25R's about 30 watts and have no problems.

When referring to the "delay", are you talking about that second or so of time from the time you fire it to the time it takes to get the vapor?

I've experienced it also, but just got used to it I guess because I don't notice if it's happening or not.

 

[IMFire3605]

4.2v/0.3ohm=14amps (Reaching the 75% threshold on the 25R being it is a 20amp battery, this is for a mech/unregulated)
Regulated (if you set the watts or volts) Watts/3.2v/0.9=Final Amps (Single Battery Mod), Watts/6.4v/0.9=Final Amps on a dual battery regulated. If you haven't abused your batteries (running them at full current draw) but been using them gently to where you haven't stressed them heavily, 12 to 18months is not unheard of, I've run VTC4's up to 14months the set before my current set I have, so is not uncommon, I'd still start testing them with a Digital Multimeter, 4.2v off the charger should be about 4.16 to 4.18 with a DMM, but if they are 4.0 or so then they are done.

 

[rice721]

With regulated devices, anything with a chip and screen, you really don't have to worry too much about the resistance of your build or prebuilt coils.

What you have to be cautious is the power level you're vaping at and the battery(s) you use in your device IE: Watts Law

Amperage = Watts / Volts

Amperage is the CDR required of your battery
Watts is the power lvl you vape at
Volts is usually the soft cutoff of the mod, normally at 3.2V

You also have to factor in inefficiency...the average consumer mod is about 90% efficient, or so I've read.

So say you want to vape at 60W in a single battery device.

Amperage = 60W / (3.2V x 0.90) = 20.8333

I would not go higher than 60W per 20Amp CDR battery.

 

[sonicbomb]

All good advice so far
@james28 check out steam-engine.org an online tool that allows you to model your prospective coils (and many other things) taking away the guesswork. You can also check the amp draw of your wattage selection allowing you to safely choose an appropriate battery. As stated remember that a regulated mod will be drawing the most amps from the battery when it is nearly ready to be changed at around 3.2 volts.
You may also want to check out out resident battery gurus blog or at least take a look at his chart of recommended batteries I have put below.

 

[evan le'garde]

Five wraps of 25g kanthal (0.45mm) with an inner diameter of 2.5mm will produce a 0.5 ohm coil all day long. Used to build them all the time on a Kanger Subtank RBA deck. Still got them sitting in the cupboard actually.


So i set the Inner diameter setting to 2mm. I chose "single coil". Input the target resistance to 0.3 ohm. Set the leg lenght to 2.5.
Then i just skipped through the "diameter of wire" setting until the "number of wraps" results hit five. And guess what ?. Steam engine says :

23awg Kanthal.

Maybe there's something wrong with steam engines calculations.

 

[james28]

Thanks for all the advice, turned out it was stainless steel wire So now I have 8 wraps for a .4 coil. Back to the shop tomorrow Is there anything different with SS except the lower resistance?

 

[rice721]

Thanks for all the advice, turned out it was stainless steel wire So now I have 8 wraps for a .4 coil. Back to the shop tomorrow Is there anything different with SS except the lower resistance?

some say it tastes cleaner than kanthal in power mode, I find it to be similar. you can also use SS in temperature control mode.

 

[Jdurand]

some say it tastes cleaner than kanthal in power mode, I find it to be similar. you can also use SS in temperature control mode.

SS can't be used in TC mode on all mods. Check the specs on your model first before attempting.