I need help...again.

[Zutankhamun]

So many moons ago I learnt what works for me and rarely deviate.
Single cell mechs, making juice, rewrapping batts, storing nicotine, looking after batteries and building simple macro & micro coils isn’t an issue.

I need to know many other things so that I’m a fully registered master

1)Are stacked batteries just multis that run in series? Does that mean the voltage is increased but mAh stays the same which is opposite to parallel?
Why are there any safety concerns (or are there any anymore) when some double cell mechs are made which hold series?

2)Do you divide the resistance upon the amount of coils? I believe a single .8 would be a dual .4 if all other variables remain constant. So 4 x.8 would be a .2res?

3)How do you roughly work out the gauge and wraps needed for a specific ohm?
A 28g 6 wrap @ 2.5 is round about 1.2 so how would I roughly work out how many wraps would be needed for a .2 using 22g @ 3mm

4)What is the difference between macros and micros because I’ve never felt any

5) When using TC how do you work out the safety of how low you can build?
If you don’t rely on a plastic box to let you know...

6) what are the differences in using titanium, ss and nickel coils?

I’ll think of the other things I’m meant to ask later.
If anyone can answer some or any of the questions it would be appreciated.

I would like the answers to be void of opinion only. That’s why google hasn’t helped on this occasion. Too many people letting other people know there particular take on things. I don’t need any of that

Cheers

 

[Rossum]

1) Yes, stacked batteries run in series. This doubles the voltage and leaves the mAh the same. Parallels double the mAh while leaving the voltage the same. Either way gets you double the mWh.

2) Yes, if you wire coils up in parallel, divide the resistance of one coil by the number of coils you're going to parallel.

3) I use this: Coil wrapping | Steam Engine | free vaping calculators

4) The (inner) diameter of the coils.

5) The spec sheet for the board in the mod should tell you how low you can build.

6) Nickel has the lowest resistivity and the highest TCR. It's also very soft. SS has the highest resistivity and the lowest TCR of the common TC-capable materials. It can also be quite stiff. Titanium is sorta in the middle.

 

[Zutankhamun]

Thanks @Rossum

2)when you say built in parallel I’m confused.
So a quad coil split between the posts would only be a .4 if made of 4 x .8s
Or it would be a .2?
As I said, after learning what I needed I never considered anything other than the amount of coils you had.

3)Great stuff. I was asking bout the ‘knowing the build’ because I was chatting with somebody and he seemed to work it out in his head.
Myself, I used steam as well. Once I found what I wanted I never go back.
Was he just looking into the distance while he conjured those numbers to make it seem as if he worked it out or does he just memorise what is on steam?
There must be a method?

 

[Baditude]

For building your own coils, you'll find useful information in this blog: Information Resources for Your First RBA

(ie. what are the differences in using titanium, ss and nickel coils?)​

Series vs Parallel circuits: UNREGULATED PARALLEL BOX MOD VS. UNREGULATED SERIES BOX MOD | VAPING BATTERY SAFETY

​

I know you didn't want personal opinion, but purely from a user perspective I know from personal experience that I like an end total result of 0.5 ohm (your own preference will likely vary from mine). I use that total resistance in the coil calculator that Rossum suggested.

I also know from experience to make the inner diameter of my coils to be between 2.5 - 3.0 mm, simply because that size is easier for me to insert the wick when the coil is finished. That inner diameter is also used in the calculator.

(ie microcoil vs macrocoils)​

The calculator will ask for wire type used in a drop down menu. Basically fill in all of the variables that you can, and the other values (such as leg length) will fall to a default value for what has already been given to the calculator. The point in using a calculator is it will tell you how many wraps to make. Always check your results with some sort of meter.

​

In my blog Explain it to the Dumb Noob: Ohm's Law Calculations for a Mechanical Mod, I discuss how to determine the amp limit of your battery, how to determine the amp draw of a coil, and how to use a coil calculator. This is primarily for a mech mod.

As you may know already, coil resistance is irrelevant for a regulated mod; the choice in battery used is based upon the amp limit of the battery and the wattage setting you use. The spec sheet for the board in the regulated mod should tell you how low you can build.

 

[Zutankhamun]

Cheers baditude.
I’m not gonna change. Lol
I’ll have a good read to understand more though

I need a little part time job so I better know what I’m talking bout!
I don’t have any formal education. I’ve decided that while I study for some decent employment, it makes sense to do something I understand a little and enjoy.

Stacking shelves doesn’t sound all that

Unless it’s a shelf full of attys and mods!

 

[Rossum]

2)when you say built in parallel I’m confused.
So a quad coil split between the posts would only be a .4 if made of 4 x .8s
Or it would be a .2?
As I said, after learning what I needed I never considered anything other than the amount of coils you had.

In principle, one could wire coils in series, or with four coils, parallel two series strings of two. But in practice, I've never seen an atty that makes this at all straightforward, so I would assume all your coils will be in parallel.

3)Great stuff. I was asking bout the ‘knowing the build’ because I was chatting with somebody and he seemed to work it out in his head.
Myself, I used steam as well. Once I found what I wanted I never go back.
Was he just looking into the distance while he conjured those numbers to make it seem as if he worked it out or does he just memorise what is on steam?
There must be a method?

After a while, you get a feel for it. For example, I know that if I build a coil out of 25 gauge, and it's got the same diameter and number of wraps, it will have half the resistance that a 28 gauge coil made from the same material would. But then at one point, several decades ago, I spent a few years designing electrical transformers..

 

[Eskie]

One clarification on the parallel vs series mech battery thing. Parallel is the same voltage but double the amperage. Series is double the voltage but the amperage remains the same. You still need to consider the current supplied when working out your builds. A series mech will not be nearly as happy with a 0.2 ohm build as a parallel would be.

Edit: oops didn't click on @Baditude link to zamplebox. Image is the same but Baditude's is way more extensive in the explanation.

 

[Baditude]

Eskies graphic demonstrates the difference in the minimum "safest" coil resistance that you can use in three types of mechanical mods. The difference is significant -- 0.2 ohm in a parallel dual battery circuit; 0.3 ohm in a single battery circuit, vs 0.6 ohm in a series dual battery circuit.

A common myth or misconception to the misinformed is that you can build lower for a series dual battery mech because the voltage doubles. Nothing could be further from the truth as the above graphic demonstrates.

In a regulated mod, the onboard computer will determine if the resistance is too low for its regulator. It will refuse to fire and show an "atomizer too low" or "ohms too low" error.

 

[Zutankhamun]

A common myth or misconception to the misinformed is that you can build lower for a series dual battery mech because the voltage doubles. Nothing could be further from the truth as the above graphic demonstrates.

That’s really interesting. I’ve never thought about it at all.
Cheers @Rossum, @Baditude and @Eskie
I’m even having trouble with this forum after all these years
Can’t I speak to all three of you with only one @?

 

[gpjoe]

Don't know if it has been mentioned yet, with regard to series batteries:

ALWAYS use "married" pairs of batteries - same age and brand. Never pair on older, used battery with a new battery.

And critically important:

The max continuous discharge rate of batteries in series is equal to that of the rating for a single battery. When batteries are used in parallel you can double the safe discharge rating of a single cell since the workload is divided equally between the two cells.

 

[Baditude]

When batteries are used in parallel you can double the safe discharge rating of a single cell since the workload is divided equally between the two cells.

That's only partially true. In a perfect world the amperage would double, but in the real world a more conservative 1.5 X increase is more accurate to account for voltage drop and other factors. Watch Mooch's video for a more complete explanation.

 

[gpjoe]

I respect mooch and know that he is regarded as the battery "god", however he is just being cautious - and rightly so. Even with a single battery you should always leave some headroom, which is the main take-away from his lesson on parallel batteries in his video above. You wouldn't drive a 20a battery at 20a, nor should you drive two 20a batteries in parallel at 40a. In his example he's recommending 75% or 30a for safety reasons.

 

[williamclarkonet]

So many moons ago I learnt what works for me and rarely deviate.
Single cell mechs, making juice, rewrapping batts, storing nicotine, looking after batteries and building simple macro & micro coils isn’t an issue.

I need to know many other things so that I’m a fully registered master

1)Are stacked batteries just multis that run in series? Does that mean the voltage is increased but mAh stays the same which is opposite to parallel?
Why are there any safety concerns (or are there any anymore) when some double cell mechs are made which hold series?

2)Do you divide the resistance upon the amount of coils? I believe a single .8 would be a dual .4 if all other variables remain constant. So 4 x.8 would be a .2res?

3)How do you roughly work out the gauge and wraps needed for a specific ohm?
A 28g 6 wrap @ 2.5 is round about 1.2 so how would I roughly work out how many wraps would be needed for a .2 using 22g @ 3mm

4)What is the difference between macros and micros because I’ve never felt any

5) When using TC how do you work out the safety of how low you can build?
If you don’t rely on a plastic box to let you know...

6) what are the differences in using titanium, ss and nickel coils?

I’ll think of the other things I’m meant to ask later.
If anyone can answer some or any of the questions it would be appreciated.

I would like the answers to be void of opinion only. That’s why google hasn’t helped on this occasion. Too many people letting other people know there particular take on things. I don’t need any of that

Cheers

I have no input but im glad to see you still posting my friend!

 

[Zutankhamun]

I have no input but im glad to see you still posting my friend!

Hi man. How kind.
Have a thumbs up