Don't forget about Watts Law

[sonicbomb]

Just want to see if I understand.

On a variable wattage mod, to calculate the amp load from the battery(at a basic level):
Watts / battery voltage / number of batteries (not accounting for board inefficiency)

So if you have a 50 watt mod that uses a single 18650
at full charge it's 50/4.2/1 = 11.9 amp
at low voltage(more important) it's 50/3.2/1 = 15.6 amp

Is that right?

Yes

 

[Canadian_Vaper]

I've never once had to refer to ohms law

it's taught in highschool physics... Guess you didn't pay attention ^__^

 

[Dlmdavid]

it's taught in highschool physics... Guess you didn't pay attention ^__^

I meant I've never had to refer to ohms law in regards to vaping, as an electrician I am more than familiar with it and use it on a regular basis, just not when it comes to vaping

 

[sonicbomb]

I meant I've never had to refer to ohms law in regards to vaping, as an electrician I am more than familiar with it and use it on a regular basis, just not when it comes to vaping

Do you vape cartos or cigalikes?

 

[beckdg]

its not the quadratic equation or quantum physics its a 5th grade division problem......

Exactly why asking on a forum what battery (ies) will work for your setup is acceptable.

If it was something even remotely difficult to answer... like say what percentage of an IMR's CDR is acceptable to pulse a battery at for say 5 or 10 seconds to get a vape... forget it. Even popular opinion here will be nothing more than a guessing game.

A very convincing guessing game, nonetheless.

Tapatyped

 

[crxess]

it's taught in highschool physics... Guess you didn't pay attention ^__^

Pssssst.............Some of us are old enough that it was not a required class.

 

[beckdg]

Totally agree. I am almost entirely unable to do math, beyond simple arithmetic, so I depend on the Steam Engine calculator to figure all this stuff for me. But one thing I do know very well: the higher resistance the coil is, the longer the battery will last. So yeah, it's very important to know the coil's resistance -- without that piece of info, you can't even use the Steam Engine calculator to know what the amp draw will be. The higher the resistance, the lower the amp draw = longer battery life.

Andria

That's all board inefficiencies and will be merely marginal across the acceptable resistance of the mod if it's regulated. 50 watts is 50 watts.

50 watts is 50 watts when the battery is at 4.2V.

50 watts is 50 watts when the battery is at 3.2V.

Tapatyped

 

[ReigntheGamer]

Pssssst.............Some of us are old enough that it was not a required class.

But we can write in cursive.

 

[WharfRat1976]

So to summarize the thread:
3+2=5
2+3=5
Is this correct? Oh, what mech should I buy[emoji44]

 

[AndriaD]

That's all board inefficiencies and will be merely marginal across the acceptable resistance of the mod if it's regulated. 50 watts is 50 watts.

50 watts is 50 watts when the battery is at 4.2V.

50 watts is 50 watts when the battery is at 3.2V.

Tapatyped

Uh.. yeah, it is. And the fewer amps you draw from the battery, the longer it lasts. As for 3.2v... WHA...? I never ever let my batteries get below 3.7v before I charge them.

Andria

 

[Lessifer]

So to summarize the thread:
3+2=5
2+3=5
Is this correct? Oh, what mech should I buy[emoji44]

Well, I will admit that I did not know that there was a different equation to find the amp draw on a battery when using a VW mod, as opposed to when using a mech. It's an important distinction, if I were ever to choose to use a VW mod. Although it seems like you should be pretty good using a 20amp or more battery, as long as the mod's chip itself doesn't try to go higher than the number of batteries can support.

 

[ReigntheGamer]

So to summarize the thread:
3+2=5
2+3=5
Is this correct? Oh, what mech should I buy[emoji44]

I got both those questions wrong and I am vaping a mech. I r die?

 

[WharfRat1976]

Well, I will admit that I did not know that there was a different equation to find the amp draw on a battery when using a VW mod, as opposed to when using a mech. It's an important distinction, if I were ever to choose to use a VW mod. Although it seems like you should be pretty good using a 20amp or more battery, as long as the mod's chip itself doesn't try to go higher than the number of batteries can support.

Not that important with a vv/vw. The mod will let you know if you are dead shorted or if the resistance is too low for the mod considering both battery and chip.

 

[petrotech]

And that's why I use mech mods...

That math is a lot easier for my little brain.

 

[Dlmdavid]

Do you vape cartos or cigalikes?

No I use a Sigelei 100w, which is a regulated mod, which is why I have never, nor will ever, need to factor ohms law into my vaping, I could do it but it is completely irrelevant to what I need to know

 

[Lessifer]

Not that important with a vv/vw. The mod will let you know if you are dead shorted or if the resistance is too low for the mod considering both battery and chip.

Will the mod tell you that the 10 amp battery you put in isn't safe to run at 50w? Actually asking, like I said, I don't use regulated mods.

 

[Dlmdavid]

Will the mod tell you that the 10 amp battery you put in isn't safe to run at 50w? Actually asking, like I said, I don't use regulated mods.

No, that is entirely user discretion, but it's easy to figure out the max amps your batteries can possibly discharge in your mod and buy accordingly, that's why I prefer regulated mods, I know the max amount of current I'll ever use so no matter what I know my batteries will be safe

 

[WharfRat1976]

Will the mod tell you that the 10 amp battery you put in isn't safe to run at 50w? Actually asking, like I said, I don't use regulated mods.

In "short", yes.

 

[beckdg]

Uh.. yeah, it is. And the fewer amps you draw from the battery, the longer it lasts. As for 3.2v... WHA...? I never ever let my batteries get below 3.7v before I charge them.

Andria

3.2V is a very common cutoff voltage at which many lithium cell dependent technologies will cease pulling from the battery in favor of just turning off or refusing to work.

Vape is no exception.

50W from a battery @ 4.2V = 11.90476A

50W from a battery @ 3.7V = 13.51351A

50W from a battery @ 3.2V = 15.625A

Coil resistance isn't going to change that in ANY regulated mod.

Maybe. Just MAYBE...

You could have a 10% efficiency difference between one build or the other due to how efficient the chip is under those conditions. But that big of a sway is EXTREMELY rare in modern electronics.

Tapatyped

 

[beckdg]

In "short", yes.

Icwhutudidthere

Tapatyped