shocking voltage drop

[geordie_vaper]

only got one mod i gave up for over a week, kept one mod and few kayfuns, but vape just as much as i did, its ok with taking the voltage drop into account i am still vaping at around 14 watts on a fresh battery it should be 19 watts. but 14 is still decent till i get a new mod of fix this

[robby]

That voltage drop really isn`t that bad, I believe the internal resistance of that battery you have is about .09 ohms (please correct me if I am wrong as it can make a big difference). It`s closest to the top Panny in the table above which is the worst performing of the three above, but they are not BAD batteries, many much worse than that. Once you take battery internal resistance into account, no battery will give you 4.2V when it is loaded with a coil, and the lower the resistance of the coil (more current), the more that internal battery resistance will drop across itself.

Dont know whether you have seen this thread, a bit of the theory of voltage drop allaboute-cigarettes.proboards.com/thread/40391/mech-voltage-drop-important-updated

My tests were done on an all copper Nemesis.

[geordie_vaper]

yeah saw it robby will need to read it word for word, my mind goes blank when it sees loads of txt

[robby]

Jun 29, 2014 10:07:36 GMT geordie_vaper said:

yeah saw it robby will need to read it word for word, my mind goes blank when it sees loads of txt

I didn`t include battery resistance until near the end, or it would have been too confusing to take in at once, battery resistance is a bit of an odd concept to take in and accept. You would naturally assume that a freshly charged 4.2 battery would give you 4.2 volts on the coil, but it never actually does

[geordie_vaper]

bookmarked to read word for word later

[VapingBad]

Jun 29, 2014 10:07:36 GMT geordie_vaper said:

yeah saw it robby will need to read it word for word, my mind goes blank when it sees loads of txt

For the video generation:

[robby]

Excellent vid VapingBad  Wish my head (and mouth) worked that fast

[VapingBad]

Jun 29, 2014 11:33:54 GMT robby said:

Excellent vid VapingBad  Wish my head (and mouth) worked that fast

Cheers Robby, his Do I Need a Mechanical Mod? is very good as well.

[geordie_vaper]

its my 18350 batterys.

have just put a 18490 in and i am getting a .6.

so is the reason why the drop was bigger with a 350 battery cause of its internal resistance?

[VapingBad]

Jun 29, 2014 11:54:57 GMT geordie_vaper said:

its my 18350 batterys.

have just put a 18490 in and i am getting a .6.

so is the reason why the drop was bigger with a 350 battery cause of its internal resistance?

Yes, and it's internal resistance is higher mainly because it's smaller.

[robby]

Easier to understand if we separate the battery resistance and place it in circuit visually.




VMeter 2 is the coil voltage, VMeter0 is the Battery voltage loss due to internal resistance and
VMeter1 is the combined voltage loss of the Mod, Switch, Connectors etc
Imeter0 is the current flowing through the circuit.






eter 2 is the coil voltage, VMeter0 is the Battery voltage loss due to internal resistance and
VMeter1 is the combined voltage loss of the Mod, Switch, Connectors etc
Imeter0 is the current flowing through the circuit.

So, the top setup would give you 15.9 watts (3.57V available to the coil) and the bottom setup would give you 18.8 watts (3.88 available to the coil) because of the difference in battery internal resistance. The bottom battery was a high output LG (20AMP).

In the case of the bottom setup, Power = Volts X Amps which gives us 3.88 X 4.84 = 18.8 watts.

[geordie_vaper]

whatever it was gave me a headache all those numbers haha, but i get the jist of it now, thanks robby thanks VapingBad