if you compensate for resistance with voltage, what difference does it make?

[Dampmaskin]

I have real world tested it over a year. On one 18650 2000 mah in a zmax v3, at 10 watts with a 1.5 ohm I get 4 hours at my vape rate. With a 3 ohm at 10w I get about 8 hours at the same vape rate. Nearly equal vape volume. How do you explain that.

The first thought that strikes me is that the step-up converter of the zmax must be much more efficient than the step-down converter. It is strange that the difference is so big, though.

 

[Smittymc]

One other thing to keep in mind when it comes to making your own coils is the difference between series and parallel in that series increases resistance and parallel decreases resistance. So if you have two 2 ohm coil coils in parallel ideally you will have 1 ohm total resistance. When it comes to vaping math is your friend.

 

[JeremyR]

Yeah chip efficiency. The amp load at 1.5ohm is at the maximum straining the circuitry to deliver the amps. 1.5@10w is 2.5 amps = 2.5 amp draw at the mods amp limit wit a single battery. 3.0 ohms @ 10w is only a 1.8 amp drain and easier for the circuitry to achieve.

I know there are some on here that try to claim differently and I know where you got that edyle, this is not a knock to you, I put this question to those individuals, but the fact is the output is either 2.5 amp drain or 1.8 amp drain both at 10w of heat/power which lasts longer. Which strains the chip more in efficiency? These are the two factors that play in double the run time.

Sorry, to the op it has more to do with gauge of wire. Heavier gauge can give a richer flavor with slightly more vapor at the same wattage. Due to surface area. At the *same exact* *wattage* thinner gauge will always heat faster.

Just hope this helps some people have a better experience with thier vape.

And let's compare apple to apples not a mech to a standard chipped vv, two different animals.

My 0.4ohm coil lasts all day, probaly about 12hrs on a 2600mah 18650

That's great it's working for you and that's the other End of the spectrum where it works. So strong you for have to chain vape it. So if you take 200 puffs a day on it and I take 600 puffs a day on it the battery will last me 1/3 it lasts you. Or 4 hours.

If your interested in what I'm talking about great if not no big deal just as long as your vape does what you want.. Me I don't like changing bats all te time so I coil to give me the power and the life on the zmax chip.
vape on peeps!

 

[KenD]

One main difference is the high ohm at higher voltage to reach your desired watts is a lower amp drain causing your battery to last much longer like twice as long for the same wattage!

Watts are watts, but similarly amps are amps. All things being equal, a battery with a 1.5 ohm coil at 10 watts should last about 5.5 hours to the 3 ohm coil's 8 hours. If the device is equally efficient in bucking the voltage as boosting it the difference shouldn't be too drastic. Also, if the device is more efficient at bucking there mightn't be much difference in battery life at all. As for your hands on test, perhaps your zmax simply is far more efficient in boosting the voltage. You also need to account for you possibly having vaped a bit more with the lower ohm coil and therefore getting such a drastic difference in battery life (it's terribly difficult to vape 100% consistently throughout such subjective tests).

Most chips would need stacked batteries to hit 4-5amps to really pump the voltage to the heavy Gauge coil to get it to heat faster.

Increasing the voltage to get a higher amp draw (the latter of which is an indicator of the drain on the battery, won't in itself affect the vape quality/heat) also increases the wattage.

Generally (disregarding coil heat up times, which I really know nothing about), with a vv/vw device it won't matter that much what the resistance of the coil is as long as it will let you hit the wattage you're going for. However, most devices will start to get more imprecise as you boost the voltage beyond a certain level. Some might do that with bucking down too much as well, I don't know.




Sent from my GT-I9100 using Tapatalk

 

[edyle]

One main difference is the high ohm at higher voltage to reach your desired watts is a lower amp drain causing your battery to last much longer like twice as long for the same wattage!

Not trying to start anything, but... I would respectively, highly disagree edyle. Have you tried it? I have real world tested it over a year. On one 18650 2000 mah in a zmax v3, at 10 watts with a 1.5 ohm I get 4 hours at my vape rate. With a 3 ohm at 10w I get about 8 hours at the same vape rate. Nearly equal vape volume. How do you explain that. Try it your self you will see.. Just sayin that's my experience.

.....

You may get better efficiency at higher resistance, however, it is not due to lower amp drain.
All I am saying is your battery is lasting longer at the higher resistance, yes, but the reason is not because of the lower current going to the higher resistance coil.

The battery has a certain amount of mAh of energy.
To get 10 watts out of a 4 volt battery, the battery has to output at least 2.5 amps regardless of what resistance you put on top.
That 2.5 amps goes into the kick/buck-boost/whatever eletronics and that eletronics puts out some other voltage and some other current.

The current you get coming out of the zmax, is not the current coming out of the battery.

 

[edyle]

There may be problems with the efficiency of the booster circuits in VV devices, that could explain people getting longer battery runtime with different resistance coils?

That's exactly it. The electronics is going to be most efficient somewhere and least efficient somewhere else.

In the case of the pwm mods like my vamo, it boost volts up to 6 volts, and to get a lower rms equivalent voltage, it switches between 6 and 0 volts, maintaining 6 volts longer for higher rms voltages or shorter for lower voltages.

For 6 volts, it just goes straight to 6 volts and stays there. So I suspect that circuit might become more and more efficient the close you set it to 6 volts because it doesn't have to keet jumping up and down all the time.

 

[JeremyR]

Thanks kenD,and nice to meet you I love sweden, thier women and thier cars.

yes shorter pulls due to faster heat up most definately add to the longer run time. To get same vapor is a 6 sec draw on 1.5 of 28 - compared to 3 second draw on 3 ohm of 32 !
Either way it does work out, similar vape longer battery life. More mass take longer to reach temp at same wattage.

ie. - Apply the same number of btu's to a pot of water 1 cup will heat faster than two cups of water. Or a piece of metal same example, 1lb of steel will reach temp faster than 2lbs with same btu input.

Stick a fork in me I'm done unless op wants to discuss it further.

 

[wi11n]

Yes im a mech user, and im not trying to say anyone is wrongi just dont really understand how a vw can increase the wattage any higher without increasing the voltage. I always assumed there was a buffer that built up voltage to the desired level and then released it. I only have an mvp which only goes up to 11 watts i believe and i dont use it very much. I do understand ohms law though since im very familiar with mechs. From what I've always understood is that either ohms has to lower or volts has to increase in order to increase the watts. I guese im not sure how volts can stay unchanged and increase watts.

 

[edyle]

Yes im a mech user, and im not trying to say anyone is wrongi just dont really understand how a vw can increase the wattage any higher without increasing the voltage. I always assumed there was a buffer that built up voltage to the desired level and then released it. I only have an mvp which only goes up to 11 watts i believe and i dont use it very much. I do understand ohms law though since im very familiar with mechs. From what I've always understood is that either ohms has to lower or volts has to increase in order to increase the watts. I guese im not sure how volts can stay unchanged and increase watts.

1:
vw does increase average voltage in order to increase wattage.

2:
yes, lower ohms for the same volts will increase wattage, and
increasing volts for the same ohms will increase wattage.

3:
for volts to stay unchanged and increase wattage, I guess you'd have to drop ohms.

Maybe what you're trying to figure out is the part where the electronics inside a vv/vw mod has to drop it's own ohms (or at least have low ohms to begin with) in order to draw high power from the battery, then send it out towards the coil at a higher voltage.



So like on the vamo, if the vamo has to be able to do 15 watts at 3.2 battery voltage then
15 = 3.2 x 3.2 /r
r = 0.68 ohm
The kick/electronics has to have no more than 0.68 ohms in order to draw that power from the battery.

 

[wi11n]

I guess what im trying to ask is, how can a vw put out 11 watts with a 3 ohm coil? In order to achieve that your battery would have to put out around 5.7 volts. Most batteries at full charge can only put out 4.2 volts. Seems to me like that's not possible. And may be part of the reason why your battery life is longer. Your not actually vapeing at 11 watts. Your watts is what ever your battery will allow which on a 3ohm head is 5.8 watts max.

 

[edyle]

I guess what im trying to ask is, how can a vw put out 11 watts with a 3 ohm coil? In order to achieve that your battery would have to put out around 5.7 volts. Most batteries at full charge can only put out 4.2 volts. Seems to me like that's not possible. And may be part of the reason why your battery life is longer. Your not actually vapeing at 11 watts. Your watts is what ever your battery will allow which on a 3ohm head is 5.8 watts max.

The battery doesn't put out the 5.7 volts, its the electronics that puts that out.
The battery puts out 4 volts into a low load in the electronics;
the electronics then puts out a higher voltage into the 3 ohm coil load.

 

[Dampmaskin]

These Wikipedia articles may be useful for understanding regulated mods:

Buck converter
Boost converter
Buck–boost converter