is there a vv pv that can run more than 15 watts?

[AttyPops]

I asked around a bit too...so far one response:

The HV option on the VV Saber Touch has a 5A max. That's the option I got on my ST, which I got back when I wanted to be a high wattage vaper, you know, when I grew up . I've resigned myself to the fact that with my juice, I'm a ::sigh:: low wattage vaper.

Hmmmm, I think mech mods and ultra low ohm atties are just a disaster waiting to happen . But I could be wrong

If you go the mech route, make sure that you have:
A) A well vented PV (Suggest box mod)
B) know the specs on the specific batteries used...like per the manufacturer and make sure it can handle the amps stacked.

Also, there's a guy selling 28 ga vivi nova heads that go up to 2.4 ohms (using SS mesh, 28 ga resistance wire) so maybe it's as much a wrapping thing as anything else. IDK, haven't tried it.
http://www.e-cigarette-forum.com/fo...m/385705-vivi-nova-heads-ss-400-batch-ii.html

 

[Jerms]

I asked around a bit too...so far one response:




If you go the mech route, make sure that you have:
A) A well vented PV (Suggest box mod)
B) know the specs on the specific batteries used...like per the manufacturer and make sure it can handle the amps stacked.

Also, there's a guy selling 28 ga vivi nova heads that go up to 2.4 ohms (using SS mesh, 28 ga resistance wire) so maybe it's as much a wrapping thing as anything else. IDK, haven't tried it.
http://www.e-cigarette-forum.com/fo...m/385705-vivi-nova-heads-ss-400-batch-ii.html

Wow, it takes over 5 inches of 28 ga wire to hit 2.4 ohms. That's probably what, 15 wraps on a 3mm wick? Wonder how he pulls that off in a viva head.

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[AttyPops]

Yeah, well he did say 2.0 - 2.4 so, it is a range...still, point taken.

 

[arh32]

I am not a low watt vaper, but untill someone makes a mod i think i will stick with provari. I would probable blow my self up if i tried. HAHA I think on my next set up i will up the ohm maby and see how she does.

 

[Jerms]

I am not a low watt vaper, but untill someone makes a mod i think i will stick with provari. I would probable blow my self up if i tried. HAHA I think on my next set up i will up the ohm maby and see how she does.

Higher ohm will give you longer battery life as you'll be drawing less amps. About 1.5 ohm of 30 ga at 12 watts seems to work better on my VAMO than 1.2 ohm. Maybe even consider going for a slightly thinner wire like 29 ga. It would be more responsive than the 28 ga and run hotter with the 15 watt limit, and taste would be improved over 30 ga.

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[junkman]

Higher ohm will give you longer battery life as you'll be drawing less amps. About 1.5 ohm of 30 ga at 12 watts seems to work better on my VAMO than 1.2 ohm. Maybe even consider going for a slightly thinner wire like 29 ga. It would be more responsive than the 28 ga and run hotter with the 15 watt limit, and taste would be improved over 30 ga.

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Ohms law says that for a given watt output, you use the same energy input, so I don't think battery life should be affected. Of course it can depend on the efficiency of the buck circuit, but I don't think altering resistance while maintaining the same wattage is generally considered effective at extending battery life.

 

[Jerms]

Ohms law says that for a given watt output, you use the same energy input, so I don't think battery life should be affected. Of course it can depend on the efficiency of the buck circuit, but I don't think altering resistance while maintaining the same wattage is generally considered effective at extending battery life.

When running the same watts through a higher ohm coil you are using less amps making for longer battery life. For example:

4.24v at 1.2 ohms = 15 watts using 3.5 amps for .5 hours continuously running on a 2400mAh battery

5.05v at 1.7 ohms = 15 watts using 3 amps for .61 hours on the same battery.

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[AttyPops]

Another way to say it...

Watts = volts * amps. So amps can stay the same, while voltage increases and so do the resulting watts. The real issue then becomes "How does the voltage get increased?" If you're using a buck regulator and stacked batteries...it's limited that way. Easy. Efficiency plays into it of course. But for a booster...IT DRAWS EXTRA AMPS! lol.

 

[arh32]

Higher ohm will give you longer battery life as you'll be drawing less amps. About 1.5 ohm of 30 ga at 12 watts seems to work better on my VAMO than 1.2 ohm. Maybe even consider going for a slightly thinner wire like 29 ga. It would be more responsive than the 28 ga and run hotter with the 15 watt limit, and taste would be improved over 30 ga.

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Good idea...i have been wanting to try the 29ga out.

 

[Jerms]

Good idea...i have been wanting to try the 29ga out.

I've been meaning to try the 31 ga myself. Harder to find these odd numbers in smaller quantities but it's out there.

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[Rader2146]

When running the same watts through a higher ohm coil you are using less amps making for longer battery life. For example:

4.24v at 1.2 ohms = 15 watts using 3.5 amps for .5 hours continuously running on a 2400mAh battery

5.05v at 1.7 ohms = 15 watts using 3 amps for .61 hours on the same battery.

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You have one half of the battery drain equation correct....

http://www.e-cigarette-forum.com/forum/blogs/rader2146/3500-calculating-battery-drain-current.html

 

[Jerms]

You have one half of the battery drain equation correct....

http://www.e-cigarette-forum.com/forum/blogs/rader2146/3500-calculating-battery-drain-current.html

I would be lying if I didn't say that write-up isn't over my head lol. So efficiancy losses is what I was missing? Does raising the ohms and using the same watts make for better or worse battery life when using a VV APV?

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[Rader2146]

Efficiency loss is one factor that will affect battery life, but it's largely unknown unless you do the measurements yourself or have a datasheet for the specific regulator that you are using (like the PTR08100 used in the evercool mods). Efficiency also changes based on conditions. Some regulators are more efficient at lower voltages and higher current, some at higher voltages and lower current, and some at any combination in between. It makes it impossible to say that any one condition is better for battery life compared to another condition.

The main point of that write-up is that the common practice of assuming that output current is the same at input current is wrong. Energy cannot be created or destroyed, only transformed. That means that output power must be equal to input power. The voltage and current are transformed to the desired output, and if the output voltage is higher than the input voltage it will require more current from the battery in order to convert the low voltage to high voltage. The inverse is also true, if the battery voltage is higher than the desired output voltage, it will take less current from the battery to convert high to low.

It all boils down to: For a VV/VW device, it doesn't matter what resistance you use. Battery drain current will be the same for any resistance.

 

[Jerms]

Thanks, great information there!

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[Jerms]

My VAMO sure does a lot better job lowering the power than raising it. I just set up a 1.2 with 30ga Nichrome 80 and with a full battery it was only giving 11 watts, maybe less, even though set at 15 watts, and was a very poor vape. Stacking 18350s lets me do 14 watts with a huge difference in vape quality and response time.

What a difference a couple watts makes.

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[AttyPops]

My VAMO sure does a lot better job lowering the power than raising it. I just set up a 1.2 with 30ga Nichrome 80 and with a full battery it was only giving 11 watts, maybe less, even though set at 15 watts, and was a very poor vape. Stacking 18350s lets me do 14 watts with a huge difference in vape quality and response time.

What a difference a couple watts makes.

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You're using good IMR high drain batteries, yes?

 

[AttyPops]

Nice blog write-up Radar. Good explanation of why boosters draw more current on the input side. Ya don't get something for nothing! Basically, "Robbing Peter to pay Paul".

Still, arh32, voltage rocks when you're talking about coil response time. Voltage = oomph ("push"... potential diff) (Yes you could say watts rock too. But the point is...more is better in the 28 ga case).

 

[AttyPops]

There's a response on the evercool mod with more amps:
http://www.e-cigarette-forum.com/fo...quality-look-great-price-177.html#post9157344

 

[Jerms]

You're using good IMR high drain batteries, yes?

Yep, AW brand IMRs, mated by using and charging together.

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[arh32]

Nice blog write-up Radar. Good explanation of why boosters draw more current on the input side. Ya don't get something for nothing! Basically, "Robbing Peter to pay Paul".

Still, arh32, voltage rocks when you're talking about coil response time. Voltage = oomph ("push"... potential diff) (Yes you could say watts rock too. But the point is...more is better in the 28 ga case).

Oh for sure Turn it uupppppp!!!!