Variable voltage mod that can handle sub ohm vaping?

[grindle]

Do the people claiming that they can output 5A with their Zmaxes have the type of Zmax that has the exact same chip as the original Vamo? Do they stack 18350s? Then the Zmax would be in buck mode and you can get past the single battery's 3.3/3.4A limit in voltage mode.

I'm not saying it'll definitely go all the way to 5A. The low load reading would probably stop it if it's lowest resistance is a 1.3ohm - then you could push a max of 4.6A. If the lowest resistance supported was 1.2ohm it could reach 5A provided the regulator had some overhead - which seems unlikely.

Has that answered it?

 

[dr g]

Do the people claiming that they can output 5A with their Zmaxes have the type of Zmax that has the exact same chip as the original Vamo? Do they stack 18350s? Then the Zmax would be in buck mode and you can get past the single battery's 3.3/3.4A limit in voltage mode.

This is not a question of the battery's limit, 5A is the output limit of the board.

I'm not saying it'll definitely go all the way to 5A. The low load reading would probably stop it if it's lowest resistance is a 1.3ohm - then you could push a max of 4.6A. If the lowest resistance supported was 1.2ohm it could reach 5A provided the regulator had some overhead - which seems unlikely.

This is my question. Specs say 1.5 ohms but that might be conservative.

 

[Thrasher]

one thing to remember, usually the limit switches are rated for amps/watts and will stop when one OR the other is reached.

 

[Technonut]

Just the fact a provari can vape 1ohm makes me want one.

Sent from my SCH-I605 using Tapatalk 2

Actually, for piss-n-giggles, I set my ProVari @ 3.9v with the 1.0 ohm dual-coil in my Hercules yesterday evening. It's been running great since without any errors. I've read that ProVape underrates their regulator, and it's true. The ProVari V2.5 is rated at 3.5 amps, but I'm running 3.9 amps / 15.2 watts. Not too shabby at all IMO..

Many regulators seem to be able to go a little above rating. Word is the provari seems to have a limit right around 15w regardless of output amps.

Update: I set the ProVari to 4.0v with the same 1.0 ohm dual-coil for over 24 hours now... 16 watts / 4 amps. vaping fine with no errors.. Voltage output confirmed with my load tester.

 

[dr g]

You might find this thread interesting: http://www.e-cigarette-forum.com/forum/rebuildable-atomizer-systems/407673-provari-ohm-limit.html

How are you measuring the coil resistance?

I find all this squeezing for a few points of watts charming

 

[Technonut]

You might find this thread interesting: http://www.e-cigarette-forum.com/forum/rebuildable-atomizer-systems/407673-provari-ohm-limit.html

How are you measuring the coil resistance?

I find all this squeezing for a few points of watts charming

Coil resistance measured by both the ProVari, and Craftsman Autoranging multimeter.. It is charming to have a well-made device which delivers more than it's advertised specs...

 

[dr g]

Coil resistance measured by both the ProVari, and Craftsman Autoranging multimeter.. It is charming to have a well-made device which delivers more than it's advertised specs...

What is the precision level of both devices (including display precision)? For example on my device the readout displays in 0.1 increments but the meter is actually metering to .01. So sometimes the power doesn't seem to make sense, until you calculate out the exact resistance ... I realized the device was more accurate than the readouts I was getting

 

[Technonut]

My coil is made from two 2.0 ohm ready-wires. I also have 2.4's, and 1.8's... I rebuild Kanger T3's with them also, and think the ProVari is more accurate at measuring than my Craftsman MM. On the ProVari, all the wires read exactly what the wires are rated. On the dual-coil 1.0 ohm, the ProVari reads 1.0... The Craftsman reads 1.1 ohms. Still close enough regardless..

 

[chaze]

Not relevant to the OP, but my SVD fired a 1.0ohm dual coil setup (2 2.0 coils). I was surprised. Though the efest 18350 battery lost quite a bit of charge. It would not fire on my MVP.

 

[dr g]

My coil is made from two 2.0 ohm ready-wires. I also have 2.4's, and 1.8's... I rebuild Kanger T3's with them also, and think the ProVari is more accurate at measuring than my Craftsman MM. On the ProVari, all the wires read exactly what the wires are rated. On the dual-coil 1.0 ohm, the ProVari reads 1.0... The Craftsman reads 1.1 ohms. Still close enough regardless..

Matching a nameplate rating isn't exactly a reliable means of confirming measurement accuracy, especially when that rating is also at the tenth-ohm resolution level.

But we've strayed from the topic, not much more to be gained from this direction of discussion.

To get back on track, the innokin 134 appears to be able to fire subohm coils, and even really low subohm ones. It lacks top end power but it can fire them.

 

[vapdivrr]

I have had a v-2 provari for a couple of years and know for a fact it runs to .8Ω. tbh I don't know if a v-2.5 is different then a v-2 provari but I just know mine as a v-2. I haven't been in the market for another vv device since so maybe they have came out with a v-2.5 which now only fires to 1Ω, but I can tell you the v-2 does fire to .8Ω. on the same note not sure why one would run this low because your loosing power. a .8 coil will only fire at 2.9v because of the 3.5 amp limit so its like 10 or 11 watts. I much prefer, on the provari, a resistance of 1.3 to 1.4Ω, at this resistance one can obtain the max power of the v-2 which is 3.5amps and 15 watts. on the other hand, about running dual coils on the v-2 and being able to go higher then the limits of the provari, not sure, something is wrong there. the max limits of the v-2 cannot be more with a single coil, so why can it happen with a dual? if one were to have a 1-ohm coil the provari will only fire it at 3.5v, maybe 3.6 at most, so why can this voltage be increased with a dual coil? either the provari only fires above the limit with duals, or the limiting factor of the 15 watts and 3.5 amps has something to do with temperature of the wires because the temp of a dual coil is the same as a single coil.

 

[Technonut]

I have had a v-2 provari for a couple of years and know for a fact it runs to .8Ω. tbh I don't know if a v-2.5 is different then a v-2 provari but I just know mine as a v-2. I haven't been in the market for another vv device since so maybe they have came out with a v-2.5 which now only fires to 1Ω, but I can tell you the v-2 does fire to .8Ω. on the same note not sure why one would run this low because your loosing power. a .8 coil will only fire at 2.9v because of the 3.5 amp limit so its like 10 or 11 watts. I much prefer, on the provari, a resistance of 1.3 to 1.4Ω, at this resistance one can obtain the max power of the v-2 which is 3.5amps and 15 watts. on the other hand, about running dual coils on the v-2 and being able to go higher then the limits of the provari, not sure, something is wrong there. the max limits of the v-2 cannot be more with a single coil, so why can it happen with a dual? if one were to have a 1-ohm coil the provari will only fire it at 3.5v, maybe 3.6 at most, so why can this voltage be increased with a dual coil? either the provari only fires above the limit with duals, or the limiting factor of the 15 watts and 3.5 amps has something to do with temperature of the wires because the temp of a dual coil is the same as a single coil.

I know what I am looking at... A 2.5 ProVari firing a 1.0 ohm dual-coil @ up to 4.0v with no errors at all... In fact, 2 ProVari 2.5's which will both fire at those settings.. I ran them @ 4.0v for 24 hours each, but keep them @ 3.8v.. I like the vape better there. For me, my mechs would drop to 3.8-3.75v under load on a fresh battery, and drop slowly every hit.. I enjoy the consistency the ProVari offers with the regulated 3.8v, and the 1.0 ohm dual coil in my Hercules..


EDIT: I'm not sure, but I imagine the ones I have would do sub-ohm.. I choose not to build my coils under 1.0 ohm.

EDIT: ProVape does state in their V1 / V2 comparison:

Because of part variations, typical unit outputs are higher than what is displayed in this table for both models.

 

[dr g]

When it comes to performance beyond specifications, it can well vary device to device.

I had actually heard before that the provari can fire subohm coils, it's the max power that is the limitation there.

 

[Keeno]

I plugged in the specs of my Caged Altoids Tin into the Ohm Law Calc I use and came up with at 30W(spec number) and a 6amp switch (spec number) a 5V limit using a .833ohm coil. Not bad for a 45.00 18650 X 2 VV basically home made mod. Whether true or not I'll probably never try it as I just don't have the want or need to for whatever reasons. It fires my duals as well which I can't say for my DNA20...it gets "wonky" with the duals.