Provari ohm limit

[FogHawg]

Yes, I was hitting 15W. Or at least as close as .1 would get me w/out going over & getting the errors. I thought I had read that 15W was the provari limit & just didn't figure the amps to see if that was actually what was inhibiting me from going higher volts. It sure appeared to be the wattage, but that wasn't it if the limit is above 15. I'm familar enough w/Ohms Law & like this online calculator:

Ohm's Law / Watt's Law Calculator

 

[FogHawg]

So is the wattage limit of a V2-V2.5 provari 15W? I had read somewhere that it was, which may have had me jumping to conclusions.

 

[Rule62]

So is the wattage limit of a V2-V2.5 provari 15W? I had read somewhere that it was, which may have had me jumping to conclusions.

Yes. The watt limit is 15W
Amp limit is 3.5A

 

[jasl90]

So is the wattage limit of a V2-V2.5 provari 15W? I had read somewhere that it was, which may have had me jumping to conclusions.

The "official" watt limit, according to Cecilia at ProVape, is 14.5 watts (& 3.5 amps). The real kicker is that there is a 3rd number that very few people seem to know about... For lack of a better term, I call it the "ProVari number"... It's the product of multiplying the watts times the amps... And it cannot exceed 50.
Both the amp limit and watt limit can, under certain conditions, be exceeded but the "Provari number" cannot... Under any circumstances.

 

[Rule62]

The "official" watt limit, according to Cecilia at ProVape, is 14.5 watts (& 3.5 amps). The real kicker is that there is a 3rd number that very few people seem to know about... For lack of a better term, I call it the "ProVari number"... It's the product of multiplying the watts times the amps... And it cannot exceed 50.
Both the amp limit and watt limit can, under certain conditions, be exceeded but the "Provari number" cannot... Under any circumstances.

Interesting. I have never heard of that. Good info.

 

[jasl90]

Interesting. I have never heard of that. Good info.

Rule... If you're interested, I can forward you the emails...

 

[Rule62]

Rule... If you're interested, I can forward you the emails...

I am interested. I've been a Provari user for a long time, this is the first I've ever heard of the "Provari Number". It makes sense though.

 

[jasl90]

I am interested. I've been a Provari user for a long time, this is the first I've ever heard of the "Provari Number". It makes sense though.

PM me a your email address and I'll forward the email string.

 

[Rule62]

PM me a your email address and I'll forward the email string.

Sent. Thanks

 

[jasl90]

Sent. Thanks

Email forwarded... Just a heads up... If I sound like an ... in the opening email, it's because I was one... I wasn't in my happy place at that specific point in time.

 

[Rule62]

Email forwarded... Just a heads up... If I sound like an ... in the opening email, it's because I was one... I wasn't in my happy place at that specific point in time.

Fascinating. Thanks. I tend to run RBAs on my Provaris at combinations pretty close to the supposed amp and wattage limits sometimes; and I have encountered this issue of exceeding the "combined power limit", on occasion; because I wasn't aware of it.

 

[jasl90]

Here's a link to a spreadsheet I threw together with all of the possible volt & ohm combos (up to 4 ohms), with PV Numbers <= 50.
It has two tabs. The 1st tab is 10th ohm increments, the 2nd is in 100th ohm increments. The idea was to step through each voltage setting and find the lowest ohm that could be fired at each setting. I quit due inconsistencies and a lack of confidence that my meters were 100% accurate to 100th ohm in the lower ranges...

https://docs.google.com/file/d/0B_0KY03Gs2knakxmTVdqUnVYT0E/edit?usp=sharing

 

[Thyroid]

Very intresting jasl90, thank you. So 2.1 ohm at 6 volts seems to be optimal after all (17.143 watts), and amps go still under 3 = better battery life I think

 

[vapdivrr]

Very intresting jasl90, thank you. So 2.1 ohm at 6 volts seems to be optimal after all (17.143 watts), and amps go still under 3 = better battery life I think

it maybe the highest wattage possible but for flavor the 1.3 is better because it would use a thicker wire. the 2.1@6v would need at least 32g and imo 32g doesnt produce as much flavor.

 

[jasl90]

One other thing... (And I've fallen for this myself...repeatedly)
Going for the highest "PV Number" or the highest possible combo of amps & watts WON'T get you the most power. (I think Vapdivrr and I are both guilty of this...)
It shouldn't be hard to find posts from either of us where we state that 1.35 to 1.4 ohms at 4.5 to 4.6 volts is the ProVari sweet spot for wringing out the max performance. (Still a damned good vape btw!)

In reality, the only number that needs to be considered is watts...
Amperage is already being taken into account when calculating watts and the PV Number is meaningless outside of understanding how the ProVari calculates its cutoff points. Dialing back the wattage to achieve higher amps or a higher PV Number is self defeating.

To test this, I just fired a 2.3 ohm length of Kanthal at 6 volts, yielding 15.65 watts (2.61 amps & 40.832 PV#). This is more power than we can get from anything in the 1.35 to 1.4 ohm range (3.35 ohms @ 4.5 volts = 15 watts, 3.33 amps & 50 PV# and/or 1.4 ohms @ 4.6 volts = 15.114 watts, 3.286 amps & 49.661 PV#).

 

[jasl90]

Very intresting jasl90, thank you. So 2.1 ohm at 6 volts seems to be optimal after all (17.143 watts), and amps go still under 3 = better battery life I think

Only in theory, yes... In reality, the ProVari cuts off at 2.3 ohms at 6 volts. I just tested this myself.
In terms of battery life... Not necessarily... The ProVari pulls more amps from the battery in order to boost the voltage. There's no free lunch. In fact, the higher you go above the input voltage, the less efficient a voltage converter will be.

 

[jasl90]

it maybe the highest wattage possible but for flavor the 1.3 is better because it would use a thicker wire. the 2.1@6v would need at least 32g and imo 32g doesnt produce as much flavor.

More power is more power. It doesn't matter what wire gauge its being applied to. 6 volts applied to a 2.3 ohm coil will get hotter, in less time, than 4.5 volts applied to a 3.5 ohm coil... It makes no difference what the wire gauge is (as long as both coils are using the same wire, of course).

Physical space limitations may make it difficult if not impossible to fit a 2.3 ohm / 28awg coil into a given RBA.

Also, please note... My last posts are based on some pretty basic math and completely ignores issues of thermal mass and heat syncing... Both of which will affect the actual coil temperature.

 

[Ferrel1134]

What's the point of having a 1.2-1.3 ohm device??

 

[jasl90]

What's the point of having a 1.2-1.3 ohm device??

Not sure I follow the question... Are you asking, "What's the point of having a device that won't fire a coil below 1.2-1.3 ohms?" Or asking, "What's the point of wrapping a 1.2-1.3 ohm coil?"

 

[donnah]

Good stuff here!