Rebuilt coil on Pro Tank Aero....

[wagon52]

Hello all,


I just rebuilt a couple coils on my Pro tank Aero. I made them single coil with cotton wicks and both of them came out to be 1.2 and 1.3 ohms. I am using them on a ProVari 2.5. My question is...is that ohm range safe for that mod? It fires fine and seems to be ok. I am firing it at between 3.0 and 3.3 volts. I just don't want to screw something up or have a major catastrophe. Thanks in advance.


Still a somewhat noob.

 

[Ryedan]

1.2 - 1.3 ohms is just fine on a Provari you just won't be able to use it at too many volts. I have not tried it myself, but people report around 1.0 ohm as the lowest. It will stop firing if you go too low without hurting itself.

You will not get much out of going really low though. The Provari is power limited to 14 watts I think anyway, so if you go a bit higher in ohms you can get more volts out of it bringing the watts back up. At 3.3V you are not close to that, just thought I would mention it.

Vape on

 

[100%VG]

Hi Wagon52,

To figure what the Wattage will be, you can use this formula, knowing Volts and Ohms . . .

Watts = Volts² / Ohms

As long as your Coil is within the working range of your ProVari, and you don't exceed the Max Wattage rating, you should be fine.

According to this http://www.provape.com/v/images/ProVariV1vsV2.pdf, the ProVari V2 is a 14.5W Device, and the Max Current is 3.5 Amps.

The above formula is derived from the two main electrical equations of:

Volts = Amps * Ohms

Watts = Volts * Amps

We solve for Amps in the first equation (Volts = Amps * Ohms) like this . . .

Amps = Volts / Ohms

Now we substitute this for Amps into the second equation (Watts = Volts * Amps) like this . . .

Watts = Volts * Amps

Watts = Volts * (Volts / Ohms)

Watts = (Volts * Volts) / Ohms

and we get . . .

Watts = Volts² / Ohms

You set the Volts on the ProVari, so you know the Voltage. You made the Coil, so you know the Ohms. Plug those two numbers into this equation, and you can know the Max Safe Voltage for your ProVari with any Coil, as long as the Coil is in the working range.

Using 3.3V on your ProVari with a 1.3Ω Coil, you are drawing 8.377W by the calculation.
Using 3.3V on your ProVari with a 1.2Ω Coil, you are drawing 9.075W by the calculation.

You can see by the formula (and the results above), that as Ohms go down, Watts go Up. You still have some Voltage range left for Safe operation of your ProVari with these Coils. Do the math, and don't push beyond 14.5W.

I hope this helps, and Good Luck.

EDIT:
To figure the Amps that will be drawn, use Amps = Volts / Ohms. Therefore, 3.3V / 1.2Ω = 2.75A.

You have two limits where the ProVari may stop working... exceeding Max Amps or Max Watts. But if you have a V2, your Max Watts will be limited to 14.5W, and the Device will still work, according to the above PDF.