volts vs wattage

[Carpe Vapor]

Seems I may have been going about this all wrong with my MVP2 then.

I was under the impression you had to set both V and W to get get within a range

However it seems it must automatically put you into either Watts or Voltage depending on what you last pressed on the device and is therefore not a case of yo having to adjust both settings.

I did think at the time when I first got it that blimey without this chart it will be an nightmare for people to figure out how to get optimal performance.

I stand corrected but glad I asked now :-)

[dakgm]

Dec 10, 2013 20:09:53 GMT Carpe Vapor said:

Seems I may have been going about this all wrong with my MVP2 then.

I was under the impression you had to set both V and W to get get within a range

However it seems it must automatically put you into either Watts or Voltage depending on what you last pressed on the device and is therefore not a case of yo having to adjust both settings.

I did think at the time when I first got it that blimey without this chart it will be an ightmare for people to figure out how to get optimal performance.

I stand corrected but glad I asked now :-)

Spot on happy vaping

[Carpe Vapor]

Thanks.

So to finalise, it is better to use the Watts setting then ?

[upnorth]

I get it now. I have bought various heads at different ohms and have a basic understanding of what works for me. 1.8 at about 3.2v 2.0 at about 3.8v 2.2 at about 4-4.2v. It does vary on juices though. Thanks for clearing that up.

[fiddles]

Dec 10, 2013 20:01:53 GMT upnorth said:

Hold on guys..... The answer I seek is there any difference. Does one give a warmer vape. The other more flavour. Excuse my ignorance I just can't seem to grasp why you would need two settings when one would do. (Input the word Muppet)

No
there is no difference in vape between watts & volts
Im VW mode it alters volts automatically dependent on atomiser

here is an example

If I was vaping on a 1.8 ohm coil at 3 volts (5 watts) then changed to a 3.0 ohm coil and not changed voltage I would be vaping at 3 watts ( 40% less power ) but if my device was set to 5 watts in VW mode when I changed atomiser my device would automatically increase volts ( to around 3.8 volts) so I was still vaping at 5 watts.

Hope this explains a bit better

[Greg]

Dec 10, 2013 19:51:43 GMT Carpe Vapor said:

I think this is where I am confused because there is no mode as such to change to (at least on the MVP2) you are simply able to change the settings yourself but they remain the same as to what you have set when you change attys

i.e. my 4.2 v and 8 watts would still be displayed when i put an 1.8 ohm coil on it, which would be slight overkill for that coil

On an MVP2 you can select either voltage or watts mode but not both. However for example if you select volts mode and set to 4.2 volts and then change to watts modes you will run at whatever watts you set. The voltage setting will still be at 4.2 volts but is inactive, if you change back to volts mode then your back at 4.2 volts active and the wattage setting is inactive.

If you have a 2 ohm atty connected at 4 volts (in volts mode) then the power to the atty is 8 watts.
If you then change the voltage to 4.2 volts still in voltage mode then power to coil is 8.4 watts.
If you now stay at 4.2 volts and change your atty to 1 ohm then power to atty coil is only 4.2 watts

Now if you set your mvp2 to 8 watts then regardless of the atty resistance I.e 1  ohm or 1.8 ohm or 2 ohm then the respective coil will always be powered at 8 watts.

The boring bit

Voltage = current (amps) * resistance (ohms)
power = volts * amps
Therefore power = volts squared / resistance

From the last equation you should see that if power (watts) is set to say 8 watts and your coil is set at say 2 ohms then your device will output 4 volts to achieve your setting of 8 watts output ie 8 watts = 4 squared / 2

I feel like I back at poly. Hope that makes sense and haven't added to the confusion. 

Maybe we need Super-Shiny to write up a how to guide on ohms law 

[Carpe Vapor]

Thanks fiddles and gregb and everyone else for sorting this numpty (me) out.

[Super-Shiny]

Dec 10, 2013 20:33:01 GMT Greg said:

Maybe we need Super-Shiny to write up a how to guide on ohms law 

Not gonna happen, when it comes to batteries and voltage/wattage it just goes right over my head....i just set a wattage and vape, if it tastes burnt i lower it like the rest

[Carpe Vapor]

Greg The maths I am good with lol It was the either watts or voltage that was doing me. I thought you had to set both to achieve the happy medium yourself and then change it all when changing to a different ohm atty.

[upnorth]

My head hurts. I grasp the principle but don't understand why you would want both settings. Wouldn't it be easier just to have the one? Sorry for all the newbie questions.

[Carpe Vapor]

so glad my provari only has one setting and now a little more happy that I only need bother with one setting on the MVP too lol

[Greg]

Dec 10, 2013 20:35:55 GMT Super-Shiny said:

Dec 10, 2013 20:33:01 GMT Greg said:

Maybe we need Super-Shiny to write up a how to guide on ohms law 

Not gonna happen, when it comes to batteries and voltage/wattage it just goes right over my head....i just set a wattage and vape, if it tastes burnt i lower it like the rest

Yes that theory works too 

But remember V=I*R
So if your in vv and you change your  coil for a different resistance then the current I must change.
As w=I2 r then clearly when you change your coil resistance then  the resultant power will change   

[upnorth]

Dec 10, 2013 20:34:13 GMT Carpe Vapor said:

Thanks fiddles and gregb and everyone else for sort this numpty out.

I hope that wasnt a go at me!!!!!

[DiscoDes]

Dec 10, 2013 20:39:56 GMT upnorth said:

My head hurts. I grasp the principle but don't understand why you would want both settings. Wouldn't it be easier just to have the one? Sorry for all the newbie questions.

Think of the wattage setting as AUTOMATIC voltage setting.

If you put a 2 ohm coiled atomiser on your MVP in wattage mode set at 8 watts then you changed the atomiser to a 3 ohm coil the MVP will Automatically up the voltage (the display will not change) so that you get a similar vape.

Wattage to me is a no-brainer as no matter what I put on a VW device I get a similar vape if I swap atomisers*

*However there will be changes in the vape as different atomisers have different air-flow, but GENERALLY it will be the same.

VV or VW is exclusive you are either in VV or VW changing the setting whilst in either mode does not affect the other mode which is disabled.

[DiscoDes]

Or another analogy is CRUISE CONTROL

VW = Cruise control on (keeps the output/speed steady) even if you hit a hill (resistance changes)

VV = Cruise off - you use the accelerator (change the voltage manually) to get to the speed you want.

HTH