See, I've actually seen it on a scope, so I know that 20 watts is only attainable at 1-1.1 ohm, and I also know that over 20 watts isn't attainable. It runs higher then settings at low end, and levels out as you reach the upper end, and with higher then 1.1 ohm, starts to give lower then your settings, depending on what ohms you are at will dictate what wattage it starts to give lower readings.
Oh, do the math and you will find that at 5.5 volts, on a 1.6 ohm coil..... You will get 18.9 watts
Sent with one hand, the other is busy vaping.
I too put my iSticks on a scope and have screen shots to prove it. Do you know that the peak voltage changes @ 66% of the settings when it loses approximately 1/3 of the battery charge?
The iStick, indeed, maxes at 4.5A. At 1.6Ω, it fires 5.5Vavg or 5.6xVrms, totaling 19.6-19.9W
The maximum wattage of the iStick (in vv mode)is:
1Ω: 26.1W (21.6W @ 2/3 batt charge)
1.1Ω: 25.8W
1.2Ω: 26.1W
1.3Ω: 24.5W
1.4Ω: 22.8W
1.5Ω: 21.3W
1.6Ω: 19.9W
If you have any doubt of this, watch Mr. Busardo's video. My findings agree with his completely. His testing did not catch the lowered peak voltage at reduced battery charge however.
I run my RDAs at 1.2Ω, giving me a range of 14.5-26.1W.
I run my RTAs at 1.5Ω, giving me a range of 11.6-21.3W.
I run my rebuilt BVC clearos at 1.9Ω, giving me a range of 9.2-16.8W.
The above numbers are with the full charge. At approximately 2/3 battery charge, any set voltage below 4.9, provides noticeably lower power dissipation at the coil.
The take away from all this? Most users should run >1.8Ω coils and simply vape by taste/feel. The math/physics will cross our eyes.
Hope this helps!