Eleaf Istick Chart of Power Output vs Requested Output -- can't down-regulate

peraspera;14200257 said:

I made a new chart showing what combinations of oHms/watts the istick is capable of regulating. eleaf/Joye U.S. confirmed with the manufacturer that the iStick does not have the capability to down regulate power.

The blue bars show what is fully regulated. The purple shows oHms/watts combos that are only regulated when the power level you have selected falls below the volts the battery is actually outputting. If the settings you have chosen are too low to be regulated the iStick screen shows values calculated from oHms law based on your chosen settings rather than showing the actual power coming from the battery that is going to the coil.

For example, if you are using a 1.8 oHm coil the iStick will fully regulated your vape between 10 and 16 watts. However, if you want to vape your 1.8 oHm coil at 7 watts you can not do so until the battery output falls below 3.6 volts. In practice, this would mean you would start vaping at 10 watts with a freshly charged battery with the temperature of the vape going lower until the battery was actually outputting below 3.6 volts. The iStick would then regulate your vape at 7 watts until the battery needed to be recharged. The screen will reflect 7 watts/3.5 volts irrespective what volts are actually being output to the coil.

Using the iStick in voltage mode doesn't change the fact that the iStick is not capable of reducing the power coming from the battery. If the battery is freshly charged, producing around 4.2 volts, and you have set the voltage to 3.8 the iStick will be delivering 4.2 volts, not 3.8 volts, to your coil.

The iStick will not allow you to select a power setting that requires more volts than is allowed in its regulated range. It will stop at the highest setting that the chip can regulate.

You can download the spreadsheet I used for the underlying data if you wish to look at it or modify it for another device. Choose File > Download as from inside the Google spreadsheet itself rather than your browser's menu. The colors on the spreadsheet are done with conditional formatting that matches spec limitations.

The data I used is from doing oHms law calculations. The device may produce something a bit different in actual use. So far, I haven't seen any reviews for the iStick using reliable electronic testing equipment to check its accuracy.

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