Sorry Fabio, I still don’t get. (I know I’m stubborn) But you got this nice balancing board from banggood, (https://www.banggood.com/6-String-2_7V-100F-500F-Super-Capacitor-Balancing-Protection-Board-p-1163363.htm) and put it in front of a UR18650E batteries which is used as a safety battery in a Tethered drone system.
Based on the payload and the length of the tether, the power required for hoovering could be around 500-1000w, and when safety battery engaged it needs to provide power to safely land the copter.
(correct me if I’m wrong)
For the landing we can assume that the safety battery must provide current a little below the power requirements of hoovering and handle some peaks (for counteract wind gusts and slowing the descent at the final land stage).
To keep safety battery small as possible you plan to use this capacitor bank to fill in the gaps where the power requirement of the copter is larger than the discharge rating of the batteries ?
It looks like a good idea but what happens when a wind gust force the copter to increased power need and discharge the capacitor bank. That charge will go back to the capacitors from the battery while it still keeps the copter in the air, unless you put some limiter there the current draw will be limited only by the internal resistances…
I’m not saying that is is not possible, but requires lot’s of design and test, and put’s unnecessary point of failures into a subsystem that is there for safety. A small,large discharge rated, LiPo battey that provides enough power for landing from the maximum tether height provides less complexity and more realibility. (IMHO)
One more thought. The board you pictured is for connecting six capacitors in series, which gives you 6x2.7 Volts, 16.2V (it designed for 12V car audio systems). If you use 4s battery, then a fully charged batteries will give 16.8 (16.4 if charged only to 4.1), and not counting in if you using regenerative breaking esc the voltage at the battery can be significant higher…