Welp, killed another boost converter. This one failed by having its output voltage always equal to the input voltage no matter what, unlike previously where the boost converter failed as a direct short.

Other than this, I spent a lot of time troubleshooting the charging MPPT function, which seemed to not have proper limit and tripped whatever charger I had connected it to. Had to change the values quite a bit but nothing helped.
In the end I noticed that the initial_in_voltage variable was set to the absolute minimum trigger point whenever the charger was connected, therefore the condition where the (initial_in_voltage - in_voltage variable <= 0.2) inequation is always held true and therefore the Arduino ramped up the PWM no matter what, it took a ton of time to figure out -_-
In addition to this, I had also spent a around 2h in testing the power station regarding its thermals and max. power capability..