Folks I’ve found back the break chopper circuit made by Sawyer !! @Sawyer93 is it you by chance ?
Short word it is the end of HVC cut-off (like if you coast downhill and want to regen brake while battery is full, well you can still go at it).
We’d need to replace the halogen bulbs he uses to dry the excessive power by something more discrete IMHO. A big shunt or something similar ? A rack of high power LEDs to give it post-apocalyptic look?
And a video of how it works / what it does (see the gauges in left corner) :