DIY e-bike keep killing arduino and buck converter
I am modifying my homemade e-bike and have installed an arduino for converting the throttle and brake signal and feeding them into a 500W BLDC controller ( with regen braking). I am powering everything from a 36V 13.7 Ah Li ion battery that is connected to a step down buck converter ( first one rated for 60V, the second one for 50V) witch then power the arduino through the Vin and Gnd port. The first time I tried this setup, everything worked until the bike hit the sideways, witch somehow killed the buck and the arduino ( see the picture it literally blew pinholes through the chip). I then swapped both the buck and the arduino and it worked perfectly until I decided to pedal with the battery switch open to save a bit of electricity, doing so I noticed that the motor still generated enough electricity to power on the buck and the arduino, witch allowed me to use the regenerative brake, then the buck and the arduino died again. I really don’t understand how this happened, since I used the bike and the regen braking all morning and nothing happened then.
Maybe there is something obvious that I missed, I am a beginner in electronic and I really don’t understand what is happening.
(First post on reddit btw)