Three threats.
A. regen braking voltages
B. high standard alternator voltage 14.8-15v
C. voltage spike/load dumping
This DC-Dc is boost/buck so it will output your choice voltage as you set it to, regardless of input voltage higher or lower, for A or B, and for C , more here:
about Li and alternator. Scroll way down to "Alternate Uses"
About "load dumping", BMS, damaged alternator, voltage spikes, etc.
I do not know how this relates to regen braking voltages.
I am not clear if the alternator is on the engine battery too, if it would be a "load dump" if the Li House BMS shut it off.
(Easy for me--I don't have Li, plus with my Si, I don't have alternator charging as a choice I made--pulled the Stud 1 fuse for pin 4.)
So this is for those who might care :)---or start to care after your new, modern set-up fries itself (if it would-)
https://marinehowto.com/understanding-the-sterling-power-pro-batt-ultra-battery-to-battery-charger/
