This is a question for @aldoir and @canopycages
About DC-DC, in general, I would recommend using an industrial solution.
Input voltage:36V-75V
Power: 370W
Output Voltage Range:8.2V
Current: Max 45A
https://www.ebay.com/itm/370W-DC-DC-36V-75V-to-8-2V-45A-Isolated-Power-Module-Converter-module/173457682355
https://aliexpress.com/item/YIXINYOU-Adjustable-pressure-RBQ-High-power-isolation-DC-DC-voltage-converter-module-36V-75V-to-8/32869878012.html
Output voltage can be changed to 5V
