What is the most convenient way to make/buy step 66V DC down to 12V DC?
www.digikey.ca/product-detail/en/xp-power/DTE6048S12/1470-3377-ND/5931181




Input     18 ~ 75 Vdc     
Output    12Vdc 5A
High Efficiency up to 92 %
128$us  or 2$/W