I'm sorry but the other comment is more correct. 48V standard was originally created for mild hybrid systems for ICEs during mid-2000s as a stopgap solution to

I'm sorry but the other comment is more correct. 48V standard was originally created for mild hybrid systems for ICEs during mid-2000s as a stopgap solution to full hybrid transition. Looks like the earliest mass-production 48V-class system was a 2001 Toyota that ran at 36V. The integrated starter generator(ISG) is usually a pancake shaped motor that replaces clutch/torque converter in ICE car, nothing like the regular starter motor. MHV was not even real hybrid, and is no longer relevant, so was 48V, at least for a while.