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Which system voltage is used in mild hybrid vehicles?

  • A.Forty eight volts
  • B.Twenty four volts, which is the same arrangement used by heavy commercial vehicles and therefore well established
  • C.Four hundred volts
  • D.Twelve volts with a larger alternator, which supplies the additional power required by the starter generator unit

Answer: A

Forty eight volts allows a belt driven starter generator of several kilowatts while staying below the threshold at which shock protection becomes onerous. Full hybrids use four hundred volts. The sixty volt safety threshold determines the choice. Naming what changes and what stays the same is the reliable route through questions of this shape. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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