What is the role of the 12V auxiliary battery in an EV when the HV system is present?

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Multiple Choice

What is the role of the 12V auxiliary battery in an EV when the HV system is present?

Explanation:
The energy that actually drives the wheels in an EV comes from the high-voltage traction battery. The 12V auxiliary battery serves the low-voltage electronics and accessories—things like lights, instrumentation, infotainment, sensors, and safety systems. A DC-DC converter takes power from the high-voltage pack and converts it down to 12V to keep the auxiliary battery charged and the 12V electrical loads running. Because of this setup, the 12V battery does not provide propulsion energy; propulsion is powered by the high-voltage system.

The energy that actually drives the wheels in an EV comes from the high-voltage traction battery. The 12V auxiliary battery serves the low-voltage electronics and accessories—things like lights, instrumentation, infotainment, sensors, and safety systems. A DC-DC converter takes power from the high-voltage pack and converts it down to 12V to keep the auxiliary battery charged and the 12V electrical loads running. Because of this setup, the 12V battery does not provide propulsion energy; propulsion is powered by the high-voltage system.

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