EVITP Technology and Equipment 3

Question 1

Which standard governs the wireless charging (inductive) of electric vehicles in North America?

Accepted Answer

SAE J2954

Answer

SAE J2954 is the standard that defines wireless power transfer (WPT) for light-duty plug-in and electric vehicles, including interoperability and safety requirements.

Question 2

In a bidirectional charging setup (V2G), what additional capability must the EVSE hardware include compared to a standard charger?

Accepted Answer

An inverter capable of converting DC from the vehicle battery back to AC grid power

Answer

V2G (Vehicle-to-Grid) requires the EVSE to include an inverter so that DC energy from the vehicle battery can be converted back to AC for export to the grid.

Question 3

What is the maximum voltage output specified for a CHAdeMO DC fast charger?

Accepted Answer

500 V DC

Answer

Standard CHAdeMO chargers specify a maximum output of 500 V DC, though the newer CHAdeMO 3.0 (ChaoJi) extends this significantly.

Question 4

Which type of thermal management is most effective for protecting EVSE power electronics in high-ambient-temperature outdoor installations?

Accepted Answer

Liquid cooling of internal power modules

Answer

Liquid cooling of internal power modules provides the most effective thermal management for high-power EVSE in hot outdoor environments, enabling sustained output without derating.

Question 5

What does the term 'charging curve' refer to in the context of DC fast charging?

Accepted Answer

The relationship between the vehicle's state of charge and the accepted charge power over time

Answer

The charging curve describes how accepted power (and current) changes as the vehicle's battery state of charge increases during a fast-charge session.

(EVITP) Electric Vehicle Infrastructure Program Practice Test

(EVITP) Electric Vehicle Infrastructure Program Practice Test

EVITP Technology and Equipment 3