Charging and the Wunderbox | Tech Talks | Lucid Motors

Lucid Air Charging and the Wunderbox

Eric from Lucid Motors explains how the Lucid Air charges and how its Wunderbox manages power throughout the vehicle. He describes the system as a hub for high-voltage power flows, connecting the charge port, battery, drive unit, climate systems, and other components.

Charging Performance and Efficiency

• In a cited charging test, the Lucid Air added 100 miles in 6 minutes, 200 miles in 12 minutes, 300 miles in under 22 minutes, and 416 miles in 37 minutes. Eric also says the car exceeded 300 kW during the initial stage of charging.
• Charging speed depends not only on the power supplied by the charger but also on vehicle efficiency. Eric gives the Grand Touring model’s figures as 516 miles from a 112 kWh battery, or about 4.6 miles per kWh.
• The vehicle’s navigation planner can find a DC fast charger along a route. Plug & Charge can authenticate a Lucid charging plan when the car is connected to a compatible network.

Home and Public Charging

• The included mobile charging equipment supports up to 9.6 kW with a NEMA 14-50 connection. A 110-volt adapter is described as providing up to 1 kW.
• Lucid’s home wall box is described as delivering up to 19.2 kW on a 100-amp breaker.
• For DC fast charging, the car uses a CCS Combo connector. At sufficiently high-voltage stations, the Wunderbox can connect the charger directly to the battery. At older, lower-voltage stations, its onboard boost-charging capability can raise the voltage, with a stated capacity of up to 50 kW.

High-Voltage Architecture and Charging Limits

• Eric describes the battery pack as using 220 cells in series and a 924-volt architecture. He gives the pack voltage as roughly 700 volts at low charge and 924 volts when full.
• At about 300 kW, the car charges at roughly 840 volts and 360 amps. Eric contrasts this with a 420-volt system, which would need about 720 amps to deliver the same power. Because CCS charging is described as limited to 500 amps, he says a 420-volt vehicle would be limited to around 210 kW under those conditions.
• Battery charging must balance current, voltage, temperature, state of charge, and cell history to charge quickly while preserving cell durability. Lucid develops its battery-management and charging-control software in-house and can update it over the air.

What the Wunderbox Contains

• The Wunderbox’s die-cast aluminum housing provides protection and contributes to chassis stiffness, crash performance, and reduced noise, vibration, and harshness.
• Its control electronics manage DC fast charging, Plug & Charge communications, AC charging, and boost charging. Silicon-carbide switching devices help reduce losses.
• The onboard AC charger converts household or public AC power into DC for the battery. Its two-stage design uses active rectification, which Eric says improves efficiency, enables power to flow in reverse, and allows the system to be reconfigured for boost charging.
• The unit also includes a high-voltage junction box with contactors and fuses, plus a medium-voltage power supply that provides 400 volts for the heater and air-conditioning compressor.
• Locating high-current connections close together reduces conductor length, resistance, heat, weight, and cost, according to Eric.

Bidirectional Charging

The Wunderbox’s ability to reverse power flow enables several vehicle-to-everything applications:

• Vehicle-to-vehicle (V2V): A demonstration shows one Lucid Air supplying power to charge another using an adapter and the mobile charging cable.
• Vehicle-to-home (V2H): With Lucid’s connected home charging station and additional residential equipment, the car can supply household power, potentially use stored solar energy at night, or provide backup during an outage when the home is disconnected from the grid.
• Vehicle-to-business (V2B): Eric describes using multiple cars to help offset peak building demand or shift electricity use.

Reviews, Guides, and Demonstrations

• This is a technical explainer and product demonstration, not a hands-on review or step-by-step charging tutorial.
• Eric references an independent charging test and demonstrates the V2V charging function.
• He also presents a San Francisco-to-San Diego trip-planning example, including charging, cost, and emissions comparisons. These comparisons are presented as examples in the video.

Main speaker/source: Eric, speaking for Lucid Motors.