WattEV has introduced a solid-state transformer, a compact, medium-voltage power conversion system designed to accelerate installation of megawatt charging system fast chargers for heavy-duty electric trucks.

The system, funded in part by the California Energy Commission, was developed to replace traditional step-down transformers, switchgear, and low-voltage rectifiers. 

It is designed for installation on service islands between pass-through charging lanes, supporting the next generation of megawatt charging system-capable trucks expected to enter volume production in 2026.

Simplified Design for Faster, Lower-Cost EV Charger Installation

Unlike conventional 480-volt systems, WattEV’s solid-state transformer integrates power conversion and cooling in a single cabinet. The design connects directly to utility medium-voltage lines (12,000 to 15,000 volts), eliminating the need for multiple intermediary components, according to the company.

This direct connection simplifies installation and reduces both equipment and labor costs associated with site development.

“As fleets move toward megawatt charging, complex system requirements and supply chain constraints have become real challenges,” said Salim Youssefzadeh, CEO and co-founder of WattEV, in a release.

“The solid-state transformer helps bring megawatt charging to heavy-duty depots faster and at lower cost.”

Versatile High-Voltage Architecture

While the solid-state transformer is primarily designed for electric truck charging, WattEV said its high-voltage DC architecture is also applicable in other sectors, including data centers, marine power, mining operations, and industrial systems requiring large-scale direct current.

Key Benefits for Fleet Electrification

• Faster site development: Replaces multiple components with one integrated system, reducing engineering and installation time.

• Lower installation and maintenance costs: Fewer parts mean less procurement, setup, and service complexity.

• High-capacity output: Converts medium-voltage power (12–15 kV) directly to DC, delivering between 1.2 and 3.8 megawatts.

• Modular scalability: Allows operators to expand capacity incrementally as charging demand increases.

Production Timeline

WattEV has completed its proprietary solid-state transformer design and expects production-ready units in 2026. 

As fleet and public charging infrastructure expand nationwide, the transformer can provide a practical, cost-efficient approach to deploying megawatt-level charging systems, enabling depots and logistics hubs to scale more easily, according to the company.