USA, California, Long Beach: Heavy-duty freight electrification company WattEV has unveiled a solid-state transformer (SST) designed to simplify and accelerate the rollout of megawatt charging systems (MCS) for electric trucks across the United States.
Developed with partial funding from the California Energy Commission (CEC), the medium-voltage power conversion system (MV-PCS) replaces several traditional components – including step-down transformers, switchgear, and low-voltage rectifiers – with a single integrated cabinet.
The SST connects directly to 12–15 kV utility lines, converting power to DC for truck charging while eliminating much of the complex infrastructure typically required. According to WattEV, the design reduces both installation time and cost, enabling faster development of charging depots.
WattEV CEO and co-founder Salim Youssefzadeh said the technology responds to real challenges faced by fleet operators:
“As fleets work toward MCS deployment, complex equipment stacks and supply chain issues become real constraints. The SST is designed to bring megawatt charging to depots faster and more cost effectively.”
Key advantages include faster site development, lower maintenance needs, and true megawatt capacity, supporting 1.2 MW to 3.8 MW output. The modular design allows operators to add capacity as demand grows, avoiding large up-front investments.
While initially focused on heavy-duty EV charging, WattEV notes that the high-voltage architecture could also support data centres, mining, marine, and industrial DC power applications.
Production-ready SST units are expected in 2026, aligning with the rollout of MCS-capable electric trucks entering volume production that year.
Source: WattEV
