WattEV has unveiled a new solid-state transformer (SST) designed to simplify and accelerate the rollout of megawatt charging systems (MCS) for heavy-duty electric trucks, a key milestone for fleet depots and public charging hubs preparing for next-generation vehicle deployments.
Developed with funding support from the California Energy Commission (CEC), the medium-voltage power conversion system (MV-PCS) replaces traditional step-down transformers, switchgear, and low-voltage rectifiers with a single, compact unit. The modular design allows utilities to feed 12-15 kilovolt lines directly into the liquid-cooled SST cabinet, reducing equipment needs, installation time, and maintenance costs.
“As fleets work toward MCS deployment, complex equipment stacks and supply chain issues along with tariffs become real constraints,” said Salim Youssefzadeh, CEO and co-founder of WattEV. “The SST is designed to bring MCS to heavy-duty depots faster and more cost effectively.”
The technology provides direct conversion from 12-15 kV to DC power at 1.2 to 3.8 megawatts, enabling true megawatt-scale charging without additional step-down stages. WattEV says the system’s integrated approach could lower site build costs and shorten deployment timelines for both private fleet facilities and public charging corridors.
The SST’s architecture also has potential applications beyond trucking, including data centers, mining, marine, and industrial operations that require high-capacity DC power.
WattEV has completed its proprietary SST design and expects production-ready units in 2026, aligning with the market introduction of MCS-capable heavy-duty trucks.
