SST · Solid-State Transformer
Solid-state transformer/power-electronics conversion from medium voltage toward a rack DC bus. About 98% is a named 400 kW prototype result; about 99% is a target, not a general shipping-product efficiency. Preserve topology, load point, voltage, and measurement boundary.
Power-electronics conversion integrating transformer isolation and voltage conversion; compare efficiency only for a named topology, rating, load point, voltage range, and measurement boundary.
Also written as: Solid-State Transformer
Current numbers
NEC 2029 (partial, forecast); UL certification pathway openNEC 2029 expected to add partial 800 VDC provisions (SemiAnalysis); UL opened an MV SST certification program in September 2026
~87% SST/800 VDC (analyst model) vs ~82% AC (guide fixture)Illustrative utility-to-VRM efficiency cases: SemiAnalysis May 2026 SST/800 VDC model versus the guide's assumed AC fixture
~87%SemiAnalysis’s modeled utility-to-VRM efficiency for an SST/800 VDC chain; Chapter 4.1 assumes the AC chain separately