Delta Electronics Launches 800V HVDC System to Address Megawatt-Level Power Consumption of AI Racks
N.R. Finch
Delta Electronics warns that AI server racks are approaching 1 MW each — equal to 2,000 household refrigerators — and says existing AC-DC power architectures will hit a physical wall within two years. The company's response: a full 800V high-voltage DC system, signaling a forced rebuild of the data center's electrical backbone.
One rack draws as much as 2,000 fridges — why can't today's power setup cope?
AI server power per rack is approaching 1 megawatt (MW), equivalent to 2,000 household refrigerators running at once.
Legacy 50V distribution at that load creates unmanageable current and cable bulk. This means → the bottleneck is not efficiency — it is physics.
Delta's call: a shift to 800V high-voltage DC (HVDC) is unavoidable within one to two years.
Why is the solid-state transformer the linchpin of the new architecture?
Delta positions the solid-state transformer (SST) — a device that replaces traditional iron-core transformers with power electronics, smaller and programmable — as the critical component of HVDC.
In plain terms = legacy power delivery passes through multiple voltage "relay" stages before reaching the chip. The SST converts medium-voltage AC to 800V DC in one step, at up to 98.5% efficiency.
The design scales via parallel modules to a planned maximum of 10 MW. This means → a single system could theoretically power a mid-size data center.
How far along is this system today?
SSTs are already deployed in DC fast-charging and industrial settings, and have reached volume production in Chinese data centers.
Delta is running tests with a major U.S. cloud provider, unnamed.
The company says technical barriers are limited; the real bottleneck is safety and regulatory certification — each customer and site has different requirements.
From 800V to the chip — how is the last mile solved?
Delta describes high-efficiency converters that step 800V directly down to 50V or 12V, each unit delivering 12 to 15 kilowatts.
In plain terms = voltage used to pass through several "middlemen" before reaching a level the chip could use. Now those intermediate stages are largely eliminated.
Fewer conversion stages. This reflects a broader design shift across the power chain: from "convert layer by layer" to "get there in as few steps as possible."
Digital twins and energy savings — what else is Delta building?
Delta is applying Omniverse-based digital-twin technology to factory, building, and transport scenarios, including deployment on a Thai AI server production line.
The company claims up to 20% energy savings in smart-building applications.
This means → Delta's ambition goes beyond selling power supplies. It aims to embed itself across the data center value chain, from power delivery to operations. Certification progress and cloud-provider test results are the key milestones that will determine whether this architecture reaches commercial scale.
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