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By: ABB
The rapid expansion of AI applications is driving server rack power demands into the megawatt range, placing unprecedented strain on traditional AC power systems. These high-power requirements are pushing AC infrastructure to its physical limits.
With multiple power conversion stages inherent in AC distribution, the ratio of grey space (infrastructure) to white space (computing) is reversing—undermining the energy efficiency and footprint of electrical distribution for large AI data centers.
As power loads increase, so do the challenges of cable management and distribution losses due to high currents. Existing voltage levels necessitate oversized conductors, inflating both capital and operational expenditures.
While AC distribution remains ideal for legacy data centers based on CPU workloads, the emerging higher power density GPU workloads for AI data centers will require different power system architectures.
This industry shift to higher power density makes low-voltage direct current (LVDC) distribution at 800 VDC a more suitable and efficient choice, especially for advanced AI-optimized data center architectures. Since 2013, marine vessels use LVDC systems with 1000 VDC and up to 20 MW, reporting 20–40% energy savings and up to 30% lower maintenance costs1.
In other sectors, LVDC has improved conductor utilization by up to 20%2 and reduced feed-in power requirements by a factor of two to five3. These systems offer immediate benefits in power availability, distribution efficiency, and infrastructure density, with proven reliability in real-world operations.
Transitioning from traditional 480 VAC or 415 VAC to 800 VDC 4 distribution enables a more efficient, resilient, and scalable power architecture—essential for the next generation of AI-driven data centers. The use of 800 VDC also reduces conductor size and material usage (copper and aluminum), enhancing both cost and resource efficiency.
Operating safely within the internationally recognized LVDC envelope, 800 VDC (or +/- 400 VDC) is supported by industry alliances such as OCP, ODCA, and Current/OS, which provide implementation frameworks and best practices.
Industry leaders like NVIDIA have already embraced 800 VDC architectures, as highlighted in their technical publications—underscoring the urgency and relevance of this transition.
References
About the authorsPavel Purgat is responsible for developing emerging direct current technologies at ABB. Pavel has a doctorate in sustainable electrical engineering from the Delft University of Technology and has served as a visiting researcher at Fraunhofer IISB. He serves as technical chair and committee member on numerous international conferences in the field of power electronics.
Thorsten Strassel is Product Owner for Emerging DC applications and Global Product Manager for Low Voltage Solid-State Circuit Breakers at ABB. Thorsten studied physics, has a doctorate from Ruprecht-Karls Universität Heidelberg, and holds several patents in the field of novel direct current switching technologies. He is also an ODCA board member.