800V DC data centers still need standby power, MS note says
BenBajarin · x · 2026-07-28
An MS note on Cummins argues that the shift to 800V DC data center architecture does not remove the need for standby backup power.
Key points from the excerpt:
- 800V DC is mainly about rack density and data hall architecture, not about eliminating backup generation.
- What changes is the alternator configuration on the engine side; Cummins already has manufacturing strength there.
- BESS (battery energy storage systems) can help with load following and peak shaving, but their limited duration makes them a poor standalone substitute for standby power.
- The likely setup is a layered power stack: BESS handles short-duration volatility, while diesel remains the redundancy layer.
- The note says Cummins could benefit because BESS products span roughly 200kWh to 2,280kWh, with a 5MW platform in development.
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