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System Architecture and Reliability

Which is the reason for combining a UPS (uninterruptible power supply) with on-site generators in a data center?

  1. AThe UPS is for long outages and the generators are for momentary voltage dips
  2. BThe UPS batteries bridge the time from the start of an outage until the generators start and their power stabilizes, and the generators then take over the long-duration supply
  3. CUsing the UPS and the generators at the same time reduces the power consumption of the IT equipment
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Answer: B. The UPS batteries bridge the time from the start of an outage until the generators start and their power stabilizes, and the generators then take over the long-duration supply

On-site generators can supply power for a long time as long as they have fuel, but it takes time to detect the outage, start up, and stabilize the voltage and frequency. A UPS can supply power without interruption from the moment of an outage using energy stored in batteries or similar, but only for a limited time. They are therefore combined so that the UPS bridges the short time right after an outage and the generators take over the long-duration supply.

  • A. The roles are reversed. The UPS covers the short time and the generators cover the long time.
  • B. Correct. The UPS bridges the time until the generators stabilize.
  • C. Combining them does not reduce the power consumption of the IT equipment.
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