UPS Ltd has released a white paper that provides a in-depth analysis of dual bus power, considering its history, growth and purpose. Based on research from The Uptime Institute, the paper reviews the major upsides of dual bus power; enhanced Mean Time Between Failure (MTBF) and reduced chance for human error, and the downsides; higher capital investment and the additional plant-room space required to house generators, lighting and so on.
The document also provides a modern solution to legacy data centre issues. The solution is quite straightforward:
- Use high efficiency IGBT/IGBT transformer-less UPS that has high partial load efficiency
- Apply it in a scalable way that suits the anticipated initial load and anticipated load growth profie – with the aim of maintaining as high a system load as is possible by turning „off“ any over-redundant capacity.
- In one (or even both) bus turn „on“ the UPS’s eco-mode capability and virtually halve the system losses (ability to start the UPS inverter in static bypass if mode conditions dictate)
- Try to restrict the installed battery capacity on each module to under 10 minutes