Benefits of Using a Redundant UPS System

Business installations today, such as business centers, server farms, data centers and manufacturing processes that have critical power loads are going to demand some of the highest levels of power availability possible, which is something that is only going to be achievable by installing a modular UPS system.

In this world of parallel redundant UPS architecture, what modularity means is combining at least two different UPS systems in order to create a single UPS system that is flexible, fault tolerant and scalable. Fault tolerance coupled with modularity is absolutely crucial to the delivery of what is known as six nines availability, meaning an up time percentage of 99.9999.

The system availability, also known as up time, is essentially a measure of the time that the system is available to be used, which is typically expressed in a percentage form. Systems with high availability have a high MTBF or Mean Time Between Failures value, as well as a low MTTR or Mean Time to Repair value.

You can also express the power availability in terms of the downtime over the span of a year. For example:

  • 90 percent availability is also known as one nine availability, which translates into a yearly downtime of 36.5 days.
  • 99 percent availability is also known as two nines availability, and it translates into a yearly downtime of 3.65 days.
  • 99.9 percent availability is also known as three nines availability and it translates into a yearly downtime of 8.76 hours.
  • 99.99 percent availability is also known as four nines, and it translates into a yearly downtime of 52 minutes.
  • 99.999 percent availability is also known as five nines availability, and it translates into a yearly downtime of 5 minutes.
  • 99.9999 percent availability is also known as six nines availability, and it translates into a yearly downtime of 31 seconds.

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