The answer is not always self evident and depends on several factors. This paper provides data center owners and managers a simple framework for answering the question in the context of their own circumstances and requirements.

This paper provides guidance for deciding what to do with older three phase, uninterruptable power supplies (UPSs). The answer is not always self-evident and will depend on many factors. The primary factors are:

  • Present UPS conditions/capabilities
  • Future requirements/constraints

Once a UPS has been in service for 10 years or so, the following three options present themselves to the owner as potential options:

  1. Buy new – Should the UPS be replaced with a new one?
  2. Upgrade - Can it be revitalized in some way to extend the life and performance for several more years?
  3. Do nothing - Or is it better to do nothing beyond the most basic maintenance and just let it, in effect, “run-to-fail”?

Surprisingly, each of these options has a set of circumstances that would make it a rational choice. Each has their own set of advantages and disadvantages.

This paper will review these options in the context of the primary factors listed above. A simple step-by-step framework for making the decision is provided along with recommendations to help ensure data center managers make their decision based on a full accounting of their own requirements and constraints.