Piller’s kinetic energy stores are a perfect partner for contemporary diesel generators, which are faster-starting and far more reliable than their predecessors.
It is a common myth that using batteries as the interim energy store to bridge the gap between mains failure and engine start somehow adds to the reliability of the overall system. That was true some years ago when engine starting was far less reliable and when modern data centres did not exist.
Fast forward now to the days of virtual redundancy, unmanned facilities and more complex shutdown procedures and the focus needs to be not on the duration of the interim ride-through available but on the dependability of the ride-through. That’s become even more important as an increasing focus on cost has driven layers of margin out of the typical data centre design. Today, battery failure and unpredictability is no longer an option that can be overcome by long duration autonomy and excessive redundancy.