For the purpose of this article we are only reviewing issues regarding single-phase units in data centers. Until recently it was thought that only loads less than 20kVA could safely use a single-phase UPS. Yet most quality industrial-grade single-phase UPS are now fully capable of handling much higher kVA applications in a broader range of VDC without failure. For low- to mid-power requirements, single-phase UPS are more efficient than three-phase UPS, striking the right balance of price, energy density, power, and resiliency. Correctly specified and installed, an industrial single-phase UPS will intercept virtually any potential power disruption the data center may experience, while maintaining electricity at a consistent rate, and providing critical power in the event that the commercial power source is down.
Part 2 of this article will be featured in the next issue of Electrical Product & Solutions magazine.
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