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Improving PUE with the Use of Battery-Free UPS
Lead acid batteries are the most common form of energy storage for backup power in data centres and other large critical power users such as hospitals. Flooded (wet) cells can be used and they offer a long life but they are expensive in terms of purchase price and require extensive regular maintenance. VRLA (sealed) batteries offer a cheaper alternative but have a shorter life of five to seven years (in ideal conditions) and require regular checking to make sure that bad cells are exchanged. Customers that want an alternative form of energy storage that doesn’t contain lead or acid have a limited choice of various rotary (flywheel) systems.
Eliminating Battery Back-Up Power
Engineers at PNU Power have harnessed the energy stored in compressed air to provide backup power in high voltage electricity substations. Reduced maintenance costs, elimination of hazardous lead acid batteries, and the need for outside installations were all driving factors for the UK and USA National Grid to look for an alternative to the traditional lead acid battery for backup power. The PnuPower Compressed Air UPS provides a battery free solution to their backup power needs.
Prototype Test Report for National Grid US
Environmental performance report on a Pnu Power unit, using National Grid US Prototype Test Specifications.
Evaluation of TC3 Standby Power Unit for Energetix Pnu Power Limited
Technical report on the performance of a Pnu Power Compressed Air Battery by Dr. Nigel Schofield, Senior Lecturer, School of Electrical and Electronic Engineering, University of Manchester.