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UPS Technology

Types of UPS

The vast majority of UPS in use today store their energy in sealed valve-regulated lead-acid batteries (SVRLAs).

Two UPS technologies dominate, ‘on-line’ and ‘off-line’. Almost all units described by their manufacturers as being ‘line interactive’ are off-line units but with the addition of an Automatic Voltage Regulation (AVR) transformer.

The description ‘on-line / off-line’ simply indicates whether the inverter (that part of the UPS that converts the DC provided by the batteries to the AC that we use from a wall socket) is on-line or off-line during normal use. Almost all UPS rated at 10kVA and over are on-line.

To understand the power quality issues that UPS are designed to resolve, and for help in selecting the most appropriate UPS technology, why not view Understanding Standby Power. Generally, the following distinctions apply:

Off-line UPS
  • Lower cost than other units
  • Under mains power unit charges batteries and power passes directly to the load
  • During mains failure batteries provide power to DC/AC inverter to provide 230VAC power to the load
  • Square-wave or Sine-wave output

 

On-line UPS
  • Constant duty inverter
  • Design inherently improves power quality and reliability
  • No break
  • Sine-wave output
  • Static bypass improves reliability

 

Line Interactive UPS


These UPS offer enhanced power protection over the basic off-line designs because they provide additional line conditioning. They can also cope with a wider range of input voltages without resorting to battery.

High Capacity off-line UPS for Data Centres

With an understanding of the need for power saving within Data Centres, and having tracked the latest developments in off-line UPS technology, UPS Systems have now become the sole UK distributor of PureWave UPS products from S&C Electric in Canada.

PureWave is a high-capacity, off-line, immediate-discharge UPS that provides power protection to entire facilities served by a single source. Its modular structure supports Data Centre loads between 313kVA and 20MVA, protecting the power sensitive equipment from voltage sags, surges, transients, momentary disruptions and complete outages.

For immediate assistance  with all your standby power requirements, please contact us via telephone or via our online contact form or let us call you back .

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