Selecting the Correct UPS for your Application

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Line Interactive or Online Double Conversion?

For small single phase UPS applications, line interactive UPSs have historically been the standard. However, as servers move off-site, applications go to the cloud, and network connectivity becomes more critical, we’re seeing an increase in online double conversion UPS installations to support networking switches and routers. There are some key differences between these two topologies that users should be aware of when selecting a UPS for networking equipment.

  1. Internal Bypass and Dropping the load – perhaps the most important difference between line interactive and online double conversion is the internal bypass found in online double conversion UPSs. The bypass allows the UPS to automatically switch to utility or generator power in the event of a battery or other UPS failure. Line interactive UPSs do not have an internal bypass, which means that when the battery dies or if the UPS experiences a failure, the UPS will drop the load.
  2. Power Conditioning and Voltage Regulation – Line interactive UPSs use transformers to normalize voltage spikes and sags which may result in a voltage range of 8%-30% for the power going to the IT load. With online double conversion, the voltage range of the power to the load is much smaller – 1%-3% because the UPS conditions the power by converting it from AC to DC and back to “clean” AC before sending power to IT equipment.
  3. Battery life – particularly in geographic areas where the utility grid can be unstable or unreliable, line interactive UPSs can drain their batteries faster than online double conversion. When a line interactive UPS detects an unusually high surge or sag that may not be managed by the transformers, it will go to battery power so it can provide clean power to the load. This may result in the UPS going to battery more frequently, which means more battery discharges and subsequent charges and a potentially shortened battery life.
  4. Pricebecause of their more sophisticated topology, online double conversion UPSs are more expensive than line interactive UPSs. Depending on the power rating, online double conversion can be 20% – 30% more expensive. However, given the added reliability of the static bypass, most users find the added peace of mind to be well worth the extra cost.

Customers using single phase UPS equipment in the 700VA – 3kVA range to support critical servers, networking equipment, or storage devices are encouraged to consider upgrading to online double conversion UPSs.
Please continue reading for more information about online double conversion Single-Phase UPSs from the top manufacturers. For detailed specifications and configuration assistance, call me 800-876-9373.


Molly Lacerte
Power Solutions, LLC
800-876-9373 ext. 711
[email protected]

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700VA – 3000VA Advanced Power Protection for IT and Network Environments

  • Eaton 9130Protects against downtime, data loss and process interruption by providing continuous, clean power
  • Graphical user interface provides all critical UPS information on a single screen and enables settings control at the push of a button
  • Provides up to 3000 VA in only 2U of rack space
  • Offers premium performance with a 0.9 power factor and >95 percent efficiency in high efficiency mode
  • Increases battery service life and system uptime with ABM® battery charging technology
  • Enables prolonged runtime of essential equipment during power outages by allowing for orderly, remote shutdown of non-critical systems or processes
  • Ensures data and system integrity with Intelligent Power® Manager supervisory software, which provides easy, versatile, remote monitoring and management of multiple devices

For more information about The Eaton 9130 UPS, visit our website, call 800-876-9373.


500VA – 3000VA Online UPS Provides Continuous, High-Quality Power Protection

  • Liebert-GXTg3000 UPSOn-line design means zero transfer time from external to internal power. When utility power fails, your critical load remains supported by a seamless flow of power.
  • Liebert GXT3 rated output power factor of 0.9 better matches up with switch-mode power supplies used in today’s IT equipment.
  • A higher output power factor allows for a more efficient utilization of the UPS.
  • For maximum control, Liebert GXT3 is custom configurable to your needs using a specially designed Windows software package.
  • ENERGY STAR® qualified models available.
  • Trade Compliance: Public sector customers may select from four capacities (1000,1500, 2000 and 3000 VA, 120V) to provide TAA compliance.Refer to Liebert GXT3-GVG3 models.

For more information about The Liebert GXT3 UPS, visit our website, call 800-876-9373.


700VA – 2000VA Secure, conditioned power for critical loads

VH series UPS UL Listed 700VA-2kVA Unique fail-safe internal bypass – Continued operation even with overload or over-temperature
• 2U design for all ratings – Small footprint; parts supplied for tower or rack assembly
• Matching battery cabinets – Longer battery life available with the addition of extra battery cabinet(s)
• Superior battery management – Provides protection to the battery and extends the battery life
• Remote monitoring – Easy access and control even for unmanned or isolated sites
• Mean Time Before Failure >730,000 hours – Proven reliability
• Increased power handling – 0.9 output power factor delivers more actual power to the load
For more information about The GE Critical Power VH Series, visit our website, call 800-876-9373.


1500VA – 3000VA High-Density UPS with scalable runtime

  • APC SMART-UPS ONLINE RACK_TOWER UPSDouble Conversion Online – Provides tight voltage and frequency regulation and zero transfer time for reactive loads (machinery, lab equipment, etc.)
  • Advanced 16-Segment LED Display – Quickly understand unit and power status with visual indicators. (LCD on 15-20 kVA models)
  • Frequency and Voltage Regulation – Gives higher application availability by correcting poor frequency and voltage conditions without using the battery
  • UPS Network Management Card with Environmental Monitoring – Provides remote user interface, manage via web browser or SNMP. Includes graceful unattended shutdown
  • Scalable Runtime – Allows additional run time to be quickly added as needed.
  • Built-in Automatic and Manual Bypass – Ensures seamless power to the load even in the event of catastrophic UPS failure.
  • Field-replaceable Power Distribution Panels – Enable quick in-field modification of output receptacles to fit changing needs.

For more information about APC Smart-UPS Online, visit our website, call 800-876-9373.