Difference Between Line Interactive UPS and Online UPS

Difference Between Line Interactive UPS and Online UPS

1. Operating Principle
Line Interactive UPS

• Detects abnormal voltage and uses an Automatic Voltage Regulator (AVR) to stabilize it
  
• Switches to battery power if the voltage is outside the AVR adjustment range
  
• Suitable for areas with moderate power disturbances

Online UPS

• Uses Double Conversion Technology (AC to DC to AC)
• Delivers clean and stable power, fully isolated from input disturbances
  
• Ideal for sensitive equipment that requires uninterrupted, high-quality power

2. Output Power Quality (Sine Wave Type)

Line Interactive UPS:

• Provides a simulated sine wave
• Acceptable for standard office devices and general computers
  
• Some advanced models offer a near-pure sine wave

Online UPS:

• Outputs a true sine wave
• Recommended for telecom, medical, and precision equipment

3. Voltage Regulation

Line Interactive UPS:

• Uses AVR to maintain voltage within safe range without using the battery
  
• Switches to battery only when voltage exceeds AVRs handling capability

Online UPS:

• Constantly regulates voltage through double conversion
  
• No need for battery switching or AVR

4. Transfer Time

Line Interactive UPS:

• Has a small delay (210 ms) when switching to battery during an outage
• Not ideal for equipment requiring zero interruption

• Zero transfer time
• Continuous power delivery through inverter at all times

• Recommended for:
  • Office computers
    
  • Small network devices
    
  • Small businesses in areas with occasional power issues
    
• Advantages:
  • More affordable
    
  • AVR function extends battery lifespan

Online UPS:

• Recommended for:
  • Servers
    
  • Medical devices
    
  • Telecommunication systems
    
  • Environments requiring continuous, high-quality power
• Advantages:
  • Delivers the highest power quality
    
  • Protects against all types of electrical disturbances

6. Cost Comparison

Line Interactive UPS:

• Budget-friendly for general usage

Online UPS:

• Higher cost but justifiable for protecting mission-critical equipment

Conclusion

Line Interactive UPS is suitable for general office use where power conditions are fairly stable. Online UPS is the preferred choice for environments with frequent power issues or sensitive equipment requiring high power quality.

BT Connect offers consultation and support to help you select the best UPS for your application.