• In Stock
Brands
Show More
VA Rating
Watts
Outlets
Show More
Battery Run Time
Interface Port
Show More
Rackmountable
Battery Type
All Top Brands
Availability
Useful Links
Customer Ratings
Sort By:
View:
Eaton 5S1500LCD 5S UPS 1500VA 900 Watt 120V LCD Line-Interactive Battery Backup ECO USB - Tower - 2 Minute Stand-by - 110 V AC Input - 115 V AC Output - 10 x NEMA 5-15R
Quick View
Eaton 5S1500LCD 5S UPS 1500VA 900 Watt 120V LCD Line-Interactive Battery Backup ECO USB - Tower - 2 Minute Stand-by - 110 V AC Input - 115 V AC Output - 10 x NEMA 5-15R
  • Outlets: 10
  • Battery Run Time: Backup/Run Time (Half Load) 12 Minute Backup/Run Time (Full Load) 2 Minute
  • Brand: EATON
  • International Version: 120V
  • Model #: 5S1500LCD
  •  
  • ¥60,548 
  • ¥65,978 Shipping
Tripp Lite OMNI1500LCDT Series OmniSmart 1500VA 810W 120V Line-Interactive UPS - 10 Outlets, AVR, USB, LCD, Tower - 1500 VA/810 W - 120 V ACTower - 10 x NEMA 5-15R
Quick View
Tripp Lite OMNI1500LCDT Series OmniSmart 1500VA 810W 120V Line-Interactive UPS - 10 Outlets, AVR, USB, LCD, Tower - 1500 VA/810 W - 120 V ACTower - 10 x NEMA 5-15R
  • Outlets: 10
  • Battery Run Time: Half load (minutes): 7.5 (405 watts)
  • Output Frequency: 50 / 60 Hz
  • Battery Recharge Time: Less than 8 hours from 10% to 90%
  • Model #: OMNI1500LCDT
APC BR1500MS2 Back-UPS Pro 1500VA/900W, Tower, 120V, 10x NEMA 5-15R outlets, AVR, USB Type A + C ports, LCD, User Replaceable Battery -Tower - AVR - 16 Hour Recharge -4.10 Minute Stand-by -120 V Input
Quick View
APC BR1500MS2 Back-UPS Pro 1500VA/900W, Tower, 120V, 10x NEMA 5-15R outlets, AVR, USB Type A + C ports, LCD, User Replaceable Battery -Tower - AVR - 16 Hour Recharge -4.10 Minute Stand-by -120 V Input
  • Outlets: 10
  • Battery Run Time: Backup/Run Time (Half Load) 14.50 Minute Backup/Run Time (Full Load) 4.10 Minute
  • Output Frequency: 60 Hz +/- 3 Hz
  • Battery Recharge Time: 16 hour(s)
  • Model #: BR1500MS2
APC BX1350M Back-UPS Pro 1350 VA 810 Watts 10 Outlets Uninterruptible Power Supply (UPS)
Quick View
APC BX1350M Back-UPS Pro 1350 VA 810 Watts 10 Outlets Uninterruptible Power Supply (UPS)
  • Outlets: 10
  • Battery Run Time: At full load: 2.5 minutes At half load: 10.1 minutes
  • Output Frequency: 60 Hz
  • Battery Recharge Time: 16 Hour(s)
  • Model #: BX1350M
  •  
  • ¥58,583 
  • ¥61,496 Shipping
APC SMC1000C 1000 VA 600 Watts 8 Outlets Pure Sinewave Smart-UPS with SmartConnect (Replaces SMC1000)
Quick View
APC SMC1000C 1000 VA 600 Watts 8 Outlets Pure Sinewave Smart-UPS with SmartConnect (Replaces SMC1000)
  • Outlets: 8
  • Battery Run Time: Full load: 9.2 Minutes Half load: 22.5 Minutes
  • Output Frequency: 47 - 63 Hz
  • Battery Recharge Time: 3 Hour(s)
  • Model #: SMC1000C
CyberPower CP1350PFCLCD PFC Sinewave UPS Systems - 1350VA/880W, 120 VAC, NEMA 5-15P, Mini-Tower, Sine Wave, 12 Outlets, LCD, PowerPanel
Quick View
CyberPower CP1350PFCLCD PFC Sinewave UPS Systems - 1350VA/880W, 120 VAC, NEMA 5-15P, Mini-Tower, Sine Wave, 12 Outlets, LCD, PowerPanel
  • Outlets: 10
  • Battery Run Time: Half Load: 9 Minutes Full Load: 3 Minutes
  • Output Frequency: 60 Hz +/- 1%
  • Battery Recharge Time: 8 Hour(s)
  • Model #: CP1350PFCLCD
Tripp Lite SMART1500LCD Series Smart LCD 1500VA 900W 120V Line-Interactive UPS - 8 Outlets, USB, DB9, 2U Rack/Tower - 2U Rack/Tower - 8 Hour Recharge - 3.50 Minute Stand-by - 110 V AC Input
Quick View
Tripp Lite SMART1500LCD Series Smart LCD 1500VA 900W 120V Line-Interactive UPS - 8 Outlets, USB, DB9, 2U Rack/Tower - 2U Rack/Tower - 8 Hour Recharge - 3.50 Minute Stand-by - 110 V AC Input
  • Outlets: 8
  • Battery Run Time: Full load runtime: 4.4 minutes (900 Watts) Half load runtime: 11.8 minutes (450 Watts)
  • Output Frequency: 60 Hz
  • Battery Recharge Time: Less than 4.5 hours from 10% to 90%
  • Model #: SMART1500LCD
CyberPower CPS1500AVR Smart App LCD UPS Systems - 1500VA/900W, 120 VAC, NEMA 5-15P, Rack / Tower, 8 Outlets, PowerPanel
Quick View
CyberPower CPS1500AVR Smart App LCD UPS Systems - 1500VA/900W, 120 VAC, NEMA 5-15P, Rack / Tower, 8 Outlets, PowerPanel
  • Outlets: 6 x 5-15R Battery/Surge Protected
  • Battery Run Time: 6 Minutes at Full-load 18 Minutes at Half-load Performance PC with 19" LCD (500W) - 16 min.
  • Battery Recharge Time: 8 Hours
  • Series: Rackmount
  • Model #: CPS1500AVR
  •  
  • ¥129,908 
  • ¥144,194 Shipping
CyberPower CP685AVRG AVR UPS Systems - 685VA/390W, 120 VAC, NEMA 5-15P, Compact, 8 Outlets, PowerPanel® Personal
Quick View
CyberPower CP685AVRG AVR UPS Systems - 685VA/390W, 120 VAC, NEMA 5-15P, Compact, 8 Outlets, PowerPanel® Personal
  • Outlets: 8
  • Battery Run Time: At Full Load: 11 Minutes At Half Load: 2 Minutes
  • Output Frequency: 60 Hz +/- 1%
  • Battery Recharge Time: 8 Hour(s)
  • Model #: CP685AVRG
  •  
  • ¥25,484 
  • ¥32,902 Shipping
Eaton 5SC1500 5SC UPS 1500 VA 1080 Watt 120V Line-Interactive Battery Backup Tower USB - Tower - 5 Minute Stand-by - 110 V AC Input - 8 x NEMA 5-15R -
Quick View
Eaton 5SC1500 5SC UPS 1500 VA 1080 Watt 120V Line-Interactive Battery Backup Tower USB - Tower - 5 Minute Stand-by - 110 V AC Input - 8 x NEMA 5-15R -
  • Outlets: 8
  • Battery Run Time: Run Time at Half Load: 13 mins Run Time at Full Load: 5 mins
  • International Version: 120V
  • Input Voltage Range: 96 - 144 Vac
  • Model #: 5SC1500
CyberPower OR2200LCDRT2U Smart App LCD UPS Systems - 2000VA/1320W, 120 VAC, NEMA 5-20P, 2U, Rack / Tower, 8 Outlets, LCD, PowerPanel
Quick View
CyberPower OR2200LCDRT2U Smart App LCD UPS Systems - 2000VA/1320W, 120 VAC, NEMA 5-20P, 2U, Rack / Tower, 8 Outlets, LCD, PowerPanel
  • Outlets: 8
  • Battery Run Time: Runtime at Half Load (min): 13 Runtime at Full Load (min): 5
  • Output Frequency: 50/60Hz +/- 1%
  • Battery Recharge Time: 8 Hour(s)
  • Model #: OR2200LCDRT2U
APC BR1500G  Back-UPS Pro, 1500VA/865W, Tower, 120V, 10x NEMA 5-15R outlets, AVR, LCD, User Replaceable Battery - Tower - 8 Hour Recharge - 3 Minute Stand-by - 120 V Input - 120 V AC Output
Quick View
APC BR1500G Back-UPS Pro, 1500VA/865W, Tower, 120V, 10x NEMA 5-15R outlets, AVR, LCD, User Replaceable Battery - Tower - 8 Hour Recharge - 3 Minute Stand-by - 120 V Input - 120 V AC Output
  • Outlets: 10
  • Battery Run Time: Run Time at Full Load: 3.8 minutes Run Time at Half load: 12.8 minutes
  • Output Frequency: 50/60 Hz +/- 3 Hz sync to mains
  • Battery Recharge Time: 8 Hours
  • Model #: BR1500G
CyberPower OR1000PFCLCD 1000 VA 700 Watts UPS
Quick View
CyberPower OR1000PFCLCD 1000 VA 700 Watts UPS
  • Outlets: 8
  • Battery Run Time: At Half Load (min): 17.5 At Full Load (min): 9.5
  • Output Frequency: 50/60 Hz +/- 1%
  • Battery Recharge Time: 8 Hour(s)
  • Model #: OR1000PFCLCD
CyberPower CP850PFCLCD PFC Sinewave UPS Systems - 850VA/510W, 120 VAC, NEMA 5-15P, Mini-Tower, Sine Wave, 10 Outlets, LCD, PowerPanel
Quick View
CyberPower CP850PFCLCD PFC Sinewave UPS Systems - 850VA/510W, 120 VAC, NEMA 5-15P, Mini-Tower, Sine Wave, 10 Outlets, LCD, PowerPanel
  • Outlets: 10
  • Battery Run Time: Half Load: 11 minutes Full Load: 2 minutes
  • Output Frequency: 60 Hz +/- 1%
  • Battery Recharge Time: 8 Hour(s)
  • Model #: CP850PFCLCD
CyberPower SL950U Standby UPS System, 950VA/510W, 8 Outlets, USB Charge Ports
Quick View
CyberPower SL950U Standby UPS System, 950VA/510W, 8 Outlets, USB Charge Ports
  • Outlets: 8
  • Battery Run Time: 1 min Runtime at Full Load / 8 min Runtime at Half Load
  • Output Frequency: 50/60 Hz +/- 1% (auto-sensing)
  • Battery Recharge Time: 8 Hours
  • Model #: SL950U
  •  
  • ¥20,381 
  • ¥9,353 Shipping
CyberPower CP550SLG Standby UPS Systems - 550VA/330W, 120 VAC, NEMA 5-15P, Compact, 8 Outlets,  890 Joules Surge Energy Rating PowerPanel
Quick View
CyberPower CP550SLG Standby UPS Systems - 550VA/330W, 120 VAC, NEMA 5-15P, Compact, 8 Outlets, 890 Joules Surge Energy Rating PowerPanel
  • Outlets: 8
  • Battery Run Time: Runtime at Half Load: 8 minutes Runtime at Full Load: 2 minutes
  • Output Frequency: 50/60 Hz +/- 1%
  • Battery Recharge Time: 8 Hours
  • Model #: CP550SLG
CyberPower CP1200AVR AVR UPS Systems - 1200VA/720W, 120 VAC, NEMA 5-15P, Mini-Tower, 10 Outlets, PowerPanel
Quick View
CyberPower CP1200AVR AVR UPS Systems - 1200VA/720W, 120 VAC, NEMA 5-15P, Mini-Tower, 10 Outlets, PowerPanel
  • Outlets: 8
  • Battery Run Time: Runtime at Half Load: 12 min Runtime at Full Load: 3 min
  • Battery Recharge Time: 8 Hour(s)
  • Series: AVR
  • Model #: CP1200AVR
CyberPower ST900U Standby UPS Systems - 900VA/500W, 120 VAC, NEMA 5-15P, Compact, 12 Outlets, PowerPanel® Personal
Quick View
CyberPower ST900U Standby UPS Systems - 900VA/500W, 120 VAC, NEMA 5-15P, Compact, 12 Outlets, PowerPanel® Personal
  • Outlets: 12
  • Battery Run Time: At Half Load: 7.5 Minutes At Full Load: 2 Minutes
  • Output Frequency: 50 Hz / 60 Hz +/- 1%
  • Battery Recharge Time: 8 hour(s)
  • Model #: ST900U
CyberPower BRG1000AVRLCD Intelligent LCD UPS Systems - 1000VA/600W, 120 VAC, NEMA 5-15P, Mini-Tower, 10 Outlets, LCD, PowerPanel
Quick View
CyberPower BRG1000AVRLCD Intelligent LCD UPS Systems - 1000VA/600W, 120 VAC, NEMA 5-15P, Mini-Tower, 10 Outlets, LCD, PowerPanel
  • Outlets: 10
  • Battery Run Time: At Half Load: 9 minutes At Full Load: 1 minute
  • Output Frequency: 60 Hz +/- 1%
  • Battery Recharge Time: 8 Hour(s)
  • Model #: BRG1000AVRLCD
APC UPS, 3000 VA Smart-UPS Sine Wave UPS Battery Backup with Extended Run Option, Network Management Card, 2U Rackmount/Tower Convertible, Line-Interactive, 120V (SMX3000RMLV2UNC)
Quick View
  •  
  • ¥714,969 
  • ¥205,937 Shipping
Tripp Lite SMART500RT1U Series 500VA 300W 120V Line-Interactive UPS -6 NEMA 5-15R Outlets, USB, DB9, Network Card Option, 1U Rack/Tower - 1U Rack/Tower - 4 Hour Recharge -3.20 Minute Stand-by-120V AC
Quick View
Tripp Lite SMART500RT1U Series 500VA 300W 120V Line-Interactive UPS -6 NEMA 5-15R Outlets, USB, DB9, Network Card Option, 1U Rack/Tower - 1U Rack/Tower - 4 Hour Recharge -3.20 Minute Stand-by-120V AC
  • Outlets: 6
  • Battery Run Time: Full Load Runtime (min.): 3 min. (300w) Half Load Runtime (min.): 14 min. (150w)
  • Output Frequency: 60 Hz
  • Battery Recharge Time: Less than 12 hours to 90%
  • Model #: SMART500RT1U
CyberPower OR700LCDRM1U Smart App LCD UPS Systems - 700VA/400W, 120 VAC, NEMA 5-15P, 1U, Rackmount, 6 Outlets, LCD, PowerPanel
Quick View
CyberPower OR700LCDRM1U Smart App LCD UPS Systems - 700VA/400W, 120 VAC, NEMA 5-15P, 1U, Rackmount, 6 Outlets, LCD, PowerPanel
  • Outlets: 6
  • Battery Run Time: At Full Load: 3 min At Half Load: 11 min
  • Output Frequency: 60 Hz +/- 1%
  • Battery Recharge Time: 8 Hours
  • Model #: OR700LCDRM1U
APC SMT750RM2UC 750 VA 500 Watts 120V 6 Outlets Pure Sinewave Smart-UPS with SmartConnect (Replaces SMT750RM2U)
Quick View
APC SMT750RM2UC 750 VA 500 Watts 120V 6 Outlets Pure Sinewave Smart-UPS with SmartConnect (Replaces SMT750RM2U)
  • Outlets: 6
  • Battery Run Time: At Full Load: 5.5 Minutes At Half Load: 16 Minutes
  • Output Frequency: 50/60 Hz +/- 3 Hz
  • Battery Recharge Time: 3 Hour(s)
  • Model #: SMT750RM2UC
APC SMC1500-2UC 1440 VA 900 Watts 6 Outlets Pure Sinewave Smart-UPS with SmartConnect (Replaces SMC1500-2U)
Quick View
APC SMC1500-2UC 1440 VA 900 Watts 6 Outlets Pure Sinewave Smart-UPS with SmartConnect (Replaces SMC1500-2U)
  • Outlets: 6
  • Battery Run Time: At Half load: 18 Minutes At Full load: 6 Minutes
  • Output Frequency: 47 - 63 Hz
  • International Version: 120V
  • Model #: SMC1500-2UC
Eaton 5S1000LCD  5S UPS 1000VA 600 Watt 120V LCD Line-Interactive Battery Backup ECO USB - Tower - 3 Minute Stand-by - 110 V AC Input - 115 V AC Output - 10 x NEMA 5-15R
Quick View
Eaton 5S1000LCD 5S UPS 1000VA 600 Watt 120V LCD Line-Interactive Battery Backup ECO USB - Tower - 3 Minute Stand-by - 110 V AC Input - 115 V AC Output - 10 x NEMA 5-15R
  • Outlets: 10
  • Battery Run Time: Run Time at Full Load: 3 mins Run Time at Half Load: 14 mins
  • International Version: 120V
  • Input Voltage Range: 93 - 138V
  • Model #: 5S1000LCD
  •  
  • ¥51,078 
  • ¥56,012 Shipping
CyberPower OR1500LCDRM1U Smart App LCD UPS Systems - 1500VA/900W, 120 VAC, NEMA 5-15P, 1U, Rackmount, 6 Outlets, LCD, PowerPanel
Quick View
CyberPower OR1500LCDRM1U Smart App LCD UPS Systems - 1500VA/900W, 120 VAC, NEMA 5-15P, 1U, Rackmount, 6 Outlets, LCD, PowerPanel
  • Outlets: 4 x 5-15R Battery & Surge 2 x 5-15R Surge-Only
  • Battery Run Time: Runtime at Half Load: 11 minutes Runtime at Full Load: 2 minutes
  • Output Frequency: 60 Hz +/- 1%
  • Battery Recharge Time: 8 Hour(s)
  • Model #: OR1500LCDRM1U
CyberPower CP685AVRLCD Intelligent LCD UPS Systems - 685VA/390W, 120 VAC, NEMA 5-15P, Compact, 8 Outlets, LCD, PowerPanel Personal
Quick View
CyberPower CP685AVRLCD Intelligent LCD UPS Systems - 685VA/390W, 120 VAC, NEMA 5-15P, Compact, 8 Outlets, LCD, PowerPanel Personal
  • Outlets: 8
  • Battery Run Time: 10 min at Half Load 2 min at Full Load
  • Input Voltage Range: 90 - 140V
  • Input Frequency: 60 Hz +/- 3 Hz
  • Model #: CP685AVRLCD
CyberPower Smart App Online OL3000RTXL2U 3000VA 100-125V Pure Sine Wave LCD Rack/Tower UPS
Quick View
CyberPower Smart App Online OL3000RTXL2U 3000VA 100-125V Pure Sine Wave LCD Rack/Tower UPS
  • Outlets: 7
  • Battery Run Time: 11 Minutes (Runtime at Half Load) 3.5 Minutes (Runtime at Full Load)
  • Output Frequency: 50 / 60Hz (Auto-Sensing or Configurable) +/- 0.25Hz
  • Battery Recharge Time: 4 Hours
  • Model #: OL3000RTXL2U
  •  
  • ¥472,063 
  • ¥180,144 Shipping
APC SMT1000C Smart-UPS, Line Interactive, 1000VA, Tower, 120V, 8x NEMA 5-15R outlets, SmartConnect Port+SmartSlot, AVR, LCD
Quick View
APC SMT1000C Smart-UPS, Line Interactive, 1000VA, Tower, 120V, 8x NEMA 5-15R outlets, SmartConnect Port+SmartSlot, AVR, LCD
  • Outlets: 8
  • Battery Run Time: At Full load: 6 Minutes
  • Output Frequency: 47 - 53 Hz
  • International Version: 120V
  • Model #: SMT1000C
CyberPower EC750G Ecologic UPS Systems - 750VA/450W, 120 VAC, NEMA 5-15P, Compact, 12 Outlets, PowerPanel® Personal
Quick View
CyberPower EC750G Ecologic UPS Systems - 750VA/450W, 120 VAC, NEMA 5-15P, Compact, 12 Outlets, PowerPanel® Personal
  • Outlets: 12
  • Battery Run Time: At half load: 8 minutes At full load: 1 minute
  • Output Frequency: 50 / 60 Hz +/- 1% (auto-sensing)
  • Battery Recharge Time: 8 Hour(s)
  • Model #: EC750G
APC SMX1500RM2UC Smart-UPS X, Line Interactive, 1500VA, Rack/tower convertible 2U, 120V, 8x 5-15R NEMA, SmartConnect port, Extended runtime
Quick View
APC SMX1500RM2UC Smart-UPS X, Line Interactive, 1500VA, Rack/tower convertible 2U, 120V, 8x 5-15R NEMA, SmartConnect port, Extended runtime
  • Outlets: 8
  • Battery Run Time: Full load: 5 min
  • Output Frequency: 50/60 Hz +/- 3 Hz Sync to mains
  • Battery Recharge Time: 3 hour(s)
  • Model #: SMX1500RM2UC
CyberPower AVRG750U 750 VA 450 Watts 12 Outlets Compact UPS w/ Automatic Voltage Regulation
Quick View
CyberPower AVRG750U 750 VA 450 Watts 12 Outlets Compact UPS w/ Automatic Voltage Regulation
  • Outlets: 12
  • Battery Run Time: Half Load: 7.6 minutes Full Load: 2.5 minutes
  • Output Frequency: 60Hz +/- 1%
  • Battery Recharge Time: 8 Hour(s)
  • Model #: AVRG750U
APC SMX3000RMLV2U UPS, 3000 VA Smart-UPS Sine Wave UPS Battery Backup with Extended Run Option, 2U Rackmount/Tower Convertible, Line-Interactive, 120V
Quick View
APC SMX3000RMLV2U UPS, 3000 VA Smart-UPS Sine Wave UPS Battery Backup with Extended Run Option, 2U Rackmount/Tower Convertible, Line-Interactive, 120V
  • Outlets: 7
  • Output Frequency: 50/60Hz +/- 3 Hz
  • Battery Recharge Time: 3 Hours
  • International Version: 120V
  • Model #: SMX3000RMLV2U
CyberPower EC650LCD Ecologic UPS Systems - 650VA/390W, 120 VAC, NEMA 5-15P, Compact, 8 Outlets, LCD, PowerPanel® Personal
Quick View
CyberPower EC650LCD Ecologic UPS Systems - 650VA/390W, 120 VAC, NEMA 5-15P, Compact, 8 Outlets, LCD, PowerPanel® Personal
  • Outlets: 8
  • Battery Run Time: At Half Load: 8 minutes At Full Load: 2 minutes
  • Output Frequency: 50/60 Hz +/- 1% (auto-sensing)
  • Battery Recharge Time: 8 Hour(s)
  • Model #: EC650LCD

An uninterruptible power supply, or UPS system, ensures that electricity continuously reaches crucial equipment, powering it at all times. Even if other devices lose power during outages or brownouts, servers and computers continue to run. Users then have time to safely shut down their machinery to prevent the loss of data. A UPS system also is essential for keeping important systems such as security cameras and health care equipment running for as long as possible.

A UPS System Protects Against Surges

The outlets on a UPS system provide similar defenses to those offered by surge protectors, absorbing the excess energy of surges and spikes. Receiving a jolt of too much power may damage sensitive computer components such as hard drives. A desktop UPS or a larger model likely has multiple devices plugged in and keeps them safe from such events that are especially prevalent after outages, just as power is restored. The initial spike may be detrimental to devices plugged into a standard outlet, so a surge-protected outlet is helpful. Some UPS models feature surge-only outlets, which supply power and protection without draining the UPS battery.

Saving Energy with a UPS System

Many UPS system types have a "green" or "eco" mode that increases energy efficiency and reduces utility costs. Energy-focused systems offer extra savings measures such as switching off during non-business hours or detecting and bypassing unused equipment. A UPS system usually also has a single switch or circuit breaker similar to the kind many power strips have. Operators can power down multiple devices with just the press of a button, making reboots and power-cycles quicker, easier and safer.

Protection for Multiple Types of Equipment

A single-user UPS system is small enough to fit beneath a desk while still supplying protection for a computer, monitor and printer. Specialized UPS models meet the unique needs of environments such as hospitals and marine vessels. When installing in a server room alongside equipment such as servers and a power distribution unit, consider a rack-mountable UPS to economize on space. A UPS typically has not only electrical outlets but also network, USB and serial ports for protecting against noise as well as surges. Some devices use transformer block plugs, requiring outlets spaced farther apart.

Suitable for Small and Large Businesses

Businesses of all sizes use servers and switches, for which a pure sinewave UPS is an optimal solution. These closely simulate the type of power you expect from standard utilities for consistent, reliable performance. There are also single-phase UPS systems for smaller set-ups and three-phase units for powering multiple devices with varying power requirements. Line-interactive units manage voltage changes without utilizing battery power unless necessary, so it has a strong charge and is ready to handle an outage. An online UPS system, on the other hand, converts incoming power using the battery to maintain consistency. This creates a layer of insulation between the equipment and external line issues.