CyberPower ST900U Standby Series UPS System StandBy Series

CyberPower ST900U Standby Series UPS System

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The CyberPower ST900U uninterruptible power supply (UPS) safeguards a home office PC and other electronics (modem, wireless router, gaming console, and cablebox/DVR) from surges, spikes, sags, brownouts and other power abnormalities. Two USB charging ports keep phones and tablets operating during a power outage, and PowerPanel Personal management software makes it easy to control and monitor your UPS.

A Three-Year Warranty ensures that this UPS has passed our highest quality standards in design, assembly, material or workmanship and further protection is offered by a $125,000 Connected Equipment Guarantee.


  • Desktop Computers
  • Personal Electronics


  • 900 VA/500 W
  • 12 Standard Outlets
  • Standby Topology
  • Full-time Surge Protection and Battery Backup
  • Three-Year Warranty
Battery Quantity 1
Battery Size 12V / 7.2AH
Battery Type Sealed Lead-Acid
Hot Swappable No
Replacement Battery Cartridge TBD
Runtime At Full Load 2 min
Runtime At Half Load 7.5 min
Typical Recharge Time 8 hours
User Replaceable Field replacement
Safety UL1778, cUL, FCC DOC Class B, CEC
Weight (kg) 3.49
Weight (lb) 7.7
Energy Saving GreenPower UPS High Efficiency
Energy Star Certified Yes
UPS Topology Standby
Circuit Breaker 15 A
Cord Length (ft) 5
Frequency Range 47
Input Voltage Range 96Vac
Plug Type NEMA 5-15P
Management & Communications
Audible Alarms On battery, low battery, overload, fault
HID Compliant USB Port Yes
Led Indicators Power On
Multifunction LCD Panel No
Serial Port No
Software PowerPanel Personal Edition
On Battery Frequency 50Hz/60Hz
On Battery Voltage 120Vac
On Battery Waveform Simulated sine wave
Outlet Type NEMA 5-15R
Overload Protection Internal circuitry limiting / circuit breaker
Rated Power Factor 0.56
Transfer Time Typical 8ms
USB Charge Ports 2 (2.1 Amps Shared)
VA 900
Watts 500
Color Black
Environmental RoHS Compliant
Form Factor Compact
Keyhole Mounting Slots Yes
Maximum Operating Elevation 10,000 ft (3,000 m)
Maximum Storage Elevation 50,000 ft (15,000 m)
Operating Relative Humidity 0
Operating Temperature 32
Storage Temperature 5
Weight (lbs) 7.7
Surge Protection & Filtering
EMI/RFI Filtration Yes
Surge Suppression 890
CEG Amount 125000
Connected Equipment Guarantee Lifetime
Product Warranty 3 Years Limited