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Rectangular black UPS unit with twelve NEMA 5-15R outlets and USB port

CyberPower

CyberPower ST900U UPS 900VA 500W 120V 12 Outlets

SKU CH-X2MH-2CXM8 MPN ST900U

Standby UPS delivers 900 VA and 500 W backup with 12 outlets, USB management and 890-joule surge protection

  • AC input voltage96 V AC - 140 V AC
  • Input line frequency47–63 Hz
  • Power inputNEMA 5-15P
  • Volt-ampere rating900 VA
  • Power rating500 W
  • Voltage output120 V AC

VA 900 VA

  • 900 VA / 500 W capacity keeps essential electronics running during outages
  • 12 NEMA 5-15R outlets provide surge protection and battery backup for multiple devices
  • Simulated sine wave output delivers cost-effective backup power for compatible equipment
  • USB port with PowerPanel Personal software enables automated shutdown and power monitoring
  • 890 joules surge energy rating shields connected gear from damaging voltage spikes

Compact standby UPS for desktop protection

The CyberPower ST900U is a standby uninterruptible power supply rated at 900 VA and 500 W. It delivers simulated sine wave output at 120 V AC to keep a workstation, router and monitor running during a blackout. The unit suits home-office users who need basic battery backup and surge protection for essential electronics.

Twelve NEMA 5-15R outlets with USB charging

Six outlets provide battery backup plus surge protection while six additional outlets supply surge-only protection. A NEMA 5-15P plug on a five-foot cord connects to a standard wall socket. Two USB Type-A ports share a 2.1 A output for charging phones or tablets. Audible alarms signal on-battery, low-battery, overload and fault conditions.

Verify load and runtime needs before ordering

The UPS supports a maximum of 500 W; add the wattage of every device you plan to plug into the battery-backed outlets to stay within that limit. At half load the battery lasts 7.5 minutes and at full load only 2 minutes, so the unit is intended for safe shutdown rather than extended operation. Recharge takes eight hours after a discharge.

Software and USB management included

PowerPanel Personal software connects via the USB port to enable automatic file saving and graceful shutdown during extended outages. The unit meets UL 1778, cUL, FCC Class B, CEC and RoHS standards. Surge energy rating is 890 joules. Input voltage range spans 96 V to 140 V AC at 47 to 63 Hz.

How it compares

Measured against everything we stock in Uninterruptible Power Supplies (UPS), at today’s prices. Recalculated every night.

Price $88.99
Cheaper than about 92% of the 1,153 comparable items (median $948.99).

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Specifications

Product
Brand nameCyberPower
Product lineStandby UPS Series
Model nameST900U
Ports & slots
Communication portsUSB
Power
AC input voltage96 V AC - 140 V AC
Input line frequency47–63 Hz
Power inputNEMA 5-15P
Volt-ampere rating900 VA
Power rating500 W
Voltage output120 V AC
AC output frequency50 Hz / 60 Hz +/- 1%
Power outlets12
Battery typeSealed Lead Acid
Runtime on batteryAt Half Load: 7.5 Minutes
At Full Load: 2 Minutes
Battery charge time8 hour(s)
AlertsOn Battery
Low Battery
Overload
Fault
Surge protection rating890 Joules
Built-in protectionInternal circuitry limiting / circuit breaker
Size & build
Product dimensions12.2 in × 7 in × 3.1 in
Product weight7.7 lb (3.49 kg)
Shipping weight4.26 kg
Package size384 × 239 × 112 mm
In the box
In the boxUPS System, User Manual, USB A+B Type Cable
Environment & compliance
Regulatory approvalsUL1778
cUL
FCC DOC Class B
CEC
RoHS Compliant
Software
Control softwarePowerPanel Personal

Other versions of this model

3 more in the same range

Questions about this item

What does the USB port on the ST900U actually let me monitor or control?

The USB port connects the UPS to a computer running PowerPanel Personal software, enabling monitoring of battery status, load level, and automatic graceful shutdown during extended outages.

Will the ST900U fit on a standard 120 V circuit with a NEMA 5-15R wall receptacle?

Yes, the unit ships with a 5 ft NEMA 5-15P input cord that plugs directly into any standard 120 V, 15 A wall outlet.

How do I install the ST900U so the battery is actually connected and not just the surge protection?

Plug the UPS into the wall, press the power button to turn it on, connect the USB cable to your PC, install PowerPanel Personal, then verify the software reports "Online" before attaching critical loads.

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