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Product comparison · 2 uninterruptible power supplies (upss)

CyberPower ST425 uninterruptible power supply (UPS) Standby (Offline) 0.425 kVA vs CyberPower ST900U uninterruptible power supply (UPS) Standby (Offline) 0.9 kVA

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  • 43specifications compared
  • 10differ
  • 33identical
  • 6known for one product only

Key differences

  • Output power capacity
    • 0.425 kVA
    • 0.9 kVA
  • Output power
    • 260 W
    • 500 W
  • AC outlets quantity
    • 8 AC outlet(s)
    • 12 AC outlet(s)
  • Battery capacity
    • 2.9 Ah
    • 7.2 Ah
  • Typical backup time at full load
    • 1.5 min
    • 2 min
  • Typical backup time at half load
    • 6 min
    • 7.5 min
  • Width
    • 210 mm
    • 309 mm
  • Depth
    • 81 mm
    • 177 mm

Side by side

Differences highlightedShow differences only
49 specifications
A

CyberPower

ST425 uninterruptible power supply (UPS) Standby (Offline) 0.425 kVA

Model ST425

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B

CyberPower

ST900U uninterruptible power supply (UPS) Standby (Offline) 0.9 kVA

Model ST900U

View product
Features2 differ
UPS topologyStandby (Offline)Standby (Offline)
Output power capacityDiffers0.425 kVA0.9 kVA
Output powerDiffers260 W500 W
WaveformPseudo sinePseudo sine
Input operation voltage (min)96 V96 V
Input operation voltage (max)140 V140 V
Input frequency47/63 Hz47/63 Hz
Output operation voltage (min)120 V120 V
Output operation voltage (max)120 V120 V
Output frequency50/60 Hz50/60 Hz
Transfer time (Line Mode to Battery Mode)8 ms8 ms
Surge protectionYesYes
Power protection featuresOverloadOverload
Audible alarm(s)YesYes
Audible alarm modesAlarm when on battery, Fault, Low battery alarm, Overload alarmAlarm when on battery, Fault, Low battery alarm, Overload alarm
Socket circuit breakerYesYes
Surge energy ratingKnown for one890 J
EMI/RFI noise filteringKnown for oneYes
Ports & interfaces1 differ
AC outlet typesNEMA 5-15RNEMA 5-15R
Power plugNEMA 5-15PNEMA 5-15P
AC outlets quantityDiffers8 AC outlet(s)12 AC outlet(s)
USB portKnown for oneYes
USB 2.0 ports quantityKnown for one2
USB port typeKnown for oneUSB Type-A
Battery3 differ
Battery technologySealed Lead Acid (VRLA)Sealed Lead Acid (VRLA)
Battery capacityDiffers2.9 Ah7.2 Ah
Battery voltage12 V12 V
Number of batteries supported11
Typical backup time at full loadDiffers1.5 min2 min
Typical backup time at half loadDiffers6 min7.5 min
Battery recharge time8 h8 h
Designidentical
Form factorCompactCompact
Product colourBlackBlack
Cable length1.5 m1.5 m
LED indicatorsPowerPower
Operational conditionsidentical
Operating temperature (T-T)0 - 40 °C0 - 40 °C
Storage temperature (T-T)-15 - 45 °C-15 - 45 °C
Operating relative humidity (H-H)0 - 95%0 - 95%
Operating altitude0 - 3000 m0 - 3000 m
Non-operating altitude0 - 15000 m0 - 15000 m
Packaging contentidentical
Cables includedKnown for oneUSB cable
ManualYesYes
Certificatesidentical
Compliance certificatesRoHSRoHS
Sustainabilityidentical
Sustainability certificatesENERGY STARENERGY STAR
Safety regulation & standardsidentical
SafetyUL1778, cUL, FCC DOC B, CECUL1778, cUL, FCC DOC B, CEC
Weight & dimensions4 differ
WidthDiffers210 mm309 mm
DepthDiffers81 mm177 mm
HeightDiffers114 mm78 mm
WeightDiffers1.72 kg3.49 kg

A dash means the value is not stated by the source. Unknown values are never counted for or against a product, and there is no overall score.

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