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

Key differences

Output power capacity
- ST425 uninterruptible power supply (UPS) Standby (Offline) 0.425 kVA:0.425 kVA
- ST900U uninterruptible power supply (UPS) Standby (Offline) 0.9 kVA:0.9 kVA
Output power
- ST425 uninterruptible power supply (UPS) Standby (Offline) 0.425 kVA:260 W
- ST900U uninterruptible power supply (UPS) Standby (Offline) 0.9 kVA:500 W
AC outlets quantity
- ST425 uninterruptible power supply (UPS) Standby (Offline) 0.425 kVA:8 AC outlet(s)
- ST900U uninterruptible power supply (UPS) Standby (Offline) 0.9 kVA:12 AC outlet(s)
Battery capacity
- ST425 uninterruptible power supply (UPS) Standby (Offline) 0.425 kVA:2.9 Ah
- ST900U uninterruptible power supply (UPS) Standby (Offline) 0.9 kVA:7.2 Ah
Typical backup time at full load
- ST425 uninterruptible power supply (UPS) Standby (Offline) 0.425 kVA:1.5 min
- ST900U uninterruptible power supply (UPS) Standby (Offline) 0.9 kVA:2 min
Typical backup time at half load
- ST425 uninterruptible power supply (UPS) Standby (Offline) 0.425 kVA:6 min
- ST900U uninterruptible power supply (UPS) Standby (Offline) 0.9 kVA:7.5 min
Width
- ST425 uninterruptible power supply (UPS) Standby (Offline) 0.425 kVA:210 mm
- ST900U uninterruptible power supply (UPS) Standby (Offline) 0.9 kVA:309 mm
Depth
- ST425 uninterruptible power supply (UPS) Standby (Offline) 0.425 kVA:81 mm
- ST900U uninterruptible power supply (UPS) Standby (Offline) 0.9 kVA:177 mm

Differences highlightedShow differences only

Comparison of ST425, ST900U
49 specifications	A CyberPower ST425 uninterruptible power supply (UPS) Standby (Offline) 0.425 kVA Model ST425 View product	B CyberPower ST900U uninterruptible power supply (UPS) Standby (Offline) 0.9 kVA Model ST900U View product
Features2 differ
Output power capacityDiffers	0.425 kVA	0.9 kVA
Output powerDiffers	260 W	500 W
Surge energy ratingKnown for one	890 J	Unknown — not stated by the source
EMI/RFI noise filteringKnown for one	Yes	Unknown — not stated by the source
Ports & interfaces1 differ
AC outlets quantityDiffers	8 AC outlet(s)	12 AC outlet(s)
USB portKnown for one	Unknown — not stated by the source	Yes
USB 2.0 ports quantityKnown for one	Unknown — not stated by the source	2
USB port typeKnown for one	Unknown — not stated by the source	USB Type-A
Battery3 differ
Battery capacityDiffers	2.9 Ah	7.2 Ah
Typical backup time at full loadDiffers	1.5 min	2 min
Typical backup time at half loadDiffers	6 min	7.5 min
Packaging contentidentical
Cables includedKnown for one	Unknown — not stated by the source	USB cable
Weight & dimensions4 differ
WidthDiffers	210 mm	309 mm
DepthDiffers	81 mm	177 mm
HeightDiffers	114 mm	78 mm
WeightDiffers	1.72 kg	3.49 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.