CyberPower UPS, ENERGY STAR certified
CyberPower ST425
425 VA / 260 W passive standby UPS.
Capacity
425 VA
260 W real power
Topology
Passive Standby
Efficiency
97.8%
weighted, as tested
Runtime @ 50%
6 min
2 min at full load
A UPS has two ratings and the lower one is the limit. This unit is rated 425 VA and 260 W, so the equipment plugged into its battery outlets should draw no more than about 208 W if you want the usual 20% headroom. How to size a UPS.
Its weighted efficiency of 97.8% compares with a median of 98.2% across 38 certified units within 25% of its capacity. With nothing plugged in it still draws 2.9 W, about $3.33 a year at 13¢/kWh just to stand ready.
- Maker
- CyberPower
- Model
- ST425
- Apparent power rating
- 425 VA
- Real power rating
- 260 W
- Power factor
- 0.61
- Topology
- Passive Standby
- Intended use
- Consumer
- Battery
- Valve Regulated Lead-acid Battery
- Runtime at 50% load
- 6 min
- Runtime at 100% load
- 2 min
- Battery warranty
- 3 yr
- Weighted efficiency
- 97.8%
- Efficiency at 25 / 50 / 75 / 100% load
- 95.5% / 97.9% / 98.4% / 98.5%
- Input power at no load
- 2.9 W
- Rack mountable
- No
- Rated input voltage
- 120 V
- Rated output voltage
- 120 V
- Connections
- None
- Size (H x W x D)
- 210 x 115 x 81 mm
- Maker take-back program
- No
- On the market since
- Jun 2018
- ENERGY STAR certified
- 11 Apr 2018
Source: ENERGY STAR certified uninterruptible power supplies dataset, US EPA, record 2320694, data build 2026-09-29. Figures are as the maker certified them. How we use this data.
Other makers
Machines comparable to the ST425
Certified UPS units from other makers within 25% of its VA rating.
| Model | Capacity | Topology | Efficiency | Runtime @ 50% |
|---|---|---|---|---|
| Amazon Basics ABST400 | 400 VA / 255 W | Line Interactive | 98.3% | 7 min |
| APC Back-UPS 400VA 120V Slim Flexible Mounting | 400 VA / 220 W | Passive Standby | 98.5% | 20 min |
| Tripp Lite AGBC5758 | 450 VA / 450 W | Passive Standby | 98.2% | 10 min |
| Minuteman EN450G | 450 VA / 250 W | Passive Standby | 97.9% | 10 min |
| Tripp Lite AG-0394 | 450 VA / 255 W | Passive Standby | 98.7% | 7 min |
| Tripp Lite AG-0683 | 450 VA / 240 W | Line Interactive | 99.0% | 5 min |
CyberPower
More CyberPower UPS battery backups
| Model | Capacity | Topology | Efficiency | Runtime @ 50% |
|---|---|---|---|---|
| AVRG1000LCD | 1,000 VA / 530 W | Line Interactive | 98.6% | 10 min |
| BL1250U2 | 1,200 VA / 800 W | Line Interactive | 98.7% | 11 min |
| BL1450U | 1,200 VA / 800 W | Line Interactive | 98.7% | 11 min |
| BRG1000AVRLCD | 1,000 VA / 600 W | Line Interactive | 98.5% | 9 min |
| BRG1500AVRLCD | 1,500 VA / 900 W | Line Interactive | 98.6% | 12 min |
| BRG1500AVRLCD2 | 1,500 VA / 900 W | Line Interactive | 98.8% | 11 min |
| CP1000PFCLCD | 1,000 VA / 600 W | Line Interactive | 98.8% | 9 min |
| CP1000PFCLCDa | 1,000 VA / 600 W | Line Interactive | 99.3% | 8 min |