UPS battery backupsENERGY STAR certified
Delta RT-1K
1,000 VA / 900 W double conversion UPS.
Capacity
1,000 VA
900 W real power
Topology
Double Conversion
Efficiency
90.2%
weighted, as tested
Runtime @ 50%
12 min
3 min at full load
A UPS has two ratings and the lower one is the limit. This unit is rated 1,000 VA and 900 W, so the equipment plugged into its battery outlets should draw no more than about 720 W if you want the usual 20% headroom. How to size a UPS.
Its weighted efficiency of 90.2% compares with a median of 98.6% across 177 certified units within 25% of its capacity. With nothing plugged in it still draws 31.7 W, about $36 a year at 13¢/kWh just to stand ready.
- Maker
- Delta
- Model
- RT-1K
- Apparent power rating
- 1,000 VA
- Real power rating
- 900 W
- Power factor
- 0.90
- Topology
- Double Conversion
- Intended use
- Consumer
- Battery
- Valve Regulated Lead-acid Battery
- Runtime at 50% load
- 12 min
- Runtime at 100% load
- 3 min
- Battery warranty
- 3 yr
- Weighted efficiency
- 90.2%
- Efficiency at 25 / 50 / 75 / 100% load
- 97.8% / 89.4% / 90.6% / 90.7%
- Input power at no load
- 31.7 W
- Rack mountable
- Yes
- Rated input voltage
- 100-120 V
- Rated output voltage
- 100-120 V
- Connections
- Serial Port,Ethernet,USB Port
- Size (H x W x D)
- 88 x 440 x 335 mm
- Maker take-back program
- No
- On the market since
- Nov 2018
- ENERGY STAR certified
- 11 Sep 2018
Source: ENERGY STAR certified uninterruptible power supplies dataset, US EPA, record 2325951, data build 2026-09-29. Figures are as the maker certified them. How we use this data.
Other makers
Machines comparable to the RT-1K
Certified UPS units from other makers within 25% of its VA rating.
| Model | Capacity | Topology | Efficiency | Runtime @ 50% |
|---|---|---|---|---|
| CyberPower OL1000RT JP | 1,000 VA / 900 W | Double Conversion | 91.1% | 20 min |
| CyberPower OL1000RTN JP | 1,000 VA / 900 W | Double Conversion | 91.1% | 20 min |
| CyberPower OL1000RTXL2U | 1,000 VA / 900 W | Double Conversion | 91.1% | 20 min |
| CyberPower OL1000RTXL2UN | 1,000 VA / 900 W | Double Conversion | 91.1% | 20 min |
| CyberPower OL1000RTXL2UNTAA | 1,000 VA / 900 W | Double Conversion | 91.1% | 20 min |
| CyberPower OL1000RTXL2UTAA | 1,000 VA / 900 W | Double Conversion | 91.1% | 20 min |
Delta
More Delta UPS battery backups
| Model | Capacity | Topology | Efficiency | Runtime @ 50% |
|---|---|---|---|---|
| DPH-105K-LV | 15 kVA / 15 kW | Multi-Mode Double Conversion | 95.6% | - |
| DPH-150K-HV | 50 kVA / 50 kW | Multi-Mode Double Conversion | 96.3% | 23 min |
| DPH-250K-HV | 250 kVA / 250 kW | Multi-Mode Double Conversion | 94.9% | 10 min |
| DPH-300K-HV | 50 kVA / 50 kW | Multi-Mode Double Conversion | 96.3% | 12 min |
| DPH-500K-HV | 200 kVA / 200 kW | Multi-Mode Double Conversion | 99.1% | 11 min |
| DPH-60K-LV | 15 kVA / 15 kW | Multi-Mode Double Conversion | 95.5% | 12 min |
| RT PRO-1K | 1,000 VA / 1,000 W | Multi-Mode Double Conversion | 91.4% | 10 min |
| RT PRO-2K | 2,000 VA / 2,000 W | Multi-Mode Double Conversion | 93.4% | 12 min |