UPS battery backupsENERGY STAR certified
KOSS Axcell AX-3KWR
3,000 VA / 2,700 W double conversion UPS.
Capacity
3,000 VA
2,700 W real power
Topology
Double Conversion
Efficiency
92.0%
weighted, as tested
Runtime @ 50%
12 min
4 min at full load
A UPS has two ratings and the lower one is the limit. This unit is rated 3,000 VA and 2,700 W, so the equipment plugged into its battery outlets should draw no more than about 2,160 W if you want the usual 20% headroom. How to size a UPS.
Its weighted efficiency of 92.0% compares with a median of 93.1% across 95 certified units within 25% of its capacity.
- Maker
- KOSS
- Model
- Axcell AX-3KWR
- Apparent power rating
- 3,000 VA
- Real power rating
- 2,700 W
- Power factor
- 0.90
- Topology
- Double Conversion
- Intended use
- Commercial
- Battery
- Valve Regulated Lead-acid Battery
- Runtime at 50% load
- 12 min
- Runtime at 100% load
- 4 min
- Battery warranty
- 2 yr
- Weighted efficiency
- 92.0%
- Efficiency at 25 / 50 / 75 / 100% load
- 89.2% / 91.8% / 92.1% / 92.0%
- Rack mountable
- No
- Rated input voltage
- 220-240 V
- Rated output voltage
- 220-240 V
- Connections
- Ethernet,USB Port
- Size (H x W x D)
- 88 x 438 x 630 mm
- Maker take-back program
- No
- On the market since
- Sep 2025
- ENERGY STAR certified
- 23 Dec 2025
Source: ENERGY STAR certified uninterruptible power supplies dataset, US EPA, record 4520354, data build 2026-09-29. Figures are as the maker certified them. How we use this data.
Other makers
Machines comparable to the Axcell AX-3KWR
Certified UPS units from other makers within 25% of its VA rating.
| Model | Capacity | Topology | Efficiency | Runtime @ 50% |
|---|---|---|---|---|
| CyberPower PR3000RTXL2UHVA | 3,000 VA / 3,000 W | Line Interactive | 98.9% | 11 min |
| Delta RT-3K | 3,000 VA / 2,700 W | Double Conversion | 92.0% | 12 min |
| CyberPower OL3000RTXL2UHV | 3,000 VA / 2,700 W | Double Conversion | 92.0% | 11 min |
| CyberPower OL3000RTXL2UHVN | 3,000 VA / 2,700 W | Double Conversion | 92.0% | 11 min |
| CyberPower OL3000RTXL2UHVTAA | 3,000 VA / 2,700 W | Double Conversion | 92.0% | 11 min |
| CyberPower OL3000RT JP | 3,000 VA / 2,700 W | Double Conversion | 91.5% | 11 min |
KOSS
More KOSS UPS battery backups
| Model | Capacity | Topology | Efficiency | Runtime @ 50% |
|---|---|---|---|---|
| Maxtron II MX-10KR | 10 kVA / 10 kW | Double Conversion | 94.8% | 10 min |