UPS battery backupsENERGY STAR certified
KOSS Maxtron II MX-10KR
10 kVA / 10 kW double conversion UPS.
Capacity
10 kVA
10 kW real power
Topology
Double Conversion
Efficiency
94.8%
weighted, as tested
Runtime @ 50%
10 min
3 min at full load
A UPS has two ratings and the lower one is the limit. This unit is rated 10 kVA and 10 kW, so the equipment plugged into its battery outlets should draw no more than about 8,000 W if you want the usual 20% headroom. How to size a UPS.
Its weighted efficiency of 94.8% compares with a median of 95.1% across 62 certified units within 25% of its capacity.
- Maker
- KOSS
- Model
- Maxtron II MX-10KR
- Apparent power rating
- 10 kVA
- Real power rating
- 10 kW
- Power factor
- 1.00
- Topology
- Double Conversion
- Intended use
- Commercial
- Battery
- Valve Regulated Lead-acid Battery
- Runtime at 50% load
- 10 min
- Runtime at 100% load
- 3 min
- Battery warranty
- 3 yr
- Weighted efficiency
- 94.8%
- Efficiency at 25 / 50 / 75 / 100% load
- 94.3% / 95.1% / 94.9% / 94.3%
- Rack mountable
- Yes, 2U
- Rated input voltage
- 110-300 V
- Rated output voltage
- 208-240 V
- Connections
- Ethernet,USB Port
- Size (H x W x D)
- 88 x 438 x 528 mm
- Maker take-back program
- No
- On the market since
- Apr 2026
- ENERGY STAR certified
- 10 Feb 2026
Source: ENERGY STAR certified uninterruptible power supplies dataset, US EPA, record 4570005, data build 2026-09-29. Figures are as the maker certified them. How we use this data.
Other makers
Machines comparable to the Maxtron II MX-10KR
Certified UPS units from other makers within 25% of its VA rating.
| Model | Capacity | Topology | Efficiency | Runtime @ 50% |
|---|---|---|---|---|
| Delta RT-10K | 10 kVA / 10 kW | Double Conversion | 95.2% | 12 min |
| Liebert GXT5-10KIRT5UXLN | 10 kVA / 10 kW | Multi-Mode Double Conversion | 95.1% | 7 min |
| Vertiv GXT5-10KIRT5UXLN | 10 kVA / 10 kW | Multi-Mode Double Conversion | 95.1% | 7 min |
| Liebert GXE-10k00TLA102C00 | 10 kVA / 9,000 W | Multi-Mode Double Conversion | 95.5% | 19 min |
| Vertiv GXE-10k00TLA102C00 | 10 kVA / 9,000 W | Multi-Mode Double Conversion | 95.5% | 19 min |
| Liebert GXT5-10KMVRT6UXLN | 10 kVA / 10 kW | Multi-Mode Double Conversion | 93.9% | 9 min |
KOSS
More KOSS UPS battery backups
| Model | Capacity | Topology | Efficiency | Runtime @ 50% |
|---|---|---|---|---|
| Axcell AX-3KWR | 3,000 VA / 2,700 W | Double Conversion | 92.0% | 12 min |