UPS battery backupsENERGY STAR certified
Eaton S3M50K
50 kVA / 50 kW double conversion UPS.
Capacity
50 kVA
50 kW real power
Topology
Double Conversion
Efficiency
95.5%
weighted, as tested
Runtime @ 50%
-
not reported by the maker
A UPS has two ratings and the lower one is the limit. This unit is rated 50 kVA and 50 kW, so the equipment plugged into its battery outlets should draw no more than about 40 kW if you want the usual 20% headroom. How to size a UPS.
Its weighted efficiency of 95.5% compares with a median of 96.2% across 40 certified units within 25% of its capacity.
- Maker
- Eaton
- Model
- S3M50K
- Apparent power rating
- 50 kVA
- Real power rating
- 50 kW
- Power factor
- 1.00
- Topology
- Double Conversion
- Intended use
- Consumer, Commercial, Data Center
- Weighted efficiency
- 95.5%
- Efficiency at 25 / 50 / 75 / 100% load
- 95.8% / 95.9% / 94.5% / 93.3%
- Rack mountable
- No
- Rated input voltage
- 208-220 V
- Rated output voltage
- 208-220 V
- Connections
- Serial Port,Other,Ethernet,USB Port
- Size (H x W x D)
- 1200 x 442 x 850 mm
- Maker take-back program
- No
- On the market since
- Jun 2021
- ENERGY STAR certified
- 27 Jan 2026
Source: ENERGY STAR certified uninterruptible power supplies dataset, US EPA, record 4577046, data build 2026-09-29. Figures are as the maker certified them. How we use this data.
Other makers
Machines comparable to the S3M50K
Certified UPS units from other makers within 25% of its VA rating.
| Model | Capacity | Topology | Efficiency | Runtime @ 50% |
|---|---|---|---|---|
| Liebert 51SA050BAA | 50 kVA / 50 kW | Multi-Mode Double Conversion | 96.4% | 10 min |
| Vertiv 51SA050BAA | 50 kVA / 50 kW | Multi-Mode Double Conversion | 96.4% | 10 min |
| Schneider Electric Galaxy VS UPS 50kW 480V with N+1 power module | 50 kVA / 50 kW | Multi-Mode Double Conversion | 95.5% | - |
| Delta DPH-300K-HV | 50 kVA / 50 kW | Multi-Mode Double Conversion | 96.3% | 12 min |
| Delta DPH-150K-HV | 50 kVA / 50 kW | Multi-Mode Double Conversion | 96.3% | 23 min |
| Vertiv EXS 0040kTH16FN01000 | 40 kVA / 40 kW | Multi-Mode Double Conversion | 95.8% | 20 min |
Eaton
More Eaton UPS battery backups
| Model | Capacity | Topology | Efficiency | Runtime @ 50% |
|---|---|---|---|---|
| 5P1000RT2UG2-L | 1,000 VA / 920 W | Line Interactive | 98.6% | 18 min |
| 5P1150IRT2UG2-L | 1,150 VA / 920 W | Line Interactive | 98.5% | 18 min |
| 5P1550IRT2UG2-L | 1,550 VA / 1,350 W | Line Interactive | 98.9% | 12 min |
| 5P1550RT2UG2-L | 1,440 VA / 1,350 W | Line Interactive | 98.7% | 12 min |
| 5P550RG2-L | 550 VA / 495 W | Line Interactive | 98.5% | 18 min |
| 5P650IRG2-L | 650 VA / 520 W | Line Interactive | 98.4% | 16 min |
| 5PX1000IRT2UG2 | 1,000 VA / 1,000 W | Line Interactive | 98.5% | 17 min |
| 5PX1000RTG2 | 1,000 VA / 1,000 W | Line Interactive | 98.5% | 16 min |