E91 10-20kW Online Tower UPS


208/120VAC three phase UPS

Unity power factor three-phase UPS for Edge facilities and other critical IT applications

E91 UPS provides reliable three phase double conversion power for edge facilities, small data centers, network closets, and industrial applications.

E91 features unity output power factor to support up to 25% more critical loads than typical UPSs. E91’s touch screen LCD allows vital monitoring with interactive power one-line, alarms and UPS status. External battery packs are available for longer runtimes.


Product Snapshot

  • Available models: 10kVA, 15kVA, 20kVA
  • Unity power factor
  • Approvals: UL, cUL, FCC, Energy Star 2.0
  • 2 years electronics, 2 years battery warranty (USA and Canada)
MODEL NUMBER E91-10k E91-15k E91-20k
CAPACITY Power rating 10kVA (10kW) 15kVA (15kW) 20kVA (20kW)
INPUT Voltage / Range 208Y/120VAC or 220Y/127 +20/-15% VAC three-phase*
Frequency 46–54Hz or 56-64Hz
OUTPUT Voltage / Frequency 208/120VAC or 220/127VAC / 50/60±0.1%
Efficiency up to 94% online mode or 98% ECO mode
Overload capacity 150% for 1 min, 125% for 10 min, 110% for 60 min
BATTERY Battery type Sealed, maintenance-free lead acid
Battery Quantity (40) 12V/9AH (60) 12V/9AH
Max charging adjustable Up to 12A adjustable
PHYSICAL Dimensions (W x D x H) 9.9" x 26.3" x 32.3" 11.9” x 34” x 40.2”
Weight 315 lbs 504 lbs 510 lbs
Optional Battery Pack  Model EBP09-2 / EBP09-5
Battery quantity and size (40) 12V 9AH / (100) 12V 9AH
Dimensions (W x D x H) 11.9" x 34" x 40.2"
Weight   310 lbs / 670 lbs
Output receptacles (4) L21-20R & (4) 3P 20A breakers, (4) L21-30R & (4) 3P 30A breakers
ENVIRONMENT Operating temperature 32–104°F (0–40°C)
Audible noise <55dB from 1M distance for 10/15kVA; <58dB from 1M distance for 20kVA
Altitude 5,200 ft above sea level*
APPROVALS UL, cUL, FCC. 10, 15, & 20kW are Energy Star 2.0
WARRANTY 2 years electronics, 2 years battery warranty (USA and Canada)
COMMUNICATIONS INTERFACE RS-232, EPO, USB, intelligent slot for optional cards (Web/SNMP, Relay/dry contact)
INCLUDED IN BOX User manual, RS-232 communication cable, USB cable
AVAILABLE OPTIONS External maintenance bypass, output distribution, external battery cabinets

*Battery life is reduced above 30°C, UPS capacity derates above 40°C and 5,200 ft above sea level