1kVA – 1000VA Online UPS 120V Double Conversion

P91-1000 1kVA – 1000VA Online UPS 120V

The P91-1000 provides 1kVA of clean and stable electrical battery backup power to mission-critical equipment during and after a power loss or disruption events.

  • The Double Conversion Online technology, protects attached critical equipment by providing stabilization and power conditioning to incoming electrical power.
  • Zero transfer time from loss of power to battery backup for uninterrupted operation of connected equipment.
  • Peace of mind by protection for critical equipment from daily incoming electrical surges up to 800 Joules.
  • Purchase with confidence!  The P91-1000 UPS is backed by an industry leading 3-year product warranty and a $50,000 Load Protection Policy.
  • For questions or quotations please contact us via Chat, Phone or email at sales@republicpowersystems.com 

SKU: 90000905 Categories: ,

Product description

Features of the P91-1000 1kVA Online 120V UPS include:

The P91-1000 is a 1kVA Online UPS 120V that delivers continuous, pure sine wave AC power to critical electrical equipment.  The P91-1000 provides tower, rack, and wall mount configuration options.  It protects your equipment from blackouts, brownouts, sags, surges, and noise interference. The P91-1000 offers the lowest total cost of ownership by cutting energy costs and lowering heat output.

  • CAPACITY: 1 kVA / 1000 VA / 1000 Watts                        CLICK HERE TO CALCULATE YOUR BACKUP POWER REQUIREMENTS 
  • INPUT VOLTAGE: Single Phase 120VAC (6′ power cord with 5-15P plug)
  • OUTPUT VOLTAGE: 120VAC nominal (100/110/115/125 selectable)
  • RUNTIMES: 3min. @ Full power draw and 8min. @ half power draw
  • OUTPUT OUTLETS: (8x) NEMA 5-15R outlets (Programmable)
  • UPS TOPOLOGY: Double Conversion Online
  • MOUNTING OPTIONS: Tower, wall (2U units), 2-post and 4-post rack mounting configurations available
  • SCALABLE: Extended battery run-times with optional matching battery modules
  • EFFICIENCY: 98% efficient power saving operation in ECO mode
  • COMMUNICATIONS INTERFACE: RS-232, USB, EPO, intelligent slot for optional cards (Web/SNMP, Relay/dry contact, Modbus)
  • WARRANTY: 3 years electronics, 3 years battery manufacture warranty, optional 5 year warranty available (USA and Canada)
  • OPTIONS: 5 year extended warranty, bypass distribution, power distribution, 4 post rail kit, 2-post shelf kit, wall mount bracket

Benefits of the P91-1000 include:

AUTO RESTART: After full battery discharge, the P91-1000 automatically restarts when utility power returns

98% EFFICIENT OPERATION: High efficiency ECO mode lowers energy consumption, in Line Mode

SMART LCD DISPLAY: Vital monitoring and precise information is brightly displayed on the front LCD interface.

FREQUENCY CONVERTER: The P90-1000 can be programmed to convert from 50Hz to 60Hz or 60Hz to 50Hz

LOAD SHEDDING CAPABILITIES: Maximize up-time for critical loads and equipment by shedding less critical loads

EXTENDED BATTERY RUN-TIMES: Optional external battery packs for extended battery backup run-times

HOT SWAPPABLE BATTERY: Replacement batteries are hot swappable without interruption to the load

MAINTENANCE BYPASS: An optional bypass module enables the P91-1000 to be replaced or serviced without interruption of power to critical loads

SURGE PROTECTION: 800J of surge protection

$50,000 LOAD PROTECTION POLICY: protection against damaged connected equipment

Power Protection provided by the P91-1000 UPS:

  • Power problems such as electrical surges and sags
  • Total loss of electrical power or hard power “re-boots”
  • Unstable incoming power caused from outdated or faulty electrical wiring and or power distribution equipment
  • Harmonic interference from neighboring “high power draw” equipment
  • Severe weather events such as lighting storms, ice and snow storms and downed power lines
  • Unstable power generation from local utilities or on-site generation

Click here to learn more about the TOP 10 POWER ISSUES and UPS power protection features

Wide Power Input

The P91-1000 1000VA Online UPS 120V supports incoming wide AC power input. The automatic voltage regulator (AVR), protects the UPS and connected equipment from adverse voltage conditions. This wide AC input capability can offer sag and surge protection without engaging the backup batteries of the UPS. This will reduce the stress on connected critical equipment and extends the battery life of the UPS.

Double Conversion Topology
Double Conversion Technology

Double Conversion Technology

The P91-1000 is a true online double conversion uninterruptible power supply providing the ultimate in clean and stable electrical power. Incoming AC power is fed to the UPS’ rectifier converting it from AC to DC power. The converted DC power routes to a battery charging circuit and to the inverter for conversion back to AC power. The resulting “double converted” electrical power is pure sine waveform output providing near perfect electrical power for connected equipment.

To ensure 7/24 up time the double conversion UPS topology utilizes a static “bypass switch” within its circuity design. If the P91-1000 900W Online UPS 120V detects a system failure, audible alarms will sound as the bypass switch is engages. This routes power around the failed UPS and ensures critical load power to target equipment.  This very important feature allows for 100% up time for critical equipment while the UPS can be repaired or replaced.

In the event of total power failure, the UPS will power off the rectifier when the loss of power is detected. Under battery mode the internal backup batteries will continue to supply DC power to the inverter. There is no transfer time as the transition to battery power is instantaneous. This feature provides true uninterruptible power to mission critical equipment.

Technical Specifications



Rated Power Capacity (Apparent/Active)

1000VA (900W)

Voltage Range


Frequency Range

50/60Hz auto sensing

Surge protection


Rated Voltage (Output)

120VAC nominal (100/110/115 selectable)

Wave Form Type

Pure sine wave, zero transfer time

Rated Frequency

50/60Hz ± 0.5Hz

Efficiency (Maximum%)

98% ECO mode, 90% online mode

Crest factor


Overload Capacity

≤ 130% for 2 min; ≤ 200% for 10 sec; >200% for 1 sec

Battery Type

Sealed, maintenance-free lead acid

Battery quantity and size

(2) 12V 9AH

Typical Recharge Time (100%)

< 6 hours to 90%

Unit Size (HxWxD)

17.2 x 17.8 x 1.7 in

Unit Weight

28 lbs

Cord Length

6 ft, 5–15P

Output Connection

(8) NEMA 5–15R

Operating Temperature

32–104°F (0–40°C)

Acoustic Noise

< 45dBA

Operating Elevation

11,500 ft above sea level




RS-232, USB, EPO, intelligent slot for optional cards (Web/SNMP, Relay/dry contact, Modbus)

External Battery Module


External Battery Module Size (HxWxD)


External Battery Module Weight



3 years battery warranty (USA and Canada)
3 years electronics

Whats in the box

Horizontal Brackets
Software CD
Tower Pedestals
User Manual x1

Available Options

2-post Shelf Kit
4-post Rail Kit
5 year extended warranty
Bypass Distribution (XBDM)
Power Distribution (XPDU)
Wall Mount Bracket

Weight29.1 lbs
Dimensions23.6 × 19.7 × 9.45 in



Estimated Run-Time

Battery Run Time Graph