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The IOTA IIS-550-HE is a UL Listed stand-alone pure sine wave output inverter designed to provide power to designated emergency lighting fixtures. In a power loss situation, the IOTA IIS-550-HE will supply 550 watts of emergency power from the onboard battery supply. The IOTA IIS-550-HE works in conjunction with incandescent, LED, and fluorescent lamp and fixture types and will automatically run switched, normally-on, or normally-off designated emergency fixtures. The IIS-550-HE is ideal for applications requiring an emergency source for lighting arrangements that utilize multiple lamp and fixture types. The IOTA IIS-550-HE features increased inrush capability to prevent shutdown caused by inrush currents, allowing operation of loads at the full rated output of the unit with no need for circuit de-rating. The IIS-550-HE is designed for high-efficiency performance and is certified in the CA Title 20 Appliance Efficiency Database. The IIS-550-HE also features dimming relay leads to accommodate 0-10V dimming applications. The IIS-550-HE is available in a surface mount housing and comes with a three-year warranty and seven-year pro-rata battery warranty.

Input Voltage

(Universal, 2-wire) 120-277V, 60Hz

Input Rating (bulk)

750 Watts

Output Voltage

(auto-detect) 120/277V, 60Hz

Output Power

550 Watts (@ .9 leading to .9 lagging PF)

Lamps Operated

LED (per NEMA 410), Fluorescent, Incandescent

Transfer Time

less than 1 second

Surge Protection

Meets ANSI/IEEE C62.41.2-2002

Emergency Operation

90 minutes

Frequency Regulation

+/- 1 Hz (<2%)

Load Power Factor Range

.9 leading to .9 lagging

Operating Temp

20° to 30° C


Valve Regulated Lead Acid (VRLA)


163 lbs


UL 924 Listed
CA T20 Appliance Efficiency Database
find the UL Mark on this product

Advantages and Features

Product Advantages

  • High Efficiency Performance meets CA T20 battery charger efficiency standards.
  • Operates load to its fully-rated capacity.
    Inrush capability eliminates need for circuit de-rating.
  • Full light output in the emergency mode
  • Dimming Relay for 0-10V dimming applications


  • Pure sine wave output
  • Operates incandescent, LED, and fluorescent fixtures
  • Includes dual-purpose momentary contact test switch and red charging indicator
  • Universal Input voltage 120-277 60Hz
  • High efficiency pure sine wave inverter
  • Variable-rate, high efficiency charger
  • Valve Regulated Lead Acid (VRLA) battery provides long life and is maintenance free
  • Line voltage allows for remote mounting of emergency fixtures at distances up to 1000 feet
  • Low Battery Voltage Disconnect and Line Latch Protection
  • Allows for emergency operation of switched or unswitched fixtures
  • Meets or exceeds all National Electrical Code and Life Safety Code Emergency Lighting Requirements
  • Durable 16-gauge steel housing design with white semi-gloss powder-coat paint finish
  • RoHS Compliant
  • 3/7 Pro-Rata Warranty
IIS-550-HE Dimensions: Length - 19.75 in., Width - 11 in., Height - 22 in.

Length - 19.75 in.

Width - 11 in.

Height - 22 in.