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Reference Tools

IIS 1.5kVA - 16.7kVA

Emergency Inverters

IOTA IIS Series 1.5KVA to 16.7KVA Inverter Systems are UL Listed single-phase sine wave output inverters designed to provide power to designated emergency lighting fixtures in the event of a loss of normal power. In a power loss situation, the IOTA IIS Series will supply 1.5KVA to 16.7KVA of emergency power from the battery supply at either 50ms (ST option) or 2ms (FT option) transfer time. The IOTA IIS Series works in conjunction with any lighting load type and is capable of operating normally-on or normally-off designated fixtures in the emergency mode. The IIS Series is ideal for providing emergency power to extensive 120V, 208V, 240V, 277V, or 347V lighting arrangements that utilize multiple lamp and fixture types. The IIS Series conducts monthly and annual tests for operation readiness and logs the test results for reference as needed. IIS 1.5KVA to 16.7KVA inverters feature a durable front-access steel cabinet design and is covered with a one-year warranty.

Input Voltage

single phase 120V, 208V, 240V, 277V, or 347V

Output Voltage

single phase 120V, 208V, 240V, 277V, or 347V



Output Power

1.5kVA - 16.7kVA

Transfer Time

2ms (FT model), 50ms (ST model)

Emergency Operation

90 minutes

Load Power Factor Range

.5 lagging to .5 leading

THD (input/output)

<10% / <3%

Input Power Walk-in

Limiting inrush current to <125%,
10 times for 1 line cycle

Synchronizing Slew Rate

1Hz per second nominal

System Short Circuit


Static Voltage

+/- 2% (Load current change)
+/- 12.5% (Battery discharge)

Dynamic Voltage

+/- 2% (+/- 25% load step change)
+/- 3% (+/- 50% load step change)
recovery within 3 cycles

Inverter Overload Threshold

280% for 12 line cycles, 115% for 10 minutes

Crest Factor


Operating Temp (inverter)

0° to 40° C

Operating Temp (battery)

20° to 30° C

Storage Temp (electronics only)

-20° to 70° C

Relative Humidity

< 95%


Maintenance-free Valve Regulated Lead Acid (VRLA)

Audible Noise (standby mode)

45 dba @ 1m


UL 924 Listed
find the UL Mark on this product

*Input +/- 3%, Output in emergency +/- 0.05Hz

Advantages and Features

Product Advantages

  • Single-phase emergency system with exceptional 98% power efficiency
  • Standard and Fast Transfer options for compatibility with all lighting load types
  • Provides full light output in the emergency mode
  • Conducts required monthly and annual tests for operational readiness and logs test, event, and alarm data


  • PWM/IGBT inverter design for optimal switching speed
  • Micro-processor controlled, temperature compensating charger
  • 120 to 347 Input/Output Voltage Options
  • Valve Regulated Lead Acid (VRLA) batteries provide long life and are maintenance free
  • Low Battery Voltage Disconnect protects batteries against deep discharge
  • Includes Input Circuit Breaker and Battery Fuse Protection
  • User Programmable / Password Protected Interface
  • High-Contrast VFD display screen
  • Includes RS232 Serial Communications port
  • Durable steel cabinet design with white finish
  • Forced air cooling only while in the emergency mode with no filter requirement
  • Meets or exceeds all National Electrical Code and Life Safety Code Emergency Lighting Requirements
  • Covered by IOTA’s standard 1-Year Warranty on all electronic components and pro-rated warranty on batteries.
  • Factory Startup and Training available