Product Description
Lightalarms LMIU-250 Mini Inverter Unit 250W (IDNA) delivers pure sine wave emergency power for LED, fluorescent, and incandescent lighting loads with a compact, surface-mount steel cabinet. Standard improved self-diagnostics (non-audible) and 90-minute runtime help you meet UL 924 and Life Safety Code requirements with confidence.
Brand: Lightalarms (ABB / Emergi-Lite)
Model: LMIU-250
Series: Mini Inverter Series
Power Rating: 250W pure sine wave
Input/Output: 120V or 277V AC, 60Hz
Runtime: 90 minutes @ 250W
Diagnostics: IDNA – Improved self-diagnostics, non-audible
Battery: 12V VRLA, maintenance-free (2x pack)
Construction: 14-gauge steel, white powder coat
Mounting: Surface wall mount
Approvals: UL 924, NFPA 101, CEC Title 20
Dimensions: 27" W × 12.2" H × 7.3" D
Weight: 100 lb (45 lb without batteries)
Free shipping on orders over $250
Product Benefits
- Code-compliant egress lighting with 90 minutes of backup at 250W to meet UL 924 and NFPA 101.
- True sine wave output drives today’s LED and fluorescent loads smoothly, minimizing flicker and driver stress.
- Self-diagnostics (IDNA) automate monthly/annual testing and streamline maintenance reporting.
- Compact, durable cabinet in 14-gauge steel for reliable wall mounting in electrical rooms and corridors.
Key Features
- Load capacity: 250W @ 90 min; extended runtimes: 167W (2h), 125W (3h), 94W (4h).
- Electronics: temperature-compensated charger, low-voltage disconnect, replaceable output fuse protection.
- Lighting control override: supports 0–10V systems with factory load-shedding options at 25% or 45% brightness.
- Nexus® connectivity: optional wireless/Pro monitoring for automated logs and alerts.
- Battery system: sealed 12V VRLA (2x); typical life 8–10 years in 20–30°C environments.
Specifications
Technical Specs
| Input / Output Voltage | 120/120V or 277/277V AC, 60Hz |
| Power Rating | 250W continuous, pure sine wave |
| Transfer Time | < 1 second |
| Voltage / Frequency Regulation | ±5% / 60 Hz ±1% |
| Load Power Factor Range | 0.9 leading to 0.9 lagging |
| AC Specs (Standby) | 2.28 A @ 120V / 0.99 A @ 277V; 2.26 W standby (CEC model) |
Physical Specs
| Cabinet | 14-ga steel, white semi-gloss powder coat |
| Dimensions (W × H × D) | 27" × 12.2" × 7.3" |
| Weight | 100 lb (with batteries), 45 lb (without) |
| Replacement Battery | 2× 860.0024-L |
Performance & Compliance
| Listings | UL 924; meets or exceeds NEC & NFPA 101 |
| Programs | CEC Title 20 compliant models available |
| Environment | Recommended operating 68–86°F (20–30°C) |
Application Examples
- Office, retail, and education egress lighting circuits
- Healthcare and institutional corridors and stairwells
- Industrial and warehouse aisles (consult for high-bay LED)
- Mixed LED/fluorescent retrofit projects needing centralized backup
Installation Tips
- Use 1/4" screws with flat washers at each keyhole and ensure the wall can support the unit’s weight.
- Wire for a single voltage only (120V or 277V). Do not combine input neutral with load neutral.
- Disconnect AC and batteries before service; connect batteries only after completing field wiring.
- Perform a 1-minute manual test after energizing AC, then allow 48 hours before the full 90-minute test.
- For 0–10V dimming loads, use the built-in Lighting Control Override to force 100% during emergency.
FAQ
How long will the LMIU-250 run at full load?
It delivers 90 minutes at 250W. For extended runtimes, it supports 167W (2h), 125W (3h), and 94W (4h).
Is the IDNA version audible?
No. IDNA denotes improved self-diagnostics that are non-audible. An audible option is available if required.
Can I use it with LED drivers and 0–10V dimming?
Yes. It supports LED/fluorescent/incandescent loads and includes a 0–10V lighting control override. Factory load-shedding options at 25% or 45% are available.
What are the cabinet size and weight?
The enclosure is 27" × 12.2" × 7.3" and weighs 100 lb (45 lb without batteries).
What maintenance is required?
The VRLA batteries are maintenance-free. Perform code-required monthly/annual tests; replace batteries when they no longer support the 90-minute test.
Any mounting cautions?
Mount securely with 1/4" hardware at each keyhole. Do not energize until all steps are complete and never tie input neutral to load neutral.
