Choosing the Right Emergency Power System for Healthcare Facilities

Every hospital needs reliable emergency power, but how you deliver it is a critical design choice. Two of the most common approaches—Central Battery Systems and Distributed Inverters—each offer unique benefits depending on the type of space, budget, and operational priorities.

Central Battery Systems: One Hub for Many Fixtures

Central battery systems use a single, room-sized inverter and battery bank to feed multiple emergency circuits. This setup provides several advantages:

• Fast Transfer: “No-break” models can relight luminaires in under 2 ms—critical for ORs and ICUs where any outage is unacceptable.
• Centralized Maintenance: All batteries are in one conditioned room, making inspections and integration with the building management system easier.
• Cost Efficiency: Lower cost per fixture, a single test point, and spare capacity for future loads offset future labor.
• Testing & Records: Remote panels automate NFPA’s monthly 30-second and annual 90-minute tests, producing a single downloadable log for Joint Commission audits.

Best fit for:

• New towers or floors with many emergency and task fixtures.
• Spaces where zero interruption is non-negotiable (e.g., ORs, ICUs).

Distributed Inverters: Flexibility at the Fixture Level

Distributed inverters place small units at the circuit or even luminaire level. They’re ideal when renovations or phased upgrades make pulling new homeruns costly:

• Flexible Installation: Units fit above ceilings, in closets, or within fixtures—minimal HVAC impact.
• Zero Transfer for Normally-Off Luminaires: Fixture-level packs deliver instant relight.
• Scalable Upgrades: Add units as spaces convert without oversizing a main battery room.
• Isolated Failures: If one inverter fails, only that zone or fixture is affected—others stay lit.

Best fit for:

• Phased renovation projects in scattered wings.
• Outpatient wings or mobile units.
• Budget-conscious upgrades over time.

Compliance & Code Essentials

No matter which approach you choose, your emergency power system must meet life-safety codes:

• NFPA 101 Life-Safety Code: Luminaires must relight within 10 seconds and stay on ≥90 minutes.
• NFPA 99 Essential Electrical System (EES): Splits loads into Life-Safety, Critical, and Equipment branches.
• NEC Article 517: Requires separate automatic-transfer switches and wiring for each branch.
• Joint Commission: Monthly 30-second functional tests and annual 90-minute load tests are auditable.

How LiteSource Helps

LiteSource works with leading manufacturers to translate complex code requirements into clear fixture specs. Our healthcare team provides:

• Single-source emergency lighting solutions.
• Fast, accurate quotes.
• Support from design through post-installation.

Download the full Healthcare Emergency Power: Central Battery vs. Distributed Inverters” guide to see all the specs and scenarios in one place, and contact us at [email protected] or 919.555.0123 to discuss compliant, safe, and reliable emergency lighting for your space.