UPS applications → Scenario
UPS for Medical Equipment: Sizing, Runtime & Battery Requirements
Clinical areas need ride-through for patient monitors, workstations, and network gear during utility blips. This page is planning guidance only—life-safety and NEC Article 517 designs require licensed engineers and AHJ approval.
Who this scenario is for
Best for: Facilities teams sizing UPS for nursing stations, imaging IT interfaces, and critical care support loads with documented kW.
Not ideal for: Operating-room isolated power, emergency lighting, or hospital-wide emergency systems—those follow separate code paths.
Quick answer
Screen nursing and clinical IT clusters near 0.5–2 kW on online-class UPS frames. Size kVA with PF headroom, then battery Ah for orderly shutdown or generator bridge minutes.
How much power do medical support loads use?
Sum workstations, monitors, and network on the protected panel—exclude imaging modalities on dedicated feeds unless engineering requires ride-through.
| Device | Typical power | Notes |
|---|---|---|
| Patient monitor | 30–80 W | Varies by model and modules |
| Infusion pump (each) | 20–40 W | Steady when running |
| Clinical workstation | 80–150 W | EMR / charting PC |
| Small network switch | 20–50 W | VLAN for clinical subnet |
| Interface / gateway PC | 50–100 W | Lab or device interfaces |
Last reviewed: June 2025. Values are planning estimates—meter loads where possible.
Example: nurse station, clinic room, and imaging IT edge
| Area | Devices | Network | Total (approx.) |
|---|---|---|---|
| Nurse station | 4 monitors + 2 PCs ~600 W | 40 W | ~640 W |
| Outpatient clinic | 2 PCs + 1 monitor ~250 W | 30 W | ~280 W |
| Imaging IT edge | 2 servers ~800 W | 100 W | ~900 W |
Convert to kW and use the UPS Capacity Calculator. Many clinical IT loads favor online UPS for voltage regulation.
UPS size for medical support loads (screening chart)
Online double-conversion often specified for clinical IT—still size on measured kW, not VA nameplate alone.
| Load | Screening UPS | Typical use |
|---|---|---|
| ~0.3 kW | 1 kVA online | Single clinic room |
| ~0.7 kW | 3 kVA online | Nurse station cluster |
| ~1.5 kW | 5 kVA online | Multi-workstation bay |
| ~3 kW | 10 kVA online | Imaging IT edge rack |
Recommended backup time
- 10–15 minutes: EMR save and orderly workstation shutdown.
- 20–30 minutes: Common generator ATS bridge at hospital sites.
- 60+ minutes: Only when facilities MOP requires extended ride-through without gen.
Align minutes with facilities maintenance of plant (MOP)—not brochure labels alone.
Key variables
- Measured kW vs. nameplate: Sum workstations, monitors, and network on the protected panel—exclude dedicated imaging feeds unless required.
- Online vs. line-interactive: Clinical IT often favors online double-conversion; transfer glitches can disturb sensitive interfaces.
- Runtime vs. generator: Hospital sites often have emergency generators—UPS minutes cover ATS bridge only.
- Regulatory scope: This page does not certify life-support or NEC 517 compliance—engage PE and AHJ for binding designs.
UPS battery sizing
Example: 1.5 kW on 5 kVA with 48 V / 100 Ah often screens ~15–30 minutes for orderly shutdown before aging derates.
Workflow: Load → Capacity → Battery Ah → runtime calculator below.
Runtime calculator — verify your load
Default preset: 1.5 kW clinical cluster on 5 kVA, 48 V / 100 Ah. Measure actual bay kW before procurement.
Use UPS Runtime Calculator (medical preset)
See also: How to calculate UPS runtime · UPS battery sizing guide · Choosing a UPS system
Next steps — tools
- UPS Load Calculator — roll up device watts.
- UPS Capacity Calculator — required kVA with PF and margin.
- UPS Battery Calculator — Ah for a target minute goal.
- UPS Runtime Calculator — minutes at your kW, V, and Ah.
- How long will UPS last? — guided entry across the UPS tool chain.
Assumptions and disclaimer
Planning guidance only—not medical device certification, life-safety approval, or NEC Article 517 design. VA ranges are screening values. Confirm with licensed engineers, facility MOP, and AHJ where required.
Frequently asked questions
What size UPS for a nursing station?
Screen ~0.5–1.5 kW measured load; 3–5 kVA online UPS with headroom is a common starting point.
Does a consumer UPS meet medical IT requirements?
Rarely for critical clinical IT—plan online UPS with documented maintenance, SNMP monitoring, and PE/AHJ review where required.
How many minutes should clinical UPS provide?
Enough for orderly shutdown or until generator transfer—often 10–30 minutes at measured kW.
Can imaging equipment share the same UPS?
Only if engineering confirms inrush, harmonics, and isolation—many modalities use dedicated feeds.
Online vs line-interactive for patient monitors?
Many sites specify online UPS for clinical subnets; either must be sized on measured kW.
Is this page life-safety UPS guidance?
No—life-support and emergency systems follow separate code paths and require stamped engineering.
How much power does a patient monitor use?
Often 30–80 W steady per unit—sum all bays on the protected branch.
What battery Ah for 20 minutes at 1.5 kW?
Use the UPS Battery Calculator, then verify in the Runtime Calculator.
UPS vs generator in hospitals?
Generators cover extended outages; UPS covers ATS bridge and orderly IT shutdown.
Should lab interfaces share clinical UPS?
Only when engineering confirms load and isolation—see UPS for laboratory for analyzer-specific sizing.
Often planned together
- UPS for server rack — PACS or imaging IT racks
- UPS for laboratory — Lab analyzers on branch UPS
Related UPS scenarios
UPS applications on hub · How long will UPS last? · UPS Runtime Calculator · Runtime calculation guide · Battery sizing guide