Montreal General Hospital needed seamless backup power for its ICU and operating theatres — equipment where even a 10-second generator-start gap is unacceptable. Here's how we specified, installed, and now maintain a UL 60601-1 certified Powervar medical-grade UPS feeding the critical load panel for bedside monitors, ventilators, and infusion pumps.
Why a hospital needs a UPS, not just a generator
Emergency generators take roughly 8–12 seconds to start, stabilise, and accept load. In a Level 1 acute-care hospital like Montreal General, that window is long enough to lose an anaesthesia machine mid-procedure, reboot a ventilator, or drop the telemetry feed from an ICU bay. Only an Uninterruptible Power Supply can bridge that gap with a zero-transfer handover while the generator spins up.
MGH operates 479 beds across acute care, ICU, and multiple operating theatres. Its facilities team approached UPSPLUSBATTERY to design a code-compliant, medical-grade UPS tier sitting between the hospital mains and the existing generator backup — one that could be audited against Canadian electrical standards, integrate cleanly with biomed's workflow, and service hot-swap battery replacements without taking critical equipment offline.
Project scope
Site survey and load analysis
Before specifying hardware, our team walked the ICU and operating-theatre circuits with hospital biomed staff. The load analysis identified the critical devices that could not tolerate any dip — bedside monitors, ventilators, syringe and infusion pumps, and the local telemetry gateway — and sized the UPS to the actual drawn wattage plus a reserve margin. Ventilation, floor load, and noise proximity to patient areas were all factored into the install location.
Selecting the Powervar Security II Medical Series
The Powervar Security II Medical Series was chosen because it's purpose-built for patient-vicinity use, not a data-centre UPS relabelled for healthcare. Key qualifications:
- UL 60601-1 (3rd Edition) certified for use within the patient vicinity — the governing Canadian/North American standard for medical electrical equipment.
- Built-in low-impedance isolation transformer — filters noise, voltage spikes, and common-mode interference that sensitive medical devices are particularly intolerant of.
- Line-interactive topology with true sine-wave output — matches the waveform expected by medical-grade power supplies (see our line-interactive vs online UPS guide for topology trade-offs).
- Leakage current below 300 µA on connected equipment — well inside hospital-grade safety limits.
- Hospital-grade receptacles and input plug — matches the receptacle standard used throughout MGH's critical load panel.
- User hot-swap batteries with auto battery testing and alarms — biomed can replace packs on a schedule without shutting down the protected load.
Technical specification as installed
- Model: Powervar Security II Medical Series, 1.5 kVA / 1,440 VA, 120 V output
- Battery configuration: Internal sealed lead-acid, ~20 minutes runtime at the protected load — well beyond the ~10 second generator startup plus safety buffer
- Monitoring: SNMP/web interface for real-time status and alert push to the facilities team
- Compliance: UL 60601-1 (3rd Ed.), CAN/CSA C22.2 enclosure and wiring
- Weight: ~45 kg with batteries, floor-mounted in the ICU-adjacent electrical closet
Installation
The cutover was scheduled during a planned maintenance window with a rolling migration of circuits so no patient-facing equipment ever lost power for more than the UPS transfer interval. Our certified technicians worked alongside MGH's biomed and electrical staff across four stages:
1. Physical placement
The unit was moved to the ICU-adjacent electrical closet, floor-mounted on a service-accessible platform with ventilation clearance checked against the UPS's heat dissipation profile.
2. Electrical integration
A dedicated 120 V circuit was landed into the closet's panel to feed the UPS input. The UPS output was wired into the critical-load distribution panel feeding the ICU monitors, ventilators, and infusion pumps. An external maintenance-bypass switch was added so future battery swaps and UPS servicing can happen with zero downtime on the protected load — an essential feature for any hospital deployment.
3. Configuration and live test
Output voltage regulation and alarm thresholds were tuned to MGH's requirements. We then ran a live outage simulation: mains power was cut to the UPS input, and the Powervar handed over to battery with no interruption observed on any connected device. The generator subsequently started, stabilised, and the UPS transitioned back to conditioned mains — end-to-end, no dropped sessions.
4. Training and handover
Hospital biomed and maintenance staff received on-site training on the SNMP dashboard, hot-swap battery procedure, and alarm interpretation, plus the maintenance schedule and our 24/7 emergency escalation contact. Ongoing service is delivered through our UPS preventive maintenance program.
Products deployed
Explore the product families used on this project:
Results and impact
Since commissioning, the Powervar UPS has delivered uninterrupted power to the protected circuits across every observed mains event, including planned generator tests. Biomed feedback has been positive enough that MGH is actively scoping an expansion of the same topology to additional departments. The maintenance-bypass switch has already been used once for a scheduled battery inspection — with zero interruption on the critical load, validating the install topology.
Frequently asked questions
How long do medical-grade UPS batteries last?
Sealed lead-acid batteries used in medical UPS systems typically last 3–5 years under proper temperature and charge-cycle conditions. At MGH, batteries are tested on a scheduled interval as part of the preventive maintenance contract. See our UPS battery replacement service for scheduled changeouts.
Are Powervar UPS batteries hot-swappable?
Yes. The Powervar Security II Medical Series supports user hot-swappable batteries — modules can be replaced without shutting down the UPS or dropping the protected load. This is a critical feature for any hospital deployment where taking equipment offline for routine service isn't an option.
What does UL 60601-1 certification mean for a hospital UPS?
UL 60601-1 (and its Canadian equivalent CAN/CSA C22.2 No. 60601-1) is the medical electrical equipment safety standard governing patient-vicinity use. A UPS carrying this certification has been tested for leakage current, isolation, single-fault safety, and enclosure behaviour to limits that standard data-centre UPS units don't meet. If the UPS sits inside the patient vicinity, this certification isn't optional.
Can runtime be extended beyond 20 minutes?
Yes, typically by adding external battery packs or by reducing the protected load to only the most critical devices. For hospital deployments we generally size for the generator startup window plus a safety margin rather than for extended autonomy — the generator is the long-duration backup; the UPS is the seamless bridge.
Do you service hospitals outside Montreal?
Yes. We ship across Canada and our installation, maintenance, and emergency-service network (operated through our sister brand GDF Technologies) covers major urban centres including Toronto, Ottawa, Québec City, Vancouver, Calgary, and Edmonton, plus remote and industrial sites nationally.
Whether you're buying the hardware or looking for a team to install and maintain it, we can help — directly or through our service partner GDF Technologies.
Online double-conversion UPS units, hospital-grade battery cartridges, and compatible replacement batteries — shipped across Canada from our Delson, QC warehouse.
Shop online UPS systems →Site survey, code-compliant install, preventive maintenance contracts, and 24/7 emergency service across Canada — CSA C22.1, NFPA 111, IEEE 450/1188.
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