Backup Power for Medical Equipment: the Three Specs That Actually Matter

1 · Switchover time: 30 ms or faster

Plug your device into the power station and the station into the wall, and it acts as a bridge: when grid power cuts, it flips to battery. The flip takes time — and interruptions in the 200–500 ms range are enough to reset or alarm therapy devices. The units below publish 10–30 ms figures, fast enough that most equipment rides through without noticing.

The honest caveat, straight from the manuals: none of these is a certified online UPS. Jackery's manuals call their 20 ms mode a "non-professional UPS function" and exclude medical and life-support equipment; Bluetti's manuals caution against relying on the mode for devices requiring a dedicated UPS; EcoFlow labels its 30 ms units "basic EPS". We therefore split the table into marketed UPS modes and basic EPS modes — and for anything life-critical, your device maker's backup guidance outranks every row of it.

2 · Pure sine wave output

Medical power supplies expect the smooth AC waveform the grid delivers. "Modified sine" inverters approximate it with steps — fine for a drill, risky for a compressor or sensitive electronics. Every station in our catalog outputs pure sine wave, verified against manufacturer documentation, so within this catalog you don't need to shop on this spec. Outside it, always check.

3 · Battery chemistry: LiFePO4 for a device you depend on

LiFePO4 (LFP) packs are rated for 3,000–6,000 charge cycles before dropping to 80% capacity — a decade of daily use — versus roughly 500 cycles for older NMC packs. For equipment you'll rely on nightly, that difference is the difference between a purchase and a subscription. Of our current catalog, only the Goal Zero Yeti 1000X still uses NMC.

Every unit we track, scored for medical backup

*CPAP nights assume 40 W for 8 h without humidification; O₂ concentrator hours assume a 320 W home unit running continuously. All figures use usable capacity (85% of rated) and carry our standard ±15% band. Not listed: Goal Zero Yeti 1000X, Jackery Explorer 300 Plus, Goal Zero Yeti PRO 4000 — no passthrough switchover mode, so a cutover means a hard gap.

Build your exact medical load in the Load Builder →

A power station is one layer, not the plan

Emergency-preparedness guidance for powered medical devices is consistent: build layers. A power station bridges hours to days; solar input can stretch it; but a multi-day outage with a ventilator or home dialysis in the house calls for a written relocation plan (family, hospital, or shelter with power), spare consumables, and your equipment provider's emergency line. Plan for twice the runtime you think you need.

• FDA: emergency situations for medical devices — the federal guidance and checklist for device users.
• HHS emPOWER — federal program mapping electricity-dependent medical equipment users for emergency response.
• Your utility's Medical Baseline / Life Support registry — extra outage notice and, with some utilities, priority restoration. Search "your utility medical baseline"; enrollment is free and usually needs one form from your physician.

VoltScout is an independent comparison site, not a medical provider. Nothing here is medical advice — for life-critical equipment, your physician and device manufacturer set the requirements.

Common questions

Can a portable power station run a CPAP overnight?

Yes, easily. A CPAP draws about 40 W (roughly 85–125 W with a heated humidifier). Even a 300 Wh unit covers a full night without humidification; a 1,000 Wh class unit covers 2–3 nights. Turning the humidifier off triples your nights per charge.

What switchover time do I need for medical devices?

Look for 30 ms or faster. Interruptions in the 200–500 ms range can cause therapy devices to reset or alarm. Every unit we rank on this page publishes a 10–30 ms figure — but note whether it is a marketed UPS mode or a basic EPS the maker excludes from life-support use.

Is a power station a UPS?

Not in the certified, data-center sense. Manufacturer manuals are explicit: these are consumer passthrough modes, not online double-conversion UPS systems. For a ventilator or other life-critical device, follow the device maker’s backup guidance and treat any power station as one layer of a plan, never the whole plan.

Why does pure sine wave matter?

Medical device power supplies expect utility-grade AC. Modified sine wave can overheat or damage motors and confuse sensitive electronics. Every station in our catalog outputs pure sine wave, verified against manufacturer documentation.

Does my utility have a program for medical equipment?

Most large utilities run a Medical Baseline or Life Support registry: extra notification before planned outages and, with some utilities, priority restoration. Search your utility’s name plus “medical baseline”. It costs nothing to enroll.