Best Solar Generator for Medical Equipment at Home

If you're reading this, someone in your house depends on a machine that needs electricity. That changes the tone of everything below.

So let's start with the part that matters most, before any product talk.

Size for double, then check surge

Normal sizing advice adds 30% headroom. For medical equipment, double your calculation.

Reasons: outages run longer than forecast, cold reduces capacity, batteries age, and the cost of being wrong is not spoiled food.

Then check the surge rating separately. Anything with a compressor — a concentrator, some pumps — spikes at startup. A unit that can't supply that instant trips regardless of how full it is.

What the common equipment actually draws

These are typical figures. Get your own model's real draw from its label or your supplier — variation between models is large and this is not a place to rely on an internet estimate.

Look at the oxygen concentrator row. That is the load that changes your budget, because it runs continuously and it runs all night.

What we'd buy

CPAP only: roughly 700–1,000Wh

A size bracket rather than one product, because the humidifier setting moves the requirement more than the model choice does.

Around 700Wh covers a night with the humidifier on, or two nights without. verify Units at this size are light, quiet at these loads, and sit on a nightstand without dominating the room.

Not enough for: anyone with an oxygen concentrator. A continuous 350W load is a different problem entirely and nothing in this bracket is close.

Before you buy: measure your own machine. CPAP draw varies enough between models and pressure settings that a generic figure is a starting point, not an answer — and for equipment someone depends on overnight, the margin needs to be real rather than estimated.

CPAP plus the fridge: EcoFlow DELTA 2

1,024Wh, 1,800W output. Runs the CPAP all night and still protects the food, which is the realistic combined problem for most households.

Refills from the wall in about 80 minutes, so a brief return of power genuinely restores your night. verify

Who it's wrong for: continuous high-draw equipment. Same limitation.

Oxygen concentrator, one night: Bluetti AC200L

2,048Wh. Roughly five hours on a 350W concentrator with real-world losses — so this is one night with careful management, not two.

If that sounds tight, it is. That's the honest number, and it's why the doubling rule matters here.

Who it's wrong for: anyone who needs multi-day coverage. Then you're in the next category.

Multi-day, or life-critical: EcoFlow DELTA Pro 3

4,096Wh, expandable, with 240V if you also need a well pump.

At this level you should also be pricing a standby generator and talking to an electrician about a transfer switch. It stops being a purchase and becomes an installation.

Practical things that cost nothing

Turn the CPAP humidifier off. It roughly halves the draw. A dry throat for one night beats a dead battery at 4am.

Use the DC output where your device supports it. Running through the AC inverter converts DC to AC and back to DC, losing energy twice. Check the voltage and polarity carefully first — getting it wrong damages the device.

Keep it plugged in permanently. LiFePO4 units are designed for this, and it means the pack is at 100% whenever the grid drops instead of at 60%.

Test it under real load before you need it. Ten minutes, on a normal day. Finding out your unit trips on the concentrator's startup is not something to discover in an emergency.

What we would not buy

A "medical battery" from a medical supply company at three times the price — unless it's the manufacturer's own unit for your specific device, in which case it may genuinely be the right choice. A generic branded battery at a medical markup usually isn't.

Anything under 500Wh for a concentrator. It will not last and the false confidence is worse than having nothing.

A gas generator as the primary plan. It cannot run indoors, and carbon monoxide kills people every year after storms. For medical equipment specifically, the battery's ability to sit safely in the same room is the entire point.

The honest summary

For a CPAP, this is a solved problem for a few hundred dollars.

For a concentrator, it's expensive, and one battery buys you one night. Plan accordingly — and please make the supplier call and the utility registration today, before you buy anything at all.