Running a Home Oxygen Concentrator Overnight at Camp: The Watt-Hour Math That Actually Matters

374 watts. That’s what Mike Sokol actually measured using a Kill-o-Watt meter on a 3 L/min continuous-flow concentrator over 14+ hours—not the manufacturer’s “310 watts average” tag. Real draw. Real data. February 2026.

If you’re packing oxygen for an overnight backcountry run or an RV trip past the grid, that number changes everything. The difference between “my power station will make it” and “I bought the wrong battery” lives in those 74 extra watts and the math that follows.

The Overnight Watt-Hour Equation

Here’s the formula we’re using tonight:

Device wattage ÷ inverter efficiency × hours needed = watt-hours required

Using the 374W measured draw:

• 374 watts ÷ 0.85 (typical DC-to-AC inverter loss) = 440 watts nominal draw
• 440 watts × 8 hours = 3,520 watt-hours needed for a full night

That’s your baseline. No safety margin yet.

A Bluetti AC200L (2,048 Wh) gets you to ~58% depth-of-discharge for the night—doable in a pinch, not comfortable. A Jackery 1000 v2 (1,024 Wh) falls short. An EcoFlow Delta 2 Max (2,048 Wh) sits in the same tight zone. You want EcoFlow Delta Pro (3,600 Wh) or Bluetti AC500 + B300S expansion (5,120+ Wh) to breathe easy and keep the battery in its happy 20–80% window overnight.

Continuous-Flow vs. Pulse-Dose: Sleep Is Non-Negotiable

This is the safety pivot most camping guides gloss over.

Pulse-dose concentrators detect breath and pulse oxygen during inhalation only. They’re efficient—pulling 30–100 watts per UDPOWER’s measured bands—but during sleep, breath-detection fails. The concentrator doesn’t know you’re asleep; it doesn’t fire. You get no oxygen.

Continuous-flow units run at a steady 100–350 watts (or higher, like our 374W example) regardless of breathing. No detection logic. No missed cycles. That’s why every overnight use case—whether you’re an RV lifer, a medical campground user, or a backcountry enthusiast on supplemental O2—requires continuous-flow.

OxygenConcentratorStore notes that portable dual-mode units offer both settings, but the moment you unroll your sleeping bag, you switch to continuous. Non-negotiable.

Runtime Table: Power Station vs. Concentrator Class

Based on UDPOWER’s real-world wattage survey and Sokol’s measured 374W at a 3 L/min continuous-flow setting, here’s what 8 hours of sleep actually costs you:

Concentrator Type	Typical Wattage	8-Hour Raw Draw	With 0.85 Efficiency	Practical Power Station Match
Portable 3L continuous	250–400W	2,000–3,200 Wh	2,350–3,760 Wh	EcoFlow Delta 2 Max (margin), EcoFlow Delta Pro (comfortable)
Portable 5L continuous	400–550W	3,200–4,400 Wh	3,760–5,180 Wh	EcoFlow Delta Pro (tight), Bluetti AC500 + expansion (comfortable)
Stationary 10L (if portable via inverter)	500–600W	4,000–4,800 Wh	4,700–5,650 Wh	Bluetti AC500 + expansion required

For the 374W unit in the table, you’re solidly in the “Delta Pro or bigger” camp.

Cold Weather and Altitude: Battery Math Gets Harder

Lithium batteries lose meaningful capacity in the cold—and the exact derate depends on chemistry (LFP holds up noticeably better than NMC) and how cold you’re going. Plan to measure runtime in the conditions you’ll actually camp in before trusting spec-sheet capacity overnight. A 3,600 Wh station at 5°C will not deliver 3,600 Wh.

High altitude compounds this: concentrators work harder at altitude because there’s less oxygen per breath of intake air; the unit pulls more current to deliver the same flow. Measure your draw at the elevation you’re camping. Don’t assume sea-level wattage.

The math: oversize for cold, oversize for altitude, then measure. Spec-sheet capacity is the ceiling, not the floor.

Backup-Battery Strategy: One Big Unit or Two Medium?

Two schools of thought:

Single Large Station — One EcoFlow Delta Pro (3,600 Wh) or Bluetti AC500 system (5,120+ Wh with expansion). Lighter footprint, no parallel charging complexity, one inverter to debug. Best for established campgrounds or RV parks with 240V shore power to recharge.

Dual Medium Stations — Two EcoFlow Delta 2 Max units (2,048 Wh each = 4,096 Wh combined) or two Anker SOLIX C1000 (1,024 Wh each). You run one battery at night, charge both during the day off solar or campground 120V. If one fails, you still have oxygen. Heavier and more cable management, but redundancy matters when oxygen is in the chain.

We’d pack one large station for a 2–3 night trip, dual mediums for rolling a week or more off-grid.

What We’d Actually Pack for an Overnight

• Power station: EcoFlow Delta Pro or larger, pre-charged to 90%.
• Inverter cable: 10-gauge, appropriate for the station’s max output, tested before the trip.
• Concentrator power cord: already fitted; no field swaps.
• Backup LFP battery: secondary 1,024+ Wh unit in the vehicle, charged, as a “we don’t run out of oxygen” insurance policy.
• Kill-o-Watt meter: one trip to measure YOUR specific unit’s draw under the conditions you’re camping (altitude, outdoor temperature, flow setting). Don’t assume 374W. Measure it. One hour, one meter, one number. Game over.

America’s Generators aligns on this philosophy: oversizing is cheap compared to the alternative.

The gap between a good camping trip and a medical emergency is usually in the planning margin you didn’t build. We build it. You measure. You pack bigger than the math says. And you sleep.

See also: CPAP power station overnight camping math, power station watt-hour framework for other loads, van-life power planning, cold-weather battery derating, continuous-draw load parallels.