EcoFlow DELTA 3: Runtime & Specs

By Hicham M. · Specs from EcoFlow's published documents, as of September 2026 · How we calculate

The EcoFlow DELTA 3 is a 1,024 Wh LiFePO4 power station with 1,800 W of continuous AC output and a 3,600 W surge rating. It runs a typical full-size fridge for about 15 hours.

Capacity1,024 WhLiFePO4

Output1,800 W3,600 W surge

Solar input500 W11–60 V

Weight27.6 lbexpands to 5,120 Wh

Check price on Amazon View at EcoFlow Calculate runtime for your devices

We may earn a commission if you buy through these links. It never changes our numbers, and every model in our database is included whether or not it pays us. Learn more.

Our notes

The DELTA 3 and the DELTA 3 Plus share the same 1,024 Wh battery, 1,800 W output, 3,600 W surge, 27.6 lb weight and 10 ms UPS switchover. The differences are solar and USB-C: the Plus takes 1,000 W of solar through two inputs and has a 140 W USB-C port, while the DELTA 3 takes 500 W through one input and tops out at 100 W USB-C. If you won't use more than 500 W of panels, the Plus's extras don't buy you any more backup.

Next to other 1 kWh models, its 3,600 W surge stands out. The Anker SOLIX C1000, for example, is rated 2,400 W. Fridges and freezers draw several times their running power for a moment when they start, and sump pumps about double, so the extra headroom matters for those.

The 10 ms switchover is fast enough for most routers and desktop computers. A typical full-size fridge runs about 15 hours on the battery alone. It expands to 5,120 Wh with EcoFlow's extra batteries, which turns it into a multi-day setup.

Simulated runtimes (not measured)

Nobody tested this unit for this page. These figures come from a computer simulation of the DELTA 3, and they are estimates. The plain runtime table below divides energy by average draw at 85% efficiency. The simulation also charges the battery for the power the inverter burns just by being switched on, which is why small loads come out shorter. Where we have measured a unit, the measurement is shown separately and labeled as measured.

Simulated runtimes for the EcoFlow DELTA 3
Device	Spec-sheet math	Simulated, typical	Likely range	Simulated at 0 °C
Wi-Fi router + modem	2.4 days	28 hours	24 hours to 34 hours	24 hours
CPAP (no humidifier)	29 hours	19 hours	17 hours to 22 hours	16 hours
Starlink Standard	9.7 hours	8.5 hours	8 hours to 9 hours	7.2 hours
Refrigerator (full-size, ENERGY STAR)	15 hours	12 hours	11 hours to 13 hours	10 hours

Nonstop runtime from full to battery cutoff. Likely range = middle 80% of 200 simulated runs with the uncertain inputs varied. The inverter idle draw is assumed, not published: we assumed about 19 W for this model, varied from 11 to 28 W. If the real figure is lower, real runtimes land closer to the spec-sheet column.

How this was simulated

The battery is stepped down every 2 minutes until it reaches cutoff, for 200 runs per device. Results are seeded, so the page shows the same numbers on every build.
Battery draw = load + inverter idle draw + 4–8% of the load + a loss that rises with load squared (4% at full output).
Usable capacity = 92–98% of rated Wh, for protection cutoff and aging.
At 0 °C, 80–90% of that capacity is assumed available.
Fridges cycle on and off every 30–50 minutes at the share of the time set by their average draw. The inverter idle draw continues while the compressor is off.
Devices that exceed this model's output or surge rating are left out. Loads are US 120 V devices.

These ranges are assumptions about a typical unit. They are not manufacturer figures for the EcoFlow DELTA 3. How we calculate · How we use AI

How long will the DELTA 3 run your appliances?

Nonstop runtime for one device at a time, using typical US wattages and 85% inverter efficiency. Devices marked ✕ can't run on this model.

Estimated runtime by appliance for the EcoFlow DELTA 3
Device	Avg draw	Runtime
LED light bulb	9 W	4 days
Phone charging	10 W	3.8 days
Wi-Fi router + modem	15 W	2.4 days
Laptop	50 W	17 hours
CPAP (no humidifier)	30 W	29 hours
CPAP with heated humidifier	60 W	15 hours
Starlink Standard	90 W	9.7 hours
TV	100 W	8.7 hours
Mini fridge	29 W	30 hours
Refrigerator	58 W	15 hours
Chest freezer	29 W	30 hours
Sump pump (1/3 HP)	160 W	5.4 hours
Sump pump (1/2 HP)	210 W	4.1 hours
Window AC	225 W	3.9 hours
Drip coffee maker	1,000 W	52 min
Microwave	1,500 W	35 min
Space heater	750 W	1.2 hours
Well pump	33 W	Needs 240 V

Fridges, freezers, pumps and AC units cycle on and off, so we use their average draw. Want a mix of devices on a schedule? Use the runtime calculator.

What the DELTA 3 can't power

Well pump (1/2 HP submersible): needs 240 V

Solar charging time

Hours of good sun to charge from empty, assuming panels deliver 75% of their rating.

Panels	Power in	Hours of sun
100 W of panels	75 W	14 hours
200 W of panels	150 W	6.8 hours
400 W of panels	300 W	3.4 hours
500 W of panels	375 W	2.7 hours

Check panel voltage and wiring with the solar charging calculator.

Full specifications

Battery capacity	1,024 Wh
Amp-hours at 12 V (converted) How we convert	85.3 Ah (80 Ah at 12.8 V)
Battery pack voltage	51.2 V (20 Ah at this voltage)
Battery chemistry LFP vs NMC	LiFePO4 (LFP)
Continuous AC output	1,800 W
Surge (peak) output	3,600 W
X-Boost (heating devices)	2,200 W
AC voltage	120V
AC outlets	6
USB-C ports	2 (up to 100 W)
USB-A ports	2
12 V car outlet	Yes
Max solar input	500 W
Solar voltage range	11–60 V
Solar max current	15 A
Max AC charging power	1,500 W
AC charging time (maker claim)	0–100% in 56 min
Expandable	Yes, up to 5,120 Wh
UPS / EPS switchover What this means	10 ms
Cycle life What this means	4,000 cycles (to 80%)
Weight	27.6 lb
Warranty	5 years

Notes: EcoFlow: 1–5kWh w/ DELTA 3/DELTA 2/DELTA 2 Max/DELTA Pro 3 EB; 5120 = 1024 + 4096Wh DP3 EB. X-Boost: US spec 2200W; manual table shows 2600W at 120V.

Specs from EcoFlow's published documents, as of September 2026. Found an error? Tell us.

Sources

Similar power stations

Questions

How long will the EcoFlow DELTA 3 run a refrigerator?

About 15 hours for a typical ENERGY STAR full-size fridge averaging 58 W, assuming 85% inverter efficiency. Older or larger fridges use more. Try your own numbers.

Can the EcoFlow DELTA 3 run a microwave?

Yes. A typical 1,000 W microwave pulls about 1,500 W from the outlet, within its 1,800 W continuous output. A full battery gives about 35 min of cooking.

How many amp-hours is the EcoFlow DELTA 3?

The EcoFlow DELTA 3 works out to about 85.3 Ah at 12 V, or 80 Ah at 12.8 V, the nominal voltage of a 12 V LiFePO4 battery. Both are our conversion of EcoFlow's 1,024 Wh rating: amp-hours = watt-hours ÷ volts. EcoFlow's manual lists the battery itself as 20 Ah at 51.2 V, the same energy at a higher voltage. For scale, a 12 V 100 Ah LiFePO4 battery holds 1,280 Wh, so this model holds about 80% as much as one. How we convert amp-hours.

How long does the EcoFlow DELTA 3 take to charge?

EcoFlow's published charging claim: “0–100% in 56 min”. Max AC charging power is 1,500 W. With solar, it accepts up to 500 W. With 500 W of panels that's roughly 2.7 hours of good sun from empty.

Is the EcoFlow DELTA 3 expandable?

Yes, up to 5,120 Wh with EcoFlow's extra batteries.

Does the EcoFlow DELTA 3 work as a UPS?

EcoFlow lists a 10 ms switchover time, so it can keep devices like routers and computers running when the power drops. Check that your specific device tolerates the switch before relying on it for anything critical.