EcoFlow DELTA Pro: Runtime & Specs

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

The EcoFlow DELTA Pro is a 3,600 Wh LiFePO4 power station with 3,600 W of continuous AC output and a 7,200 W surge rating. It runs a typical full-size fridge for about 2.2 days. It has been replaced or discontinued, but many are still in use.

Capacity3,600 WhLiFePO4

Output3,600 W7,200 W surge

Solar input1,600 W11–150 V

Weight99 lbexpands to 10,800 Wh

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Our notes

The DELTA Pro is built for the whole house rather than the campsite. At 99 lb it's meant to be wheeled, not carried, and its 3,600 Wh battery runs a typical fridge, a chest freezer and a Wi-Fi router together for about 30 hours on the spec-sheet math.

Two details are easy to miss. Its outlets are 120 V only, so on its own it can't run a 240 V well pump. And its fastest wall charging (3,000 W) needs a 240 V outlet such as a dryer or EV circuit. On a normal 120 V outlet it takes 1,800 W.

EcoFlow rates the battery for 3,500 cycles to 80% capacity (6,500 to 50%), one of the more detailed cycle-life claims in our database. The wide 11 to 150 V solar input lets you wire several panels in series, up to 1,600 W.

Add two extra batteries and you reach 10.8 kWh, close to four days for that fridge, freezer and router. It's no camping battery, though. EcoFlow's successor is the DELTA Pro 3, though the original is still sold.

Simulated runtimes (not measured)

Nobody tested this unit for this page. These figures come from a computer simulation of the DELTA Pro, 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 Pro
Device	Spec-sheet math	Simulated, typical	Likely range	Simulated at 0 °C
Wi-Fi router + modem	8.5 days	3 days	2.5 days to 3.9 days	2.6 days
CPAP (no humidifier)	4.3 days	2.2 days	46 hours to 2.7 days	45 hours
Starlink Standard	34 hours	27 hours	25 hours to 30 hours	23 hours
Refrigerator (full-size, ENERGY STAR)	2.2 days	37 hours	33 hours to 42 hours	31 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 30 W for this model, varied from 18 to 44 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 Pro. How we calculate · How we use AI

How long will the DELTA Pro 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 Pro
Device	Avg draw	Runtime
LED light bulb	9 W	14.2 days
Phone charging	10 W	13.5 days
Wi-Fi router + modem	15 W	8.5 days
Laptop	50 W	2.6 days
CPAP (no humidifier)	30 W	4.2 days
CPAP with heated humidifier	60 W	2.1 days
Starlink Standard	90 W	34 hours
TV	100 W	31 hours
Mini fridge	29 W	4.4 days
Refrigerator	58 W	2.2 days
Chest freezer	29 W	4.4 days
Sump pump (1/3 HP)	160 W	19 hours
Sump pump (1/2 HP)	210 W	15 hours
Window AC	225 W	14 hours
Drip coffee maker	1,000 W	3.1 hours
Microwave	1,500 W	2 hours
Space heater	750 W	4.1 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 Pro 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	48 hours
200 W of panels	150 W	24 hours
400 W of panels	300 W	12 hours
1,600 W of panels	1,200 W	3 hours

Check panel voltage and wiring with the solar charging calculator.

Full specifications

Battery capacity	3,600 Wh
Amp-hours at 12 V (converted) How we convert	300 Ah (281 Ah at 12.8 V)
Battery pack voltage	48 V (75 Ah at this voltage)
Battery chemistry LFP vs NMC	LiFePO4 (LFP)
Continuous AC output	3,600 W
Surge (peak) output	7,200 W
X-Boost (heating devices)	4,500 W
AC voltage	120V
AC outlets	5
USB-C ports	2 (up to 100 W)
USB-A ports	4
12 V car outlet	Yes
Max solar input	1,600 W
Solar voltage range	11–150 V
Solar max current	15 A
Max AC charging power	3,000 W
AC charging time (maker claim)	0–100% in 2.7 hr (as fast as 1.8 hr)
Expandable	Yes, up to 10,800 Wh
UPS / EPS switchover What this means	Not listed
Cycle life What this means	3,500 cycles (to 80%)
Weight	99 lb
Warranty	5 years

Notes: AC in 1800W @120V, 3000W @240V. Up to 2 DELTA Pro Smart Extra Batteries (10.8kWh). Cycles: 3500 to 80%, 6500 to 50%. Still sold; succeeded by DELTA Pro 3. EPS time not listed.

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 Pro run a refrigerator?

About 2.2 days 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 Pro run a microwave?

Yes. A typical 1,000 W microwave pulls about 1,500 W from the outlet, within its 3,600 W continuous output. A full battery gives about 2 hours of cooking.

How many amp-hours is the EcoFlow DELTA Pro?

The EcoFlow DELTA Pro works out to about 300 Ah at 12 V, or 281 Ah at 12.8 V, the nominal voltage of a 12 V LiFePO4 battery. Both are our conversion of EcoFlow's 3,600 Wh rating: amp-hours = watt-hours ÷ volts. EcoFlow's manual gives the capacity as 3,600 Wh at 48 V, which works out to 75 Ah at the pack's own voltage. For scale, a 12 V 100 Ah LiFePO4 battery holds 1,280 Wh, so this model holds about as much as 2.8 of them. How we convert amp-hours.

How long does the EcoFlow DELTA Pro take to charge?

EcoFlow's published charging claim: “0–100% in 2.7 hr (as fast as 1.8 hr)”. Max AC charging power is 3,000 W. With solar, it accepts up to 1,600 W. With 1,600 W of panels that's roughly 3 hours of good sun from empty.

Is the EcoFlow DELTA Pro expandable?

Yes, up to 10,800 Wh with EcoFlow's extra batteries.