EcoFlow DELTA 2 Max: Runtime & Specs

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

The EcoFlow DELTA 2 Max is a 2,048 Wh LiFePO4 power station with 2,400 W of continuous AC output and a 4,800 W surge rating. It runs a typical full-size fridge for about 30 hours. It has been replaced or discontinued, but many are still in use.

Capacity2,048 WhLiFePO4

Output2,400 W4,800 W surge

Solar input1,000 W11–60 V

Weight50 lbexpands to 6,144 Wh

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Our notes

The DELTA 2 Max is now sold out at EcoFlow US and replaced by the DELTA 3 Max, but the older model still beats it on a few things that matter for home backup. It takes 1,000 W of solar (two 500 W inputs) against the DELTA 3 Max's 500 W. It also expands to 6,144 Wh with two extra batteries, while the DELTA 3 Max can't be expanded at all, and it has six AC outlets against four.

The DELTA 3 Max answers with a lighter body (44.8 lb against 50 lb) and a listed 10 ms UPS switchover. EcoFlow doesn't publish a switchover time for the DELTA 2 Max, so don't count on it to keep a desktop computer from rebooting when the power drops.

A refurbished unit is a good way into a system you can grow later. On its own it keeps a typical fridge going for about 30 hours.

Simulated runtimes (not measured)

Nobody tested this unit for this page. These figures come from a computer simulation of the DELTA 2 Max, 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 2 Max
Device	Spec-sheet math	Simulated, typical	Likely range	Simulated at 0 °C
Wi-Fi router + modem	4.8 days	2 days	41 hours to 2.6 days	41 hours
CPAP (no humidifier)	2.4 days	35 hours	30 hours to 41 hours	30 hours
Starlink Standard	19 hours	16 hours	15 hours to 18 hours	14 hours
Refrigerator (full-size, ENERGY STAR)	30 hours	23 hours	21 hours to 25 hours	19 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 22 W for this model, varied from 13 to 34 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 2 Max. How we calculate · How we use AI

How long will the DELTA 2 Max 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 2 Max
Device	Avg draw	Runtime
LED light bulb	9 W	8.1 days
Phone charging	10 W	7.7 days
Wi-Fi router + modem	15 W	4.8 days
Laptop	50 W	35 hours
CPAP (no humidifier)	30 W	2.4 days
CPAP with heated humidifier	60 W	29 hours
Starlink Standard	90 W	19 hours
TV	100 W	17 hours
Mini fridge	29 W	2.5 days
Refrigerator	58 W	30 hours
Chest freezer	29 W	2.5 days
Sump pump (1/3 HP)	160 W	11 hours
Sump pump (1/2 HP)	210 W	8.3 hours
Window AC	225 W	7.7 hours
Drip coffee maker	1,000 W	1.7 hours
Microwave	1,500 W	1.2 hours
Space heater	750 W	2.3 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.

The DELTA 2 Max in action

EcoFlow's own video, so expect a sales pitch. It loads from YouTube only when you press play.

**EcoFlow DELTA 2 Max**Official video from EcoFlow, plays from YouTube

What the DELTA 2 Max 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 and one array per 500 W solar input.

Panels	Power in	Hours of sun
100 W of panels	75 W	27 hours
200 W of panels	150 W	14 hours
400 W of panels	300 W	6.8 hours
500 W of panels	375 W	5.5 hours
1,000 W of panels (split across inputs)	750 W	2.7 hours

Check panel voltage and wiring with the solar charging calculator.

Full specifications

Battery capacity	2,048 Wh
Amp-hours at 12 V (converted) How we convert	171 Ah (160 Ah at 12.8 V)
Battery chemistry LFP vs NMC	LiFePO4 (LFP)
Continuous AC output	2,400 W
Surge (peak) output	4,800 W
X-Boost (heating devices)	3,400 W
AC voltage	120V
AC outlets	6
USB-C ports	2 (up to 100 W)
USB-A ports	4
12 V car outlet	Yes
Max solar input	1,000 W (500 W per input)
Solar voltage range	11–60 V
Solar max current	15 A
Max AC charging power	1,800 W
AC charging time (maker claim)	0–80% in 1.1 hr
Expandable	Yes, up to 6,144 Wh
UPS / EPS switchover What this means	Not listed
Cycle life What this means	3,000 cycles
Weight	50 lb
Warranty	5 years

Notes: Up to 2 DELTA 2 Max Smart Extra Batteries (6,144Wh). Sold out/pre-order on EcoFlow US; succeeded by DELTA 3 Max. 43-min 0–80% claim is AC+solar. 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 2 Max run a refrigerator?

About 30 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 2 Max run a microwave?

Yes. A typical 1,000 W microwave pulls about 1,500 W from the outlet, within its 2,400 W continuous output. A full battery gives about 1.2 hours of cooking.

How many amp-hours is the EcoFlow DELTA 2 Max?

The EcoFlow DELTA 2 Max works out to about 171 Ah at 12 V, or 160 Ah at 12.8 V, the nominal voltage of a 12 V LiFePO4 battery. Both are our conversion of EcoFlow's 2,048 Wh rating: amp-hours = watt-hours ÷ volts. The battery inside may run at a different voltage, so an amp-hour figure in a manual or on a product listing can look very different for the same energy. For scale, a 12 V 100 Ah LiFePO4 battery holds 1,280 Wh, so this model holds about as much as 1.6 of them. How we convert amp-hours.

How long does the EcoFlow DELTA 2 Max take to charge?

EcoFlow's published charging claim: “0–80% in 1.1 hr”. Max AC charging power is 1,800 W. With solar, it accepts up to 1,000 W (500 W per input). With 1,000 W of panels that's roughly 2.7 hours of good sun from empty.

Is the EcoFlow DELTA 2 Max expandable?

Yes, up to 6,144 Wh with EcoFlow's extra batteries.