EcoFlow DELTA 3 Max

Q: How many nights will the EcoFlow DELTA 3 Max run a CPAP?

A ResMed AirSense 11 at its typical 56 W runs about 23 hours on AC power: 2.8 nights of 8 hours. ResMed's typical figure includes its humidifier; a higher humidifier or heated-tube setting raises the draw. Running the CPAP from the 12 V socket with ResMed's DC converter avoids the inverter's own draw.

Q: How long does the EcoFlow DELTA 3 Max take to charge?

EcoFlow states 0-80% in 68 min from a wall outlet, and up to 500 W of solar input.

Q: Can you add batteries to the EcoFlow DELTA 3 Max?

No. EcoFlow says it does not take extra batteries, so 2,048 Wh is the most it holds.

The DELTA 3 Max is a 2,048 Wh, 2,400 W EcoFlow station at 44.8 lb with four 20 A AC outlets and a 12 V car socket. It suits home backup for a refrigerator and a sump pump when you will not need more battery later, because it takes no expansion battery.

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EcoFlow, 1,500 to 2,599 Wh

2,048Wh

2,400 WAC output, 4,800 W peak

1,679 Whusable at 82%

44.8 lbweight

0-80% in 68 minwall recharge

A refrigerator, router and lights through a day without power; RV weekends.

Strengths

2,400 W continuous, 4,800 W surge and 3,400 W X-Boost: runs a 1,875 W hair dryer about 53 minutes, or a 1,800 W induction cooktop about 55 minutes.
2,048 Wh runs a 21 cu ft top-freezer refrigerator about 26 hours, or a 1/2 HP sump pump (2,645 W start-up) about 1.8 hours (sizing for a sump pump).
44.8 lb: lighter than the DJI Power 2000 and FOSSiBOT F2400 (48.5 lb each) at the same 2,048 Wh, though heavier than the Anker SOLIX C2000 Gen 2 (41.7 lb).
12 V car socket (126 W), which the DJI Power 2000 lacks: runs a Dometic CFX3 35 cooler about 5.9 days.
0-80% in 68 minutes from the wall at 1,800 W, and EcoFlow rates it at 25 dB or less at 600 W.

Limits

No expansion battery; the Anker SOLIX C2000 Gen 2 expands to 4,096 Wh and the DJI Power 2000 to 22,528 Wh.
500 W solar input, against 800 W on the Anker SOLIX C2000 Gen 2 and 1,800 W on the DJI Power 2000.
EcoFlow states no cycle-life figure for it, and its 5-year warranty is 3 years standard plus 2 more once you register.
Cannot start a Dometic Brisk II 13,500 BTU RV air conditioner: its 7,820 W start-up is above the 4,800 W surge.

Prices today

Where	Price	Per Wh	Stock	Checked
us.ecoflow.com	$899store's "compare at" price $1,199	$0.44	In stock	Oct 28, 2026, 22:59 UTC	Store
Amazon	$899	$0.44	In stock	Oct 28, 2026, 22:58 UTC	Amazon

Product prices and availability are accurate as of the date/time indicated and are subject to change.

Price history

Price tracking for this model started Oct 28, 2026. The store and Amazon prices are recorded twice a day; the chart appears once there are a few days of readings.

What the DELTA 3 Max runs

Runtimes for one appliance at a time, from each appliance maker's own figure. They count 82% of the 2,048 Wh battery as usable and add 18 W for the inverter on AC loads (the method). For a mix of appliances, use the sizing tool.

Appliance	Draw	DELTA 3 Max
Refrigerator, top freezer (21 cu ft)Whirlpool WRT541SZD (21.3 cu ft top freezer; ENERGY STAR model WRT541SZD0, no ice maker installed)	46 W	26 hours
Chest freezer (7 cu ft)Midea MRC07M7AWW (7.0 cu ft compact chest freezer, manual defrost)	26 W	38 hours
CPAP (ResMed AirSense 11)ResMed AirSense 11 (AutoSet / Elite / CPAP) with 65 W power supply unit, HumidAir 11 humidifier	56 W	23 hours
Wi-Fi router (eero 6+)eero 6+ (Amazon eero)	5 W	3.1 days
55-inch TVLG 55UT7570PUB (UT75 series)	127 W	12 hours
Starlink StandardStarlink Standard kit (Starlink V4 dish + Router 3; US spec page titled 'Standard 4X')	100 W	14 hours
Gas furnace blower (80,000 BTU)Goodman GR9S960803BN (80,000 BTU/h input, 95% AFUE, single-stage, 1/2 HP 9-speed ECM circulator blower)	394 W	4.1 hours
12 V cooler (Dometic CFX3 35)Dometic CFX3 35 (CFX335, item 9600024617)	12 W	5.9 days
1/3 HP sump pumpLiberty Pumps 257 (1/3 HP, 115 V, cast iron, vertical magnetic float switch; PSC motor)	598 W	2.7 hours
Window AC, 5,000 BTUFrigidaire FHWC054TE1 (5,000 BTU, 115 V, R-32)	450 W	3.6 hours
Phone chargesSamsung Galaxy S25, 4,000 mAh	15 Wh	109 full charges
Laptop charges (MacBook Air 13)Apple MacBook Air 13-inch (M5)	54 Wh	31 full charges
E-bike battery chargesRad Power Bikes RadRunner Plus (MY2025), Safe Shield Advanced External Battery 13 Ah	624 Wh	2 full charges

As of October 28, 2026, EcoFlow's US warranty policy gives the DELTA 3 Max 3 years of standard warranty plus 2 more with registration, 5 years in all, so register the station after you buy it (EcoFlow's warranty policy). EcoFlow states only the 0-80% wall recharge time (68 minutes) and gives no time for a full charge.

Specifications

Every figure is EcoFlow's own, from the page linked beside it.

Capacity	2,048 Whsource: "Rated Capacity 2048Wh 51.2V 40Ah"
AC output, continuous	2,400 Wsource: "AC Output 120V 60Hz 2400W total, 20A (x4) Max per port"
AC output, peak	4,800 Wsource: "2400W Powerful Output: 4800W surge output."
Boost mode	3,400 Wsource: "X-Boost 3400W"
AC outlets	4source: "120V 60Hz 2400W total, 20A (x4) Max per port"
Fastest USB-C port	100 Wsource: "USB-C (x1): 5/9/12/15V-3A,20V--5A, 100W Max"
USB-C ports	3source: "USB-C (x1) ... 100W Max USB-C (x2) ... 30W Max per port". 1 x 100W USB-C + 2 x 30W USB-C = 3 USB-C ports
USB-A ports	1source: "USB-A (x1): 5V-3A/9V-2A/12V-1.5A, 18W Max"
12 V car socket	Yessource: "Cigarette Lighter Output Port 12.6V, 10A, 126W Max"
Battery chemistry	LiFePO4source: "Cell Chemistry LFP (LiFePO4)"
Weight (lb)	44.8 lbsource: "Net. Weight Approx. 20.3 kg (44.8 lbs)"
Weight (kg)	20.3 kgsource: "Net Weight 20.3+0.4kg"
Size	19.4 x 9.4 x 12.0 insource: "Approx. 494 × 239 × 305 mm (19.4 × 9.4 × 12.0 in)"
Wall recharge	0-80% in 68 min with 1800W AC input (X-Stream); 100% time not statedsource: "1800W Input, 0-80% in 68 mins"
Wall charging input	1,800 Wsource: "1800W Input, 0-80% in 68 mins"
Max solar input	500 Wsource: "Maximum PV Input Power(W) 500W"
UPS switchover	Under 10 mssource: "UPS <10ms"
Expandable	Nosource: "DELTA 3 Max features an XT60 port only, making these functions unavailable."
Warranty	5 yearssource: "5-Year Warranty *Includes 3-year standard warranty and 2-year extended warranty"
App	Yessource: "OASIS 3.0 Smart App Control"
Noise	≤25 dB at 600Wsource: "25dB Whisper-Quiet Operation: Ultra-low noise (≤25dB at 600W)."
Certifications	EMC Class Bsource: "EMC Class B"

Against other 1,500 to 2,599 wh models

Spec	EcoFlow DELTA 3 Max	Jackery Explorer 1500 v2	Jackery Explorer 2000 v2	Anker SOLIX C2000 Gen 2
Price today (lowest)	$899	$849	$999	$899.98
Price per Wh	$0.44/Wh	$0.55/Wh	$0.49/Wh	$0.44/Wh
Capacity	2,048 Wh	1,536 Wh	2,042 Wh	2,048 Wh
AC output, continuous	2,400 W	2,000 W	2,200 W	2,400 W
AC output, peak	4,800 W	4,000 W	4,400 W	4,000 W
AC outlets	4	3	3	6
Fastest USB-C port	100 W	100 W	100 W	140 W
12 V car socket	Yes	Yes	Yes	Yes
Battery	LiFePO4	LiFePO4	LiFePO4	LFP
Cycle life	Not stated	6000 cycles to 70%+ capacity	4000 cycles to 70%+ capacity	4,000 cycles to 80%
Weight	44.8 lb	31.97 lb	39.5 lb	41.7 lb
Wall recharge	0-80% in 68 min	64 min to full	102 min to full	88 min to full
Max solar input	500 W	400 W	400 W	800 W
UPS switchover	Under 10 ms	Under 10 ms	Under 20 ms	Under 10 ms
Expandable to	Not expandable	Not expandable	Not expandable	4,096 Wh
Warranty	5 years	5 years	5 years	5 years
App	Yes	Yes	Yes	Yes