EcoFlow DELTA 2 vs DELTA 3 vs DELTA 3 Plus (2026)

The EcoFlow DELTA 2 is discontinued, and the DELTA 3 (about $629) is its direct replacement: the same 1,024Wh LiFePO4 battery and 1,800W output, but surge rises from 2,700W to 3,600W, a full wall charge drops from 80 to 56 minutes, and the backup switchover falls from under 30ms to under 10ms. The DELTA 3 Plus (about $719) adds a second 500W solar input (1,000W total) and 140W USB-C ports, so buy the Plus if you recharge from solar and the DELTA 3 if you mostly charge from the wall.

Our picks are based on published specifications, pricing, warranty terms and owner reports. Specs come from EcoFlow's US product pages (the DELTA 2 from its archived page); runtimes are arithmetic shown below.

EcoFlow DELTA 3Buy at EcoFlowCheck price on Amazon

EcoFlow DELTA 2 vs DELTA 3 vs DELTA 3 Plus: spec comparison

Spec	DELTA 2 (discontinued)	DELTA 3	DELTA 3 Plus
Capacity	1,024Wh	1,024Wh	1,024Wh
Chemistry and cycle rating	LFP, 3,000 cycles to 80%	LFP, 4,000 cycles to 80%	LFP, 4,000 cycles to 80%
AC outlets	6	6	6
AC output / surge	1,800W / 2,700W	1,800W / 3,600W	1,800W / 3,600W
X-Boost (resistive loads)	2,200W	2,200W	2,200W
USB-A	4 (2 x 12W, 2 x 18W)	2 x 18W	2 (36W max)
USB-C	2 x 100W	2 x 100W	2 x 140W
12V outputs	Car socket 126W, 2 x DC5521	Car socket 126W, 2 x DC5521	Car socket 126W, 2 x DC5521
Wall charging	1,200W: 0-80% in 50 min, 0-100% in 80 min	1,500W: 0-100% in 56 min	1,500W: 0-100% in 56 min
Solar input	500W (11-60V)	500W (11-60V)	1,000W (2 x 500W, 11-60V)
Backup switchover	Under 30ms	Under 10ms	Under 10ms
Expansion	1 extra battery, up to 3,040Wh	1 to 5kWh	1 to 5kWh (via XT150 output cable)
Weight	27 lb	27.6 lb	27.6 lb
Dimensions	15.7 x 8.3 x 11 in	15.7 x 8.0 x 11.2 in	16 x 8.0 x 11 in
Warranty	5 years	5 years	5 years
Price (Oct 2026)	Discontinued (last $499 on sale)	About $629	About $719 (pre-order)

What changed from the DELTA 2 to the DELTA 3?

• Surge: 2,700W to 3,600W. That is headroom for compressor and motor starts (refrigerators, small pumps, power tools); the continuous rating is still 1,800W.
• Charging speed: the wall charger rises from 1,200W to 1,500W, and EcoFlow rates a full charge at 56 minutes instead of 80.
• Switchover: under 10ms instead of under 30ms. The DELTA 2's 30ms was fine for fridges, lights and routers, but some desktop PCs reboot on a gap that long. At under 10ms, desktops, NAS drives and CPAP machines generally ride through. Neither is a double-conversion online UPS.
• Cycle rating: 3,000 to 4,000 cycles to 80% capacity. At one cycle a day that is about 8 years versus about 11.
• Expansion: the DELTA 2 took one extra battery (up to 3,040Wh). The DELTA 3 goes to about 5kWh and accepts DELTA 3, DELTA 2, DELTA 2 Max and DELTA Pro 3 extra batteries, so a DELTA 2 owner's extra battery carries over.
• Fewer USB-A ports: the DELTA 2 had four; the DELTA 3 has two. Otherwise the port layout is the same.

What does the DELTA 3 Plus add over the DELTA 3?

For about $90 more, the DELTA 3 Plus doubles solar input to 1,000W across two inputs, upgrades both USB-C ports to 140W (enough for a 16-inch laptop at full speed), and adds faster USB-A. Capacity, AC output, surge, weight and wall-charging speed are the same. EcoFlow rates a full solar charge at 70 minutes with 2 x 500W of panels in good sun. If you never plan to use solar, the plain DELTA 3 gives you everything else.

EcoFlow DELTA 3 PlusBuy at EcoFlowCheck price on Amazon

How long will each one run a refrigerator?

All three hold 1,024Wh, so runtimes are identical. Usable energy is 1,024Wh x 0.85 = 870Wh after inverter losses; runtime (hours) = 870 / average load in watts.

The figures here use planning draws: a conservative 150W average for a full-size fridge (a new ENERGY STAR model averages closer to 63W, so expect longer runtimes) and a conservative 40W for a CPAP (ResMed's battery guide lists about 8 to 20W for an AirSense 10 with its humidifier off, measured through ResMed's 12V DC converter, so expect longer CPAP runtimes than shown, especially from a 12V outlet, and up to about 55W with the humidifier at its highest setting, or about 67W with a heated tube as well).

Load (average draw)	Runtime on any of the three
Full-size refrigerator (150W average)	5.8 hours
Mini fridge (60W)	14.5 hours
CPAP (40W)	21.8 hours
Wi-Fi router (10W)	87 hours
Laptop (60W)	14.5 hours
12V cooler (45W)	19.3 hours
5,000 BTU window AC (450W)	1.9 hours

How long does each take to charge from solar?

Portable panels typically deliver 70% to 80% of their rating, so a working estimate is hours = 1,024Wh / (panel watts x 0.75). The DELTA 2 and DELTA 3 top out at 500W of panels: about 2.7 hours of strong sun. The DELTA 3 Plus can take 1,000W of panels: about 1.4 hours. With a single 220W panel, all three need about 6.2 hours. Our guide to how many solar panels you need has the math for other setups.

Which should you buy?

• Home outage backup, charging from the wall: the DELTA 3. It has the same capacity and switchover as the Plus for about $90 less.
• Camping, van life or anything solar-first: the DELTA 3 Plus. The 1,000W solar input roughly halves solar recharge time, and the 140W USB-C ports charge laptops without the inverter.
• CPAP, desktop PC or home office: either DELTA 3 model. The under-10ms switchover is the reason to choose them over a used DELTA 2. See our best solar generators for CPAP.
• A used DELTA 2: only at a clear discount to a new DELTA 3, and only after checking the cycle count and battery health in the EcoFlow app. Our used solar generator checklist covers what to inspect.
• Need more than 1kWh: a full-size fridge lasts under 6 hours on any of these. Step up to the 2,048Wh DELTA 3 Max, or add an extra battery to a DELTA 3.

For full reviews, see the DELTA 3 review, the DELTA 3 Plus review and our older EcoFlow DELTA 2 review; the DELTA 3 series comparison covers the Classic, Max and Ultra too. For other picks in this size class, see our camping rankings.

EcoFlow DELTA 3Buy at EcoFlowCheck price on Amazon