EcoFlow DELTA 2 vs DELTA 3: Classic, Plus and Max compared

The DELTA 3 is the newer model. It is not a bigger battery, though. Both the DELTA 2 and the DELTA 3 hold 1,024 Wh and list 1,800 W of AC output, so on a fridge or a CPAP they run the same number of hours. The changes are in surge, cycle life, charging speed and switchover time.

We compared these from EcoFlow's own spec pages; we haven't tested them. Figures were checked on October 29, 2026. EcoFlow changes specs and bundles often, so confirm on the listing before you buy.

DELTA 2 vs DELTA 3: what is different?

Spec	DELTA 2	DELTA 3
Battery	1,024 Wh	1,024 Wh
AC output (continuous)	1,800 W	1,800 W
Surge	2,700 W	3,600 W
X-Boost (max device power)	2,200 W	2,200 W
AC outlets	6	6
Battery type	LFP (LiFePO4)	LFP (LiFePO4)
Cycle rating	3,000 cycles to 80%+	4,000 cycles to 80%+
AC charging	1,200 W max	1,500 W
Max solar input	500 W	500 W
UPS switchover	Not listed on the page we checked	Under 10 ms
Noise (maker's figure)	Not listed	Under 30 dB at 600 W
Weight	27 lb	27.6 lb
Warranty	See the listing	5 years (3 + 2 on app registration)

The DELTA 2 column comes from EcoFlow's Canadian product page. EcoFlow's US page for the DELTA 2 now sends you to the DELTA 3 page, so the original may only be available from remaining stock or resellers. EcoFlow's US DELTA 3 page also uses the "DELTA 3 Plus" name in its footnotes and a bundle listing, so the two names appear to refer to the same 1,024 Wh model. Check the exact title on the listing.

What it means in practice

• Run time: identical. Hours = Wh × 0.85 ÷ watts. A fridge averaging about 52 W runs roughly 17 hours on either (1,024 × 0.85 ÷ 52).
• Starting motors: the DELTA 3's higher surge (3,600 W) gives more room for a fridge compressor, a pump or a power tool. The DELTA 2's 2,700 W covers most small motors too. See can a power station run a refrigerator.
• Battery life: 4,000 cycles vs 3,000. EcoFlow rates both to 80% or more of original capacity, so the two numbers are comparable.
• Charging: 1,500 W vs 1,200 W from the wall. Solar input is the same 500 W cap. See how long a power station takes to charge.
• Computers and CPAP: EcoFlow lists the DELTA 3's switchover as under 10 ms for keeping a NAS or server up. We did not find a switchover time on the DELTA 2 page, so don't count on it as a UPS.

Which is better, DELTA 2 or DELTA 3?

Choose the DELTA 3 if the listings are close in price. It has the better surge, cycle and charging numbers at the same size and almost the same weight.

Choose the DELTA 2 only if you find it listed clearly cheaper and you don't need a UPS function. For a fridge, lights, a router and phones, you will not notice the difference in an outage.

DELTA 3 Classic, Plus and Max: which is which?

EcoFlow sells several DELTA 3 models, and the names are easy to mix up:

Model	Battery	AC output	Surge	Notes from EcoFlow's page
DELTA 3 (also called Plus)	1,024 Wh	1,800 W	3,600 W	4,000 cycles, 1,500 W AC charging, expandable up to 5 kWh
DELTA 3 Classic	1,024 Wh	1,800 W	3,600 W	2,600 W X-Boost, 1,400 W AC input, 0-80% in 45 min, 12.1 kg + 0.3 kg
DELTA 3 Max	2,048 Wh	2,400 W	4,800 W	68 min to 80%, 20.3 kg
DELTA 3 Max Plus	2,048 Wh	3,000 W	6,000 W	Expandable 2 to 10 kWh, 43 min to 80% on generator charging

DELTA 3 Classic vs DELTA 3: the Classic page lists the same 1,024 Wh, 1,800 W and 3,600 W, but a higher X-Boost figure (2,600 W vs 2,200 W) and slightly lower AC input (1,400 W vs 1,500 W). It lists a 10 ms UPS. We did not find a cycle rating on the Classic page, so compare that line on the listing before you decide.

DELTA 3 Max and Max Plus: these are the 2 kWh step up. Pick the Max Plus if you want 3,000 W and room to add batteries; the Max if 2,400 W is enough.

DELTA 2 Max vs DELTA 3 Max

The DELTA 2 Max also lists 2,048 Wh, 2,400 W and 4,800 W surge, with 3,000 cycles to 80%+ and up to 1,000 W of solar (two ports). EcoFlow lists it at 50 lb. The DELTA 3 Max is listed at 20.3 kg (about 45 lb), which EcoFlow calls 13% lighter than the previous 2 kWh unit, and adds a 10 ms UPS. Same trade-off as the smaller pair: similar size, newer model with the better extras.

Quick buying checklist

1. Match the exact name. "DELTA 2", "DELTA 2 Max", "DELTA 3", "DELTA 3 Classic", "DELTA 3 Max" and "DELTA 3 Max Plus" are all different products.
2. Add up your watts and check them against continuous output and surge.
3. Check what is in the box. Many listings bundle panels or extra batteries.
4. Check the warranty length on the listing and whether registration is needed.

Where to buy

• EcoFlow DELTA 3 on Amazon
• EcoFlow DELTA 3 Classic on Amazon
• EcoFlow DELTA 2 on Amazon
• EcoFlow DELTA 3 Max Plus on Amazon

Comparing brands instead of generations? See EcoFlow vs Jackery and the 1 kWh Jackery vs Anker vs BLUETTI page. Sizing for a house? Read power stations for home backup.

Frequently asked questions

Is the EcoFlow DELTA 3 better than the DELTA 2?

On EcoFlow's pages, yes on most numbers: higher surge, longer cycle rating and faster AC charging at the same 1,024 Wh and 1,800 W.

How many hours does a 1,024 Wh station run a fridge?

About 17 hours for a fridge averaging 52 W, using the 0.85 loss factor. Real runtime varies with the fridge and room.

Can a DELTA 3 or DELTA 2 run a space heater?

A 1,500 W heater would drain 1,024 Wh in well under an hour. Use small heated blankets instead.

Is the DELTA 3 Plus the same as the DELTA 3?

EcoFlow's US DELTA 3 page uses the Plus name in its footnotes and in a bundle listing, with the same 1,024 Wh and 1,800 W specs. Check the exact title on the listing.

If you recharge from a gas generator, run it outdoors only, 20+ feet from the house, away from windows and doors. Read our carbon monoxide guide.