Buying Decision · Updated October 31, 2026

Which EcoFlow Delta Should I Buy?

For most people, the Delta 3 Plus. It has 1 kWh, 1,000W of solar input and an expansion port at about half the weight of the 2 kWh models. If you need 2 kWh, the choice is between two stations with the same capacity and output: the older Delta 2 Max takes twice the solar and expands to 6 kWh, while the newer Delta 3 Max is lighter with a faster UPS but cannot be expanded. For 240V whole-home backup, the Delta Pro 3. One trap: the Delta 3 Max and Delta 3 Max Plus are different stations.

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By Jordan Park Reviewed & approved by Juhi Sahni | Updated: October 31, 2026

EcoFlow Delta Comparison: The Decision Table

Spec	Delta 3 Plus	Delta 3 Max	Delta 2 Max	Delta Pro 3
Capacity	1,024 Wh	2,048 Wh	2,048 Wh	4,096 Wh
Continuous AC output	1,800W	2,400W	2,400W	4,000W
Surge	2,400W	4,800W	4,800W	8,000W
Max solar input	1,000W (two inputs)	500W (one input)	1,000W (two inputs)	2,600W (combined)
Expandable	Yes, extra batteries	No	Yes, to 6,144 Wh	Yes, to 12 kWh per unit
240V output	No	No	No	Yes, 120/240V
Weight	26 lb	45 lb	50 lb	113.5 lb
Our rating	89/100	85/100	85/100	95/100
Full review	Review →	Review →	Review →	Review →
Price now	$719.00	Check price at Amazon →	Check price at Amazon →	$2,799.00

Capacity, output, solar, weight and ratings come from our product database. Expansion figures are from EcoFlow's published specs as reported in our individual reviews. Ratings are synthesized from published specs, logged Amazon prices and public reviews — see how we score.

Which Delta Fits You?

Delta 3 Plus

You camp, travel or want fridge-and-router backup in a unit one person can carry, with room to add a battery later.

Delta 2 Max

You want 2 kWh, plan to charge from up to 1,000W of solar, or may expand toward 6 kWh. Best when its price is at or below the Delta 3 Max.

Delta 3 Max

You want 2 kWh charged mostly from the wall, a lighter and quieter box, and a sub-10 ms UPS switchover for a desktop or network gear.

Delta Pro 3

You need 240V circuits, a transfer switch, a well pump or multi-day backup, and the budget and floor space for a wheeled flagship.

Delta 3 Max vs Delta 3 Max Plus: Don't Buy the Wrong One

EcoFlow launched both in late September and both hold 2,048 Wh, so listings blur together. The base Delta 3 Max (the one in the table above) has 2,400W output, one 500W solar input and no expansion port. The Delta 3 Max Plus has 3,000W output (6,000W surge), two solar inputs totalling 1,000W and support for extra batteries, per StorageReview. ESS News and The Solar Lab both confirm the base model cannot add batteries. If a listing says 3,000W or "expandable," it is the Max Plus.

We do not yet rate the Max Plus, so it has no price link here. On paper it is the true successor to the Delta 2 Max; the base Delta 3 Max is a cheaper, simpler sibling.

EcoFlow Delta 2 Max vs Delta 3 Max: Why the Older One Can Be the Better Buy

Both store 2,048 Wh and run 2,400W continuously with a 4,800W surge rating. The older Delta 2 Max takes 1,000W of solar against 500W, has six AC outlets against four, and expands to 6,144 Wh while the Delta 3 Max cannot expand at all. The Delta 3 Max answers with a lighter body (45 lb vs 50 lb), quieter running and a faster UPS switchover (advertised under 10 ms vs 30 ms). In our scoring they tie at 85/100, so let price and your charging habits decide.

Full breakdowns: Delta 2 Max review and Delta 3 Max review. To compare both against Anker, Jackery and Bluetti 2 kWh stations, see the best 2000Wh solar generators.

How Long Each Delta Runs Common Loads

Continuous-draw estimates from base capacity × 0.85 ÷ load watts (about 15% lost to conversion). Expansion batteries extend these on every model except the Delta 3 Max.

Load	Delta 3 Plus	Delta 3 Max	Delta 2 Max	Delta Pro 3
CPAP without humidifier (~40W)	~21.8 hrs	~43.5 hrs	~43.5 hrs	~87.0 hrs
Home office: laptop, monitor, router (~120W)	~7.3 hrs	~14.5 hrs	~14.5 hrs	~29.0 hrs
Full-size fridge (average while cycling) (~150W)	~5.8 hrs	~11.6 hrs	~11.6 hrs	~23.2 hrs
Fridge + router + lights (~250W)	~3.5 hrs	~7.0 hrs	~7.0 hrs	~13.9 hrs
Window AC unit (running) (~500W)	~1.7 hrs	~3.5 hrs	~3.5 hrs	~7.0 hrs

For outage planning, see the home backup guide; for 240V circuits, our transfer switch guide.

Also in the Delta Lineup

EcoFlow sells more Delta models than the four we rate. We have not scored these yet, so they are listed for context only, without price links.

Delta 3 (base) vs Delta 3 Plus: retailer spec sheets list the same 1,024 Wh capacity and 1,800W output for both. The main difference is solar: the base Delta 3 has a single 500W solar input, while the Delta 3 Plus takes 1,000W across two. If you will ever charge from panels, the Plus is the one to get.
Delta 3 Max Plus: the expandable 2,048 Wh model with 3,000W output and 1,000W of solar input described above. Treat it as the step up from the Delta 2 Max and base Delta 3 Max.
Delta Pro Ultra: EcoFlow's modular whole-home system, built from a separate inverter and 6 kWh battery modules. It sits above the Delta Pro 3 for buyers who want a semi-permanent home installation; compare it with other systems in our whole-home solar generator guide.

Smaller than a Delta? The River line covers 245–858 Wh — see which EcoFlow River to buy.

The Four EcoFlow Deltas We Rate, With Live Prices

Ordered by how well each suits most buyers. Specs and scores come from our product database; prices are live from Amazon.

Best Delta for most people

EcoFlow Delta 3 Plus

89/100

1,024 Wh 1,800W output 2,400W surge 1,000W solar in 26 lb

1,024 Wh with 1,000W of solar input and an expansion port, at about half the weight of the 2 kWh models. Covers camping, RV weekends and fridge-plus-router outage backup, and can grow later. Read our Delta 3 Plus review →

$719.00Current price on Amazon

Check Price on Amazon →

Lowest we’ve logged: $654.00 (Sep 24) · our log since Sep 18

Best 2 kWh Delta for solar and expansion

EcoFlow Delta 2 Max

85/100

2,048 Wh 2,400W output 4,800W surge 1,000W solar in 50 lb

The older model, but it takes 1,000W of solar across two inputs, has six AC outlets and expands to 6,144 Wh. The best 2 kWh Delta whenever its price is at or below the Delta 3 Max. Read our Delta 2 Max review →

See today’s price on Amazon

Check Price on Amazon →

Best 2 kWh Delta for wall-charged backup

EcoFlow Delta 3 Max

85/100

2,048 Wh 2,400W output 4,800W surge 500W solar in 45 lb

Same 2,048 Wh and 2,400W as the Delta 2 Max, lighter, quieter and with a sub-10 ms UPS switchover — but one 500W solar input and no expansion. Not the same product as the Delta 3 Max Plus. Read our Delta 3 Max review →

See today’s price on Amazon

Check Price on Amazon →

Best for whole-home backup

EcoFlow Delta Pro 3

95/100

4,096 Wh 4,000W output 8,000W surge 2,600W solar in 113.5 lb

4,096 Wh, 4,000W and 120/240V output for well pumps, central-air circuits and transfer switches, expandable with extra batteries. Heavy, on wheels, and priced accordingly. Read our Delta Pro 3 review →

$2,799.00Current price on Amazon

Check Price on Amazon →

Lowest we’ve logged: $2,784.00 (Sep 24) · our log since Sep 18

Prices shown are the current Amazon price. Badges come from our own daily price log — see the solar generator price tracker; they describe what we observed on the listing, not a manufacturer claim or a prediction.

Related Guides

EcoFlow Brand Guide

River, Delta and Delta Pro compared

Which EcoFlow River Should I Buy?

River 3 vs River 3 Plus vs River 3 Max Plus

EcoFlow Black Friday Deals

Which Delta models to watch this season

All Solar Generator Reviews

Every model we rate, in one sortable chart

EcoFlow Delta FAQ

Which EcoFlow Delta should I buy?

For most people, the Delta 3 Plus: 1,024 Wh, 1,800W, 1,000W of solar and an expansion port at 26 lb. If you need about 2 kWh, choose the Delta 2 Max for solar charging and expansion or the Delta 3 Max for lighter, wall-charged backup. For 240V whole-home circuits, choose the Delta Pro 3.

What is the difference between the Delta 3 Plus and the Delta 3 Max?

The Delta 3 Max has twice the capacity (2,048 Wh vs 1,024 Wh) and more output (2,400W vs 1,800W). The Delta 3 Plus takes twice the solar input (1,000W vs 500W), can add extra batteries, and weighs 26 lb against about 45 lb. The base Delta 3 Max cannot be expanded.

EcoFlow Delta 2 Max vs Delta 3 Max: which is better?

On paper the older Delta 2 Max wins on solar input (1,000W vs 500W), AC outlets (six vs four) and expansion (to 6,144 Wh vs none). The Delta 3 Max is lighter and advertises a faster UPS switchover (under 10 ms vs 30 ms). Both store 2,048 Wh and output 2,400W, so the cheaper of the two is usually the better buy unless you need its specific strength.

Is the Delta 3 Max the same as the Delta 3 Max Plus?

No. Both hold 2,048 Wh, but the Delta 3 Max Plus has 3,000W output, two solar inputs and supports extra batteries. The base Delta 3 Max has 2,400W output, one 500W solar input and no expansion. Check the listing title and specs before you buy.

Which EcoFlow Delta models can be expanded?

The Delta 3 Plus, Delta 2 Max (to 6,144 Wh with two extra batteries), Delta 3 Max Plus and Delta Pro 3 all accept extra batteries. The base Delta 3 Max does not.

Which EcoFlow Delta can power a whole house?

The Delta Pro 3 is the only one of these with 120/240V output, 4,000W continuous and 4,096 Wh per unit, so it can feed a transfer switch and 240V loads such as a well pump. The 2 kWh Deltas cover essentials like a fridge, lights, router and CPAP through a short outage, not whole-home circuits.