Product Review · Updated November 2026
EcoFlow DELTA 3 Max Plus Review: The 2kWh Delta That Can Grow
The EcoFlow DELTA 3 Max Plus is a 2,048Wh LFP power station with 3,000W of output (6,000W surge), two solar inputs totaling 1,000W, and an expansion port EcoFlow rates to 10kWh. It has the same battery as the base Delta 3 Max. The Plus adds the bigger inverter, double the solar input and expansion, and it weighs 3.7 lb more. If you might add a battery or charge from panels, buy the Plus.
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By Morgan Chen
Reviewed & approved by Juhi Sahni
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Published: 2026-11-07
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Updated:
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Which EcoFlow Delta
Capacity
2,048
Watt-hours (LFP)
AC Output
3,000
Watts (6,000W surge)
Weight
48.7
Pounds
Solar Input
1,000
Watts max (2 inputs)
Current price on Amazon: $1,149.00
Deciding between the two? Jump to Delta 3 Max vs. Max Plus.
Delta 3 Max vs. Delta 3 Max Plus: What the Plus Adds
EcoFlow launched both models in late September with the same 2,048Wh battery, and the names are easy to mix up. Per ESS News and The Solar Lab, the base Max has no expansion port. Here is everything the Plus changes:
| Spec | Delta 3 Max | Delta 3 Max Plus |
|---|---|---|
| Capacity | 2,048 Wh | 2,048 Wh |
| Continuous / surge | 2,400W / 4,800W | 3,000W / 6,000W |
| Solar input | 500W, one input | 1,000W, two inputs |
| Battery expansion | None | 2–10 kWh (EcoFlow) |
| 12V 30A Anderson DC port | Not listed | Yes |
| UPS switchover | <10 ms | <10 ms |
| Weight | 45 lb | 48.7 lb |
| Our score | 85/100 | 87/100 |
| Price | $878.99 | $1,149.00 |
Sources: EcoFlow’s DELTA 3 Max Plus product page, StorageReview, The Technology Man (which notes the base Max has no 30A DC output) and both Amazon listings. Delta 3 Max figures come from our Delta 3 Max review.
What the upgrades mean in practice
- 600W more inverter. At 3,000W you can run an 1,100W microwave, a 700W fridge start-up and a 1,000W space heater together. That 2,800W combination is over the base Max’s 2,400W limit. EcoFlow also lists X-Boost to 3,800W for resistive loads like kettles and heaters. X-Boost lowers the voltage, so it does not suit motors or electronics.
- Double the solar. Two 500W inputs (11–60V each, per The Technology Man and StorageReview) let you run two separate panel strings. Plan on about 75% of the panel rating. That means 1,000W of panels refills the 2,048Wh battery in about 2.7 hours of strong sun. On the Max’s 500W input it takes about 5.5 hours.
- Expansion. This is the main reason to pay more. A 2kWh station that can later become 4–10kWh can cover a multi-day outage. See how far it expands below.
- The cost. The Plus weighs 3.7 lb more. Check the live price gap in the table above. If you will only ever recharge from the wall and never add a battery, the base Delta 3 Max does the same job.
DELTA 3 Max Plus Extra Battery: How Far It Really Expands
EcoFlow advertises “2–10kWh scalable capacity.” The footnotes on its product page explain how to get there. One Max Plus connects to two extra batteries, using either two DELTA 3 Max Plus Smart Extra Batteries or two DELTA Pro 3 Smart Extra Batteries. Most listings skip this, but the battery you choose sets your ceiling:
| Setup | Total capacity | Usable (~85%) |
|---|---|---|
| Max Plus alone | 2,048 Wh | ~1,741 Wh |
| + 1 DELTA 3 Max Plus Extra Battery (2,048Wh) | 4,096 Wh | ~3,482 Wh |
| + 2 DELTA 3 Max Plus Extra Batteries | 6,144 Wh | ~5,222 Wh |
| + 2 DELTA Pro 3 Smart Extra Batteries (4,096Wh each) | 10,240 Wh | ~8,704 Wh |
With its own 2,048Wh extra batteries, the Max Plus tops out at 6,144Wh, the same as a fully expanded Delta 2 Max. The 10kWh figure needs the larger DELTA Pro 3 batteries. Some retailers, including B&H, list “up to 11 kWh”, but we use EcoFlow’s own figure. EcoFlow’s footnotes also mention a Smart Extra Battery Expansion Adapter that it says “will be released soon.” Check EcoFlow’s current compatibility notes before you buy a second battery. The extra battery’s Amazon listing names the DELTA 3 Max Plus and the 3kWh DELTA 3 Ultra Plus. The newer DELTA 3800 Gen4 also accepts DELTA 3 Max Plus extra batteries, according to its listing, so the battery isn’t tied to one station. Our EcoFlow extra battery guide charts which pack fits every Delta, including the pairings EcoFlow’s own sources disagree on.
DELTA 3 Max Plus Extra Battery (2,048Wh LFP)
Doubles the Max Plus to 4,096Wh, enough for about 58 hours of an average fridge. Current price on Amazon: $859.00
To compare expansion paths across brands, see our expandable power station guide.
DELTA 3 Max Plus vs. Delta 2 Max, Anker C2000 Gen 2 and DELTA 3000 Gen4
Specs come from our product database. Current prices come from Amazon.
| Generator | Capacity | Output | Solar In | Weight | Expands | Price | Amazon |
|---|---|---|---|---|---|---|---|
| ★ EcoFlow Delta 3 Max Plus | 2,048 Wh | 3,000W | 1,000W | 48.7 lb | To 10 kWh | $1,149.00 | View → |
| EcoFlow Delta 3 Max | 2,048 Wh | 2,400W | 500W | 45 lb | No | $878.99 | View → |
| EcoFlow Delta 2 Max | 2,048 Wh | 2,400W | 1,000W | 50 lb | To 6,144 Wh | $1,028.99 | View → |
| Anker SOLIX C2000 Gen 2 | 2,048 Wh | 2,400W | 800W | 41.7 lb | To 4 kWh | $1,499.00 | View → |
| EcoFlow DELTA 3000 Gen4 | 3,072 Wh | 3,600W | 1,000W | 57.3 lb | No | Check price at Amazon → | View → |
Delta 3 Max Plus vs. Delta 2 Max
On paper, the Max Plus is the true successor to the Delta 2 Max. Both have 2,048Wh and 1,000W of solar across two inputs, and both reach 6,144Wh with two of their own extra batteries. The Max Plus adds 600W of continuous output, a higher ceiling with DELTA Pro 3 batteries, and a faster advertised UPS switchover (under 10ms vs. 30ms for the Delta 2 Max). It is also 1.3 lb lighter. The Delta 2 Max has six AC outlets to the Max Plus’s four, and it has historically been discounted as the older model. If its price is well below the Max Plus and 2,400W covers your loads, it is still a reasonable buy.
Delta 3 Max Plus vs. Anker SOLIX C2000 Gen 2
The Anker SOLIX C2000 Gen 2 has the same 2,048Wh and is the lighter unit at 41.7 lb. It also has a TT-30 RV outlet. The Max Plus wins on output (3,000W vs. 2,400W), solar (1,000W vs. 800W) and expansion ceiling (10kWh vs. 4kWh). For an RV that plugs into a TT-30 inlet, choose the Anker. For a home backup system you might expand, choose the Max Plus.
Delta 3 Max Plus vs. DELTA 3000 Gen4
EcoFlow’s new DELTA 3000 Gen4 holds 3,072Wh with a 3,600W inverter in a 57.3 lb case, but it cannot be expanded and takes 1,000W of solar on a single input. Add one extra battery to the Max Plus and you have 4,096Wh, more than the 3000 Gen4. The two pieces also split into lighter carries. Choose the Gen4 if you want about 3kWh in one box and 3,600W for a well pump or large tools. Choose the Max Plus if you want to start at 2kWh and grow. In our scoring both rate 87/100. For the full lineup, see Which EcoFlow DELTA should I buy? For every 2kWh rival, see our best 2000Wh solar generators.
Pros & Cons
Pros
- ✓ 3,000W continuous / 6,000W surge, more than the Delta 3 Max or Delta 2 Max
- ✓ Expandable from 2kWh to 10kWh (EcoFlow figure)
- ✓ 1,000W of solar across two inputs
- ✓ UPS switchover under 10ms
- ✓ 0–80% on AC in 64 minutes (EcoFlow figure)
- ✓ 12V 30A Anderson port for DC loads
Cons
- ✗ The 10kWh ceiling needs DELTA Pro 3 batteries; its own extra batteries top out at 6,144Wh
- ✗ Four AC outlets (the Delta 2 Max has six)
- ✗ 120V only, with no published 240V or Smart Home Panel support
- ✗ 60V solar input ceiling limits series wiring
- ✗ The full warranty term requires registration (3 years base, plus 2 on registration)
Real-World Runtime: How Long Will It Last?
Plan on about 85% of the rated capacity reaching your devices after inverter losses. That is roughly 1,741Wh on the Max Plus alone and 3,482Wh with one extra battery. Runtime = usable Wh ÷ load. These are planning estimates, not measurements.
| Typical load | Approx. draw | Max Plus (2,048Wh) | + 1 extra battery (4,096Wh) |
|---|---|---|---|
| Fridge (averaged over its on/off cycle) | 60 W | ~29 hours | ~58 hours |
| Fridge + router + LED lights + phones | 300 W | ~5.8 hours | ~12 hours |
| Fridge + freezer + CPAP + fans | 500 W | ~3.5 hours | ~7.0 hours |
| Furnace blower + fridge + small appliances | 1,000 W | ~1.7 hours | ~3.5 hours |
| Microwave + fridge + coffee maker | 2,000 W | ~52 minutes | ~1.7 hours |
| Maximum continuous output | 3,000 W | ~35 minutes | ~1.2 hours |
A fridge cycles on and off, so its average draw is far below its running watts. Check the label or use a plug-in meter for your own number. To size a full outage plan, use the solar size calculator.
Charging & Solar Input
| Source | Published figure | Notes |
|---|---|---|
| AC wall | 1,800W; 0–80% in 64 min | EcoFlow and StorageReview. Adjustable in the app. |
| Solar | 1,000W; 2 × 500W XT60 | 11–60V per input |
| Smart Generator | 0–80% in 43 min | EcoFlow’s figure, measured with its Smart Generator 4000 (Dual Fuel) in optimal conditions |
| Car alternator | Supported | Needs the Alternator Charger Plus 1000, sold separately. EcoFlow says it “will be launched soon” |
| Solar + alternator | Supported | One of EcoFlow’s five listed charging methods |
Sources disagree on AC input. T3, a UK publication, quotes 2,300W, and The Technology Man review also lists a fast mode up to 2,300W. EcoFlow’s US page and StorageReview both list 1,800W for the 120V model sold on Amazon here. We use 1,800W. The 2,300W figure appears to apply to 230V-market units.
Wiring tip: the 60V ceiling applies to each input. Panel open-circuit voltage rises in cold weather, so check each panel’s Voc before stringing two together in series. With two inputs, the simplest high-output setup is two separate 400–500W strings, one per port. Our EcoFlow power station guide covers EcoFlow’s panel options.
Who Should Buy the DELTA 3 Max Plus — and Who Shouldn't
Buy it if you…
- ✓ Want 2kWh now with the option to reach 4–10kWh later without replacing the unit
- ✓ Run high-draw 120V loads like a microwave plus fridge, or power tools, that would push a 2,400W inverter
- ✓ Charge from solar and want two panel strings
- ✓ Keep a desk, router or medical device on it full time. The sub-10ms UPS suits that (see power station vs. UPS)
Skip it if you…
- ✗ Will only ever charge from the wall and never add a battery. The Delta 3 Max covers that
- ✗ Need 240V for a well pump or a split-phase panel. The Delta Pro 3 is EcoFlow’s portable 240V option
- ✗ Want 3kWh in one box with no add-ons. The DELTA 3000 Gen4 fits
- ✗ Need about 1kWh for camping. The Delta 3 Plus weighs 27.6 lb
Full Specifications
| Battery capacity | 2,048 Wh (LFP) |
| AC output | 3,000W continuous · 6,000W surge · X-Boost to 3,800W (EcoFlow) |
| AC outlets | 4 × NEMA 5-20R, 120V (StorageReview) |
| USB | 1 × 140W USB-C, 2 × 45W USB-C, 1 × USB-A |
| DC | 12V 30A Anderson port; 12V car socket |
| Solar input | 1,000W total, 2 × XT60 (500W each, 11–60V) |
| AC charging | 1,800W; 0–80% in 64 min |
| Expandability | 2–10 kWh with up to two extra batteries (DELTA 3 Max Plus or DELTA Pro 3 Smart Extra Battery) |
| UPS switchover | <10 ms |
| Noise | ≤25 dB at 600W, measured at 0.5 m (EcoFlow) |
| Weight | 48.7 lb (22.1 kg) |
| Dimensions | 494 × 242 × 305 mm (H × W × D, StorageReview) |
| Lifespan | EcoFlow estimates about 10 years with proper use; no cycle rating published |
| Warranty | 3 years, plus 2 years on registration (StorageReview) |
One Amazon listing bullet mentions a “DELTA2 Max … 5-year service.” That text refers to a different model, so we ignore it. Confirm warranty terms with EcoFlow at registration.
Verdict
The Delta 3 Max Plus is the 2kWh Delta to buy if you want room to grow.
It keeps the base Max’s battery and fast wall charging. It adds a 3,000W inverter, double the solar input and expansion to as much as 10kWh, for 3.7 lb more. In our scoring it rates 87/100, a score built from published specs and the current Amazon price. The base Delta 3 Max rates 85/100 and the Delta 2 Max rates 85/100. The catch is the 10kWh ceiling, which needs DELTA Pro 3 batteries. With its own extra batteries it tops out at 6,144Wh. Like the rest of the Delta line, it has historically been discounted during holiday sales. Compare the live prices above before you choose.
Sources & Data Verification
We do not physically test units. This review synthesizes manufacturer specs, third-party reviews and the Amazon listings. Runtime figures are planning estimates. Specs we could not confirm from at least two independent sources are labeled or omitted. Read more on our Editorial Standards page.
- • EcoFlow — DELTA 3 Max Plus product page (capacity, output, X-Boost, AC charging, expansion footnotes, UPS, noise, lifespan)
- • StorageReview — DELTA 3 Max Plus and Ultra Plus review (ports, solar inputs, weight, dimensions, warranty)
- • The Technology Man — DELTA 3 Max Plus review (per-input solar limits, DC ports, weight)
- • ESS News — Delta 3 Max and Max Plus launch coverage; The Solar Lab — Delta 3 Max review
- • Amazon listings for the DELTA 3 Max Plus and the DELTA 3 Max Plus Extra Battery (titles and bullets, checked November 7, 2026)
Frequently Asked Questions
What is the difference between the Delta 3 Max and the Delta 3 Max Plus?
Both hold 2,048Wh. The Max Plus adds a 3,000W inverter (6,000W surge) against 2,400W, two solar inputs totaling 1,000W against one 500W input, a 12V 30A Anderson port and expansion to as much as 10kWh. The base Max cannot be expanded. The Max Plus weighs 48.7 lb against 45 lb.
How far can the Delta 3 Max Plus be expanded with extra batteries?
EcoFlow rates it at 2–10kWh with up to two extra batteries. Two 2,048Wh DELTA 3 Max Plus Extra Batteries bring it to 6,144Wh. Reaching about 10kWh (10,240Wh) takes two 4,096Wh DELTA Pro 3 Smart Extra Batteries. EcoFlow also mentions an expansion adapter that it says will be released soon, so check its compatibility notes before buying a second battery.
How much solar input does the Delta 3 Max Plus take?
Up to 1,000W across two XT60 inputs, 500W each at 11–60V. At a realistic 75% of panel rating, 1,000W of panels refills the battery in about 2.7 hours of strong sun. The base Delta 3 Max takes 500W on one input.
Is the Delta 3 Max Plus better than the Delta 2 Max?
On paper, yes. Both have 2,048Wh, 1,000W of solar and reach 6,144Wh with two of their own extra batteries. The Max Plus adds 3,000W of output against 2,400W, a 10kWh ceiling with DELTA Pro 3 batteries, an advertised UPS under 10ms against 30ms, and a lighter body. The Delta 2 Max has six AC outlets against four and can be the better buy when it is priced well below the Max Plus.
Delta 3 Max Plus vs. Anker SOLIX C2000 Gen 2: which should I buy?
Both store 2,048Wh. The Anker is lighter at 41.7 lb and has a TT-30 RV outlet. The Max Plus has more output (3,000W vs. 2,400W), more solar input (1,000W vs. 800W) and a higher expansion ceiling (10kWh vs. 4kWh). Choose the Anker for RV hookups and the Max Plus for expandable home backup.
How long will the Delta 3 Max Plus run a refrigerator?
About 29 hours for a typical fridge that averages 60W over its cycle, using roughly 1,741Wh of usable energy. With one 2,048Wh extra battery, that rises to about 58 hours. These are planning estimates. Your fridge’s real average draw sets the actual runtime.