EcoFlow DELTA 3 Max
- AC delivered · est.
1,741 Wh. Show source
estimated sourceus.ecoflow.com ↗2026-07-04- output
2,400 W. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- surge
4,800 W. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- weight
20.3 kg. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- recharge
68 min. Show source
claimed sourceus.ecoflow.com ↗2026-07-04
Balanced
#7 of 20
in the Large (2 kWh class) class
Lifted by Capacity & expansion and Quiet / livability; held back by charging & solar.
Check current availability and pricing at the retailer.
See alternatives to the EcoFlow DELTA 3 Max →At a glance
We review EcoFlow DELTA 3 Max as a large (2 kwh class) model. Use output, delivered capacity and startup limits to check your appliances. It supplies 2,400 W of continuous AC output. BatteryRank scores it 65 out of 100 within its size class.
EcoFlow DELTA 3 Max specs at a glance
Find the reading you need, then follow its source in the full specifications below.
- How much does the EcoFlow DELTA 3 Max weigh?
20.3 kg (44.8 lb), manufacturer-claimed, without accessories.
Source and date. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- What are the dimensions of the EcoFlow DELTA 3 Max?
494 × 239 × 305 mm (19.4 × 9.4 × 12 in), length × width × height, manufacturer-claimed.
Source and date. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- How long does the EcoFlow DELTA 3 Max take to charge?
1 h 8 min from a wall outlet, 0 to 100%, manufacturer-claimed. Fast-charge modes and solar input differ — see the charging specs on this page.
Source and date. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- How many watts can the EcoFlow DELTA 3 Max output?
2,400 W continuous AC output and 4,800 W surge output, manufacturer-claimed. Appliance startup demand must stay within the relevant limit.
Source and date. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- How much solar input can the EcoFlow DELTA 3 Max accept?
500 W maximum solar input, manufacturer-claimed. Actual harvest depends on panel compatibility, sun, orientation, temperature, and conversion losses.
Source and date. Show source
claimed sourceus.ecoflow.com ↗2026-07-04
Our verdict on the EcoFlow DELTA 3 Max
The DELTA 3 Max is the sensible middle of the DELTA 3 line, and its defining number is not capacity but recharge speed: 2,048 Wh refilled 0-100% in 68 minutes at 1,800 W of AC input, a figure a third party has independently timed rather than one taken from the brochure. That changes how the unit is used — it favours short grid windows over hoarding charge. Its 2,400 W continuous inverter is deliberately below the Max Plus, so it is the capacity tier that does not quite carry the output tier along with it.
- Your outages come in bursts with brief power restorations between themA verified 68-minute full recharge at 1,800 W means a single hour of grid access refills the entire 2,048 Wh, which is a different operating pattern from units needing 4 hours.
- You want 2 kWh you can still move without helpAt 20.3 kg with dual fixed handles it is a genuine two-hand lift for one adult, where most 2,764 Wh and larger units cross into needing wheels or a second person.
- You are protecting a desk or media setup from short cutsSwitchover is under 10 ms across 4 NEMA 5-15R outlets rated 20 A, so a workstation, monitors and networking gear can sit behind it without rebooting on a blink.
- Any circuit you care about is 240 VSplit-phase output is absent on this model, so a well pump or a wired mini-split is out of reach no matter how much of the 2,048 Wh you have available. The Apex 300 provides true 240 V split-phase at 3,840 W continuous.
- It needs to travel with you rather than live in one roomAt 20.3 kg and 494 x 239 x 305 mm this is luggage, not gear. It suits a basement or a van that stays put far better than anything carried on foot. The RIVER 3 Plus does 600 W from 4.72 kg you can carry one-handed.
The trade-off to weigh: Quiet running is marketed hard here, and this is the one place our sourcing openly disagrees with EcoFlow. The specification claims 25 dB or below at 600 W, while an independent measurement puts it at 30-35 dB idling and 50-60 dB under heavy load. Both can be literally true at different draws, but anyone buying it to charge fast in a bedroom should plan around the higher figure, because 1,800 W of input is exactly when the fans work hardest.
What our data can’t tell you: We know this model is expandable and cannot tell you how far: no maximum expanded capacity is recorded in our dataset, so we will not quote a ceiling for it. Independent scored reviews are also thinner than the DELTA 3 name suggests — PCMag covered the Max Plus rather than this unit, and its Amazon feedback is not cleanly separable from sibling listings.
BatteryRank Engineering Team · Last reviewed · Method
Where to buy
Affiliate links: we may earn a commission if you buy, at no extra cost to you. Commission never affects our rankings.
EcoFlow DELTA 3 Max
Capacity truth
The watt-hour number on the box isn't what reaches your devices. Rated on the label vs what actually leaves an outlet.
2,048 Wh. Show source
claimed sourceus.ecoflow.com ↗2026-07-04The marketing number — total cell capacity.
1,741 Wh. Show source
estimated sourceestimate = battery-side usable capacity × 85% inverter efficiencyWhat reaches an AC outlet — about 15% is lost turning battery power into household AC. How we estimate.
Also independently measured
- Fan noise
30–35 dB. Show source
verified source30-35 dB idle to 50-60 dB heavy load (BatteryEssence)2026-07-04- AC charge time
0–80 min. Show source
verified source~68 min full; 0-80% ~1.13h (multiple review sites)2026-07-04
30-35 dB idle to 50-60 dB heavy load (BatteryEssence)
~68 min full; 0-80% ~1.13h (multiple review sites)
What it can run
Same sourced device assumptions used by our calculators, applied to this model's usable AC energy. Actual runtime varies with load, temperature, and standby draw.
| Device | Estimated runtime | Sourced assumption |
|---|---|---|
| CPAP (humidifier off) | about 24.2 nights | 9 W · |
| CPAP (heated humidifier on) | about 3.9 nights | 56 W · |
| Refrigerator (full-size) | about 28 hours | 180 W × 35% duty cycle · |
| Wi-Fi router + modem | about 97 hours | 18 W · |
| Laptop (65W charger) | about 54 hours | 65 W × 50% duty cycle · |
| Phone (one full charge) | about 87 full charges | 20 W · |
Who it fits
Mechanical matches against this model's own sourced specs — never invented sentiment, never a guess on a spec we don't have.
1741 Wh AC-delivered (est.) → multiple CPAP nights per charge
2400 W inverter, 1741 Wh AC-delivered (est.) → runs a fridge through an outage
2048 Wh, expandable, 12V DC out → long off-grid stays
How it scores
Four buyer pillars over seven sub-scores — computed from sourced data with a published formula, price-independent by design.
Power
Battery-side usable capacity and how much you can run at once.
Usable watt-hours and how far you can grow it with add-on batteries, versus its size class.
Continuous and surge wattage, outlet count, and USB-C fast-charging.
Trust
Owner reputation, safety record, warranty, and build durability.
Owner ratings, brand reputation, recall record, and warranty backing.
Rated cycle life, warranty length, cell chemistry, and weather sealing.
Charging
Wall and solar recharge speed.
Wall recharge speed, solar input, and multi-source charging.
Livability
Lightweight, portable, and quiet enough to live with.
Weight, footprint, handle, and wheels, versus its size class.
Fan noise under load — quieter is better for bedrooms and CPAP use.
How this score is computed
We score the hardware using sourced specifications and independently attributed measurements. Seven sub-scores form a 0–100 composite, grouped into four buyer pillars. The score is price-independent: a sale changes what you pay, while this analysis evaluates the station's capabilities within its size class.
| Pillar | Built from |
|---|---|
| Power | Capacity & expansion + Output & versatility |
| Trust | Trust & reliability + Durability & longevity |
| Charging | Charging & solar |
| Livability | Portability + Quiet / livability |
Scores are cohort-relative — each model is ranked against others in its size class. Missing inputs renormalize out rather than scoring zero. Incomplete evidence can leave a sub-score unavailable; it does not establish that a model performs well. Any figure resting on a documented estimate is tagged est. Read our scoring and evidence methodology.
Full specifications
Manufacturer-claimed unless marked verified (FCC/UL/DOE/lab). Tap or focus a figure to view its source.
Capacity & battery
- Battery-side usable capacity
2,048 Wh. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- Rated cycle life
4,000 cycles. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- Battery chemistry
LiFePO4. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- Rated capacity
2,048 Wh. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- Cycle-life threshold
80 %. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- Battery voltage
51.2 V. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- Battery amp-hours
40 Ah. Show source
claimed sourceus.ecoflow.com ↗2026-07-04
Energy available from the battery before output-conversion losses. AC-delivered capacity is shown separately in Capacity Truth.
How many full charge-and-drain cycles before the battery drops to its rated threshold (shown alongside — brands rate to different thresholds, so never compare bare cycle counts).
The type of battery cell. LiFePO4 (LFP) cells last far more cycles and are more thermally stable than older lithium-ion (NMC) cells.
The battery's nameplate energy capacity — the headline number on the box. Battery-side usable and AC-delivered capacity are shown separately.
The remaining-capacity level the cycle rating is measured to. 3,000 cycles to 80% is a stronger battery than 3,000 cycles to 70% — always read the two numbers together.
The internal battery pack's nominal voltage — mostly useful for cross-checking capacity math (volts × amp-hours ≈ watt-hours).
The pack's charge capacity in amp-hours at its nominal voltage — another way to state capacity; watt-hours is the number to compare across units.
Power output
- Continuous power output
2,400 W. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- Surge power output
4,800 W. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- AC outlets
4 outlets. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- USB-A ports
1 ports. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- USB-C ports
3 ports. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- USB-C max output
100 W. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- 12V car ports
1 ports. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- DC barrel ports
0 ports. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- Max combined output
2,400 W. Show source
claimed sourceus.ecoflow.com ↗2026-07-04
The most power you can draw at once, sustained — this has to be higher than the running wattage of whatever you're plugging in.
A brief power spike the unit can absorb when a device first switches on — matters for things with motors or compressors, like fridges.
How many standard wall-style outlets are built in.
How many USB-A ports are built in, for charging older phones, lights, and accessories.
How many USB-C ports are built in — check the per-port wattage below if you need fast charging for a laptop.
The fastest a single USB-C port can charge a device — relevant for laptops and fast-charging phones.
How many car-socket (cigarette-lighter) style 12V outputs are built in. Match the device or its supported converter to the port's voltage and current limits; a CPAP needs its exact model's documented power connection.
How many round barrel-style DC outputs are built in, used by routers, some lights, and older electronics.
The most power the unit can deliver across ALL ports at the same time — can be lower than the AC rating plus every USB port added up.
Charging & solar
- AC recharge speed
1,800 W. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- AC charge time (0–100%)
68 min. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- Max solar input
500 W. Show source
claimed sourceus.ecoflow.com ↗2026-07-04
How fast the unit recharges from a wall outlet — higher means shorter waits between uses.
How long a full recharge takes from a wall outlet, start to finish.
The most solar panel wattage the unit can accept — undersized panels just mean slower charging, not damage, but oversizing this is wasted money.
Reliability & durability
- UPS switchover time
10 ms. Show source
claimed sourceus.ecoflow.com ↗2026-07-04
How fast the unit takes over when grid power cuts out. Under ~20ms is fast enough that most electronics — including many CPAP machines — won't even blip.
Size & portability
- Weight
20.3 kg. Show source
claimed sourceus.ecoflow.com ↗2026-07-04
How much the unit weighs on its own, without accessories — relevant for portability and carrying it up stairs during an outage.
What reviewers & owners report
Named outlets and marketplaces, each rating credited where it was published.
- 2kWh LFP in a mid-size chassis — Across reviewers ·
- very fast ~68min AC charge — Across reviewers ·
- expandable — Across reviewers ·
- quiet (<=25dB at 600W) — Across reviewers ·
- X-Boost 3400W — Across reviewers ·
- Wi-Fi/BT app — Across reviewers ·
- 5-yr (3+2) coverage — Across reviewers ·
- 2400W continuous (below Max Plus 3000W) — Across reviewers ·
- only 1 USB-A — Across reviewers ·
- solar capped 500W (vs 1000W on Max Plus) — Across reviewers ·
- plain Max harder to find at US retail than Max Plus — Across reviewers ·
- Popular Mechanics: none
- Wirecutter: none
- covered as a mid-tier 2kWh option — YouTube reviewers ·
- no single measured consensus captured for the plain Max variant — YouTube reviewers ·
Brand reputation: 2025 model; DELTA 3 family well-regarded. Plain Max less prominent at US retail than Max Plus. Brand-level: EcoFlow DELTA Max 2000 (EFD310) fire recall 2025-10 (OLDER separate product, not DELTA 3 Max)
Sources: us.ecoflow.com/products/delta-3-max-series-portable-power-station?view=d3m (on-page Specs, Max variant) accessed 2026-07-04; backuppowerhub.com, batteryessence.com, voltagebasics.com; saferproducts.gov (EcoFlow) checked 2026-07-04
What else to consider instead of the EcoFlow DELTA 3 Max
Same or adjacent size class, ordered by the price-independent composite. Every alternative is better than the EcoFlow DELTA 3 Max at something and worse at something else, so each row states both halves — each one arithmetic on two sourced readings, with a dimension skipped rather than guessed when either side is missing a figure.
- DJI Power 2000score 75 · same size class
- Why you would switch
- The DJI Power 2000 carries 25% more continuous output (3,000 W vs 2,400 W), which decides what it can run at all.
- What you give up
- The EcoFlow DELTA 3 Max reaches a full AC charge in 68 minutes against 90.
- Aferiy P280score 74 · same size class
- Why you would switch
- The Aferiy P280 carries 17% more continuous output (2,800 W vs 2,400 W), which decides what it can run at all.
- What you give up
- Nothing the sourced data can show — the EcoFlow DELTA 3 Max leads on no compared dimension by a margin worth acting on.
- Oupes Mega 2 Proscore 69 · same size class
- Why you would switch
- The Oupes Mega 2 Pro takes 100% more rated solar input (1,000 W vs 500 W) for off-grid recharging.
- What you give up
- Nothing the sourced data can show — the EcoFlow DELTA 3 Max leads on no compared dimension by a margin worth acting on.
- Anker SOLIX C2000 Gen 2score 68 · same size class
- Why you would switch
- The Anker SOLIX C2000 Gen 2 takes 60% more rated solar input (800 W vs 500 W) for off-grid recharging.
- What you give up
- The EcoFlow DELTA 3 Max reaches a full AC charge in 68 minutes against 88.
- Bluetti Elite 200 v2score 68 · same size class
- Why you would switch
- The Bluetti Elite 200 v2 delivers 19% more usable AC energy (2,074 Wh vs 1,741 Wh).
- What you give up
- The EcoFlow DELTA 3 Max is 16% lighter (20.3 kg vs 24.2 kg).
Quick answers
Each answer restates a sourced figure from elsewhere on this page — nothing new, nothing guessed.
- How many amp-hours (Ah) or milliamp-hours (mAh) is the EcoFlow DELTA 3 Max?
- 40 Ah (40,000 mAh) at its nominal 51.2 V, manufacturer-claimed. Watt-hours is the number to compare across units. Use the mAh to Wh converter.
- How much capacity does the EcoFlow DELTA 3 Max deliver through an AC outlet?
- About 1,741 Wh of the rated 2,048 Wh reaches an AC outlet from a full charge — an estimate after our published 15% inverter-loss constant (marked est. on this page).
- What is the cycle-life rating of the EcoFlow DELTA 3 Max?
- 4,000 cycles to 80% remaining capacity, manufacturer-claimed. A cycle rating is not a calendar-life guarantee.
- Can the EcoFlow DELTA 3 Max work as a UPS?
- Its manufacturer-claimed transfer time is 10 ms. Confirm that your connected equipment tolerates that transfer time; this is not the same as a zero-transfer online UPS.
Keep exploring
- Refrigerator runtime guide
- CPAP nights-per-charge calculator
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- How Many Watts Does an RV Refrigerator Use?
- How Many Watts Does an Electric Cooler Use?
- Portable Power for a 12-Hour Outage
- Power an RV Refrigerator and Lights
- Complete CPAP Overnight Power Kit