EcoFlow DELTA 2 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 ↗- surge
4,800 W. Show source
claimed sourceecoflow.com ↗- weight
23 kg. Show source
claimed sourceus.ecoflow.com ↗
Balanced
#8 of 20
in the Large (2 kWh class) class
Lifted by Trust & reliability and Quiet / livability; held back by portability.
Check current availability and pricing at the retailer.
Check price on AmazonSee alternatives to the EcoFlow DELTA 2 Max →At a glance
EcoFlow DELTA 2 Max is a large (2 kwh class) model best suited to cpap traveler. It supplies 2,400 W of continuous AC output. BatteryRank scores it 65 out of 100 within its size class.
Our verdict on the EcoFlow DELTA 2 Max
An older-generation unit that survives on outlet count and warranty rather than headline figures. Six AC sockets is more than almost anything else at 2,048 Wh, and the 5-year cover is at the top of the catalog. What dates it is the 30 ms switchover — the slowest we hold — and a 3,000-cycle rating where newer packs reach 4,000. Buy it for breadth of connection, not for the UPS role its switchover figure cannot really fill.
- You are powering many small things rather than one large one6 AC sockets is the highest count in the 2 kWh class we track, and at 2,400 W continuous the budget is generous enough that you will fill the sockets before you exhaust the inverter.
- Long commercial cover matters to youThe 5-year warranty is two years longer than what Jackery attaches to its comparable Explorer units, which is the kind of difference that outlives the specification argument.
- You want expansion without moving up a weight classAt 23 kg it accepts add-on batteries while staying lighter than the 27.9 kg and 28.3 kg rivals in the same capacity band.
- You want it to protect a desktop or a NAS from brownoutsA 30 ms switchover is the slowest figure in our catalog and sits right at the edge where computer power supplies begin to drop out — the newer units in this class manage 10 ms. The DELTA 3 Max Plus raises the surge ceiling to 6,000 W from 4,800 W.
- A 240 V load is anywhere in your planThis unit has no split-phase provision, so the 2,400 W continuous rating is entirely 120 V and a 240 V appliance cannot be connected at all. The 2000 Plus supports 240 V split-phase output, which this model lacks.
The honest limit: EcoFlow markets UPS behaviour across the DELTA range, and this unit inherits the claim without the hardware to match it. At 30 ms the transfer is three times slower than its own successors and slow enough that a desktop computer may reboot. The feature is present and will protect a router or a lamp; it should not be relied on for anything that hates losing power.
What our data can’t tell you: No wall-recharge time is sourced for this model, which is a significant hole — recharge pacing is one of the main axes on which 2 kWh units differ, and we cannot place this one on it. We also hold no noise reading, no dimensions and no expansion ceiling, so the expandability claim has no stated upper bound.
BatteryRank Engineering Team · Last reviewed · Method
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, 40-50 dB medium, 50-60 dB heavy load (BatteryEssence)2026-07-04- AC charge time
60 min. Show source
verified source~60 min AC (OEM/Amazon "Full Charge in 1 Hr")2026-07-04- Solar performance
—. Show source
verified sourcedual XT60 solar ports up to 1000W total2026-07-04
30-35 dB idle, 40-50 dB medium, 50-60 dB heavy load (BatteryEssence)
~60 min AC (OEM/Amazon "Full Charge in 1 Hr")
dual XT60 solar ports up to 1000W total
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
est.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
The BatteryRank score is computed from sourced data with a published formula — ranked by data, not lab testing. Seven sub-scores blend into a 0–100 composite, grouped into four buyer pillars. Price is deliberately not a scoring input: prices move daily, so value intelligence lives in the price section above, judged against this model's own history.
| 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 (a model is never penalized for a spec nobody in its class publishes), and any figure resting on a documented estimate is tagged est. A full methodology page is coming.
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 ↗- Rated cycle life
3,000 cycles. Show source
claimed sourceus.ecoflow.com ↗- Battery chemistry
LiFePO4. Show source
claimed sourceecoflow.com ↗- Max capacity with expansion
6,144 Wh. Show source
claimed sourceus.ecoflow.com ↗- Rated capacity
2,048 Wh. Show source
claimed sourceus.ecoflow.com ↗- Cycle-life threshold
80 %. Show source
claimed sourceus.ecoflow.com ↗
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 largest total capacity this unit can reach once you add every supported expansion battery.
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.
Power output
- Continuous power output
2,400 W. Show source
claimed sourceus.ecoflow.com ↗- Surge power output
4,800 W. Show source
claimed sourceecoflow.com ↗- AC outlets
6 outlets. Show source
claimed sourceus.ecoflow.com ↗- USB-A ports
4 ports. Show source
claimed sourceus.ecoflow.com ↗- USB-C ports
2 ports. Show source
claimed sourceus.ecoflow.com ↗- USB-C max output
100 W. Show source
claimed sourceus.ecoflow.com ↗- 12V car ports
1 ports. Show source
claimed sourceus.ecoflow.com ↗- DC barrel ports
2 ports. Show source
claimed sourceus.ecoflow.com ↗- Max combined output
2,400 W. Show source
claimed sourceus.ecoflow.com ↗
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 — what CPAPs and car fridges plug into for the most efficient overnight running.
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 ↗- Max solar input
1,000 W. Show source
claimed sourceus.ecoflow.com ↗
How fast the unit recharges from a wall outlet — higher means shorter waits between uses.
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
30 ms. Show source
claimed sourceecoflow.com ↗
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
23 kg. Show source
claimed sourceus.ecoflow.com ↗
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.
- proven 2kWh LFP with 2400W/4800W — Across reviewers ·
- expandable to 6kWh — Across reviewers ·
- fast 1hr X-Stream charge — Across reviewers ·
- 15 ports — Across reviewers ·
- ecosystem (WAVE/GLACIER) — Across reviewers ·
- 5-yr warranty — Across reviewers ·
- frequently discounted — Across reviewers ·
- older generation (slower ~30ms UPS vs DELTA 3 <10ms) — Across reviewers ·
- heavy ~50lb — Across reviewers ·
- no 240V — Across reviewers ·
- being succeeded by DELTA 3 Max — Across reviewers ·
- Wirecutter: none
- Popular Mechanics: none
- widely covered older-gen 2kWh — YouTube reviewers ·
- solid but superseded by DELTA 3 line — YouTube reviewers ·
- no single measured consensus captured here — YouTube reviewers ·
Brand reputation: Established 2023 model; Amazon 4.6/1286, BSR #10. Well-proven. Brand-level: EcoFlow DELTA Max 2000 (EFD310) fire recall 2025-10 — that is the OLDER DELTA Max (2021 gen), NOT this DELTA 2 Max; do not conflate
Sources: us.ecoflow.com/products/delta-2-max-portable-power-station (on-page Specs) accessed 2026-07-04; amazon.com/dp/B0C4DW17PD accessed 2026-07-04; saferproducts.gov (EcoFlow) checked 2026-07-04
What else to consider instead of the EcoFlow DELTA 2 Max
Same or adjacent size class, ordered by the price-independent composite. Every alternative is better than the EcoFlow DELTA 2 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 2 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 2 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 is rated for 4,000 cycles against 3,000.
- What you give up
- Nothing the sourced data can show — the EcoFlow DELTA 2 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 is 18% lighter (18.9 kg vs 23 kg).
- What you give up
- The EcoFlow DELTA 2 Max takes 25% more rated solar input (1,000 W vs 800 W) for off-grid recharging.
- 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 2 Max supports add-on batteries, so capacity can grow later.
Quick answers
Each answer restates a sourced figure from elsewhere on this page — nothing new, nothing guessed.
- How much does the EcoFlow DELTA 2 Max weigh?
- 23 kg (50.7 lb), manufacturer-claimed, without accessories.
- What are the dimensions of the EcoFlow DELTA 2 Max?
- 497 × 242 × 305 mm (19.6 × 9.5 × 12 in), length × width × height, manufacturer-claimed.
- How much capacity does the EcoFlow DELTA 2 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).
- How many watts can the EcoFlow DELTA 2 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.
- How much solar input can the EcoFlow DELTA 2 Max accept?
- 1,000 W maximum solar input, manufacturer-claimed. Actual harvest depends on panel compatibility, sun, orientation, temperature, and conversion losses.
- What is the cycle-life rating of the EcoFlow DELTA 2 Max?
- 3,000 cycles to 80% remaining capacity, manufacturer-claimed. A cycle rating is not a calendar-life guarantee.
- Can the EcoFlow DELTA 2 Max work as a UPS?
- Its manufacturer-claimed transfer time is 30 ms. Confirm that your connected equipment tolerates that transfer time; this is not the same as a zero-transfer online UPS.
- How far can the EcoFlow DELTA 2 Max expand?
- Up to 6,144 Wh with compatible expansion hardware, manufacturer-claimed. The base-unit capacity and expansion-system capacity are shown separately.
Keep exploring
- Refrigerator runtime guide
- CPAP nights-per-charge calculator
- How Many Watts Does a Chest Freezer Use?
- How Many Watts Does a 12V Camping Fridge Use?
- 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