EcoFlow DELTA 3
- AC delivered · est.
870 Wh. Show source
estimated sourceus.ecoflow.com ↗2026-07-04- output
1,800 W. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- surge
3,600 W. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- weight
12.5 kg. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- recharge
56 min. Show source
claimed sourceus.ecoflow.com ↗2026-07-04
Balanced
#4 of 19
in the Midsize (1 kWh class) class
Lifted by Durability & longevity; held back by capacity & expansion.
Check current availability and pricing at the retailer.
See alternatives to the EcoFlow DELTA 3 →At a glance
We review EcoFlow DELTA 3 as a midsize (1 kwh class) model. Use output, delivered capacity and startup limits to check your appliances. It supplies 1,800 W of continuous AC output. BatteryRank scores it 68 out of 100 within its size class.
EcoFlow DELTA 3 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 weigh?
12.5 kg (27.6 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?
398 × 202 × 284 mm (15.7 × 8 × 11.2 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 take to charge?
56 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 output?
1,800 W continuous AC output and 3,600 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 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- How far can the EcoFlow DELTA 3 expand?
Up to 5,000 Wh with compatible expansion hardware, manufacturer-claimed. The base-unit capacity and expansion-system capacity are shown separately.
Source and date. Show source
claimed sourceus.ecoflow.com ↗2026-07-04
Our verdict on the EcoFlow DELTA 3
Compare this against a DELTA 2 on the specification everyone checks and you will see no upgrade at all: both hold 1,024 Wh, both run 1,800 W continuous. The generational change is entirely in the numbers people skip. Rated cycles go from 3,000 to 4,000, switchover from 30 ms to 10 ms, recharge from 72 minutes to 56, surge from 2,700 W to 3,600 W, and the expansion ceiling from 2,048 Wh to 5,000 Wh. Capacity was never the thing that improved.
- You want a 1 kWh unit now that can become a 5 kWh system laterThe 5,000 Wh expansion ceiling is nearly two and a half times what the previous generation allowed, so the entry decision does not cap the eventual one.
- Sensitive electronics have to stay up through a cutoverA 10 ms switchover is inside what most desktop and networking power supplies ride out without resetting, which a 30 ms gap is not reliably.
- A 240 V circuit is part of what you need to back upThis is 120 V only. A well pump, an electric range or a dryer is not a question of having enough watts here — the output simply cannot address them. The DELTA Pro 3 provides 240 V split-phase output at 4,000 W.
- Weight is the deciding factor because you will carry it regularlyAt 12.5 kg it is at the heavy end of the 1 kWh class, and the expansion capability that justifies the mass is worth nothing if you never use it. It holds a comparable 1,070 Wh at 10.8 kg.
The trade-off to weigh: The 56-minute recharge is the headline and it is accurate, but it is achieved by pulling hard from the wall, which is audible and warms the unit. Charging speed of this kind is a mode you select for a reason, not the condition the unit sits in overnight, and treating it as the default misreads what the number describes.
What our data can’t tell you: The delivered-energy figure in our record for this unit was calculated from an assumed efficiency rather than measured, so we exclude it from our own research and cannot tell you what actually reaches an outlet. Its sibling the DELTA 2 has a real six-month measurement; this newer model has none, and cells changed between them.
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.
1,024 Wh. Show source
claimed sourceus.ecoflow.com ↗2026-07-04The marketing number — total cell capacity.
870 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
- AC charge time
56–90 min. Show source
verified source~56-90 min (OEM/Amazon 56 min; Backup Power Hub ~1.5h full with LFP taper)2026-07-04- Solar performance
—. Show source
verified source400W array ~2.5-3h; 220W ~4-5h; 110W ~8-10h (Backup Power Hub)2026-07-04
~56-90 min (OEM/Amazon 56 min; Backup Power Hub ~1.5h full with LFP taper)
400W array ~2.5-3h; 220W ~4-5h; 110W ~8-10h (Backup Power Hub)
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 12.1 nights | 9 W · |
| CPAP (heated humidifier on) | about 1.9 nights | 56 W · |
| Refrigerator (full-size) | about 14 hours | 180 W × 35% duty cycle · |
| Wi-Fi router + modem | about 48 hours | 18 W · |
| Laptop (65W charger) | about 27 hours | 65 W × 50% duty cycle · |
| Phone (one full charge) | about 43 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.
12.5 kg with 500 W solar input → carry-in, solar-rechargeable
870 Wh AC-delivered (est.) → multiple CPAP nights per charge
1800 W inverter, 870 Wh AC-delivered (est.) → runs a fridge through an outage
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
42% dataOwner 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
1,024 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- Max capacity with expansion
5,000 Wh. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- Rated capacity
1,024 Wh. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- Cycle-life threshold
80 %. 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 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
1,800 W. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- Surge power output
3,600 W. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- AC outlets
6 outlets. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- USB-A ports
2 ports. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- USB-C ports
2 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
2 ports. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- Max combined output
1,800 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
1,500 W. Show source
claimed sourceus.ecoflow.com ↗2026-07-04- AC charge time (0–100%)
56 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
12.5 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.
- fastest AC charging in ~$500 class — Across reviewers ·
- expandable platform to 5kWh — Across reviewers ·
- 5 recharge methods — Across reviewers ·
- 5-yr warranty (beats Jackery/Bluetti) — Across reviewers ·
- LFP 4000-cycle — Across reviewers ·
- Wi-Fi+BT app with TOU & storm alerts — Across reviewers ·
- Amazon BSR #3 — Across reviewers ·
- 1800W base output (2200W X-Boost) limits heavy appliances — Across reviewers ·
- ~28.7 lb with no folding handle — Across reviewers ·
- LFP charge taper on last 20% — Across reviewers ·
- no 240V — Across reviewers ·
- Wirecutter: none
- Popular Mechanics: none (PopMech reviewed DELTA 3 Plus, not base)
- portable-power channels rate it a top value 1kWh pick (PortablePowerNerd "top pick" after 3-mo test) — YouTube reviewers ·
- no single measured consensus captured — YouTube reviewers ·
Brand reputation: Very popular 2024 model; Amazon 4.8/1268, BSR #3 Outdoor Generators; reviewers call it best value in class ("a platform, not just a battery"). Brand-level: EcoFlow DELTA Max 2000 (EFD310) fire recall 2025-10 — DIFFERENT older product, not DELTA 3
Sources: us.ecoflow.com/products/delta-3-portable-power-station (on-page Specs) accessed 2026-07-04; amazon.com/dp/B0DCBYMC9D accessed 2026-07-04; backuppowerhub.com (8.4/10); portablepowernerd.com (top pick, 3-mo); protoolsadvisor.com; saferproducts.gov (EcoFlow) checked 2026-07-04
What else to consider instead of the EcoFlow DELTA 3
Same or adjacent size class, ordered by the price-independent composite. Every alternative is better than the EcoFlow DELTA 3 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.
- EcoFlow DELTA 3 Plusscore 72 · same size class
- Why you would switch
- The EcoFlow DELTA 3 Plus 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 leads on no compared dimension by a margin worth acting on.
- DJI Power 1000 V2score 71 · same size class
- Why you would switch
- The DJI Power 1000 V2 carries 44% more continuous output (2,600 W vs 1,800 W), which decides what it can run at all.
- What you give up
- Nothing the sourced data can show — the EcoFlow DELTA 3 leads on no compared dimension by a margin worth acting on.
- Anker SOLIX C1000 Gen 2score 68 · same size class
- Why you would switch
- The Anker SOLIX C1000 Gen 2 carries 11% more continuous output (2,000 W vs 1,800 W), which decides what it can run at all.
- What you give up
- The EcoFlow DELTA 3 supports add-on batteries, so capacity can grow later.
- Bluetti Elite 100 v2score 67 · same size class
- Why you would switch
- The Bluetti Elite 100 v2 delivers 15% more usable AC energy (1,000 Wh vs 870 Wh).
- What you give up
- The EcoFlow DELTA 3 reaches a full AC charge in 56 minutes against 70.
- Oupes Mega 1score 66 · same size class
- Why you would switch
- The Oupes Mega 1 carries 11% more continuous output (2,000 W vs 1,800 W), which decides what it can run at all.
- What you give up
- Nothing the sourced data can show — the EcoFlow DELTA 3 leads on no compared dimension by a margin worth acting on.
Quick answers
Each answer restates a sourced figure from elsewhere on this page — nothing new, nothing guessed.
- How many milliamp-hours (mAh) is the EcoFlow DELTA 3?
- Its manufacturer-claimed capacity is 1,024 Wh. A mAh conversion also needs the battery's nominal voltage: mAh = Wh × 1,000 ÷ V. Our record has no sourced nominal battery voltage, so we leave the mAh figure unspecified. USB output voltage is not a substitute for battery voltage. Compare watt-hours across power stations. Use the mAh to Wh converter.
- How much capacity does the EcoFlow DELTA 3 deliver through an AC outlet?
- About 870 Wh of the rated 1,024 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?
- 4,000 cycles to 80% remaining capacity, manufacturer-claimed. A cycle rating is not a calendar-life guarantee.
- Can the EcoFlow DELTA 3 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.