EcoFlow DELTA 3 Classic (1024Wh)
- AC delivered · est.
870 Wh. Show source
estimated sourcemanuals.ecoflow.com ↗2026-07-27- output
1,800 W. Show source
claimed sourcemanuals.ecoflow.com ↗- surge
3,600 W. Show source
claimed sourcemanuals.ecoflow.com ↗- weight
12.1 kg. Show source
claimed sourcemanuals.ecoflow.com ↗
Balanced
#16 of 19
in the Midsize (1 kWh class) class
Lifted by Charging & solar and Quiet / livability; held back by capacity & expansion.
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EcoFlow DELTA 3 Classic (1024Wh) is a midsize (1 kwh class) model best suited to camper. It supplies 1,800 W of continuous AC output. BatteryRank scores it 50 out of 100 within its size class.
Our verdict on the EcoFlow DELTA 3 Classic (1024Wh)
The base rung of the DELTA 3 line, and the trade-offs are exactly what you would expect at the bottom of a range: 1,024 Wh with a strong 1,800 W inverter and 3,600 W surge, but a sealed pack and only 500 W of solar input — half what its Max Plus sibling accepts. At 12.1 kg with a 10 ms switchover it is a capable indoor backup unit. The solar ceiling is what disqualifies it from off-grid duty.
- You want appliance-grade output in a unit one person moves easily1,800 W continuous with a 3,600 W surge ceiling covers a microwave or a kettle individually, in a 12.1 kg body.
- It will spend its life indoors on grid backupThe 10 ms switchover and 3,600 W of headroom suit a home office or a kitchen counter, where the 500 W solar limit never comes up.
- You plan to charge it primarily from panelsA 500 W solar ceiling is half of what the 2,048 Wh Max Plus accepts, so refilling 1,024 Wh takes a long stretch of good conditions. The Max Plus accepts 1,000 W of solar and adds add-on battery support.
- You want the option to add storage laterThis pack is sealed at 1,024 Wh with no expansion port, so growth means a second unit rather than a module. The AC200L starts at 2,048 Wh and accepts add-on batteries.
The honest limit: EcoFlow markets the DELTA 3 family on fast charging and UPS behaviour, and the Classic inherits the 10 ms switchover honestly. What it does not inherit is the charging infrastructure around it — a 500 W solar ceiling is the lowest in the family, so the "charge anywhere" framing that applies to its siblings applies considerably less here.
What our data can’t tell you: This unit has one of the thinner records in our catalog: no cycle-life rating, no depth-of-discharge threshold, no AC outlet count, no usable capacity and no wall-recharge time. The missing cycle rating is the most consequential, because it is the figure that tells you how many years of service the sealed 1,024 Wh represents.
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 sourcemanuals.ecoflow.com ↗2026-07-27The 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.
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.
12.1 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
est.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 chemistry
LiFePO4. Show source
claimed sourcemanuals.ecoflow.com ↗- Rated capacity
1,024 Wh. Show source
claimed sourcemanuals.ecoflow.com ↗
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.
Power output
- Continuous power output
1,800 W. Show source
claimed sourcemanuals.ecoflow.com ↗- Surge power output
3,600 W. Show source
claimed sourcemanuals.ecoflow.com ↗- USB-A ports
1 ports. Show source
claimed sourcemanuals.ecoflow.com ↗- USB-C ports
2 ports. Show source
claimed sourcemanuals.ecoflow.com ↗- USB-C max output
100 W. Show source
claimed sourcemanuals.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 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.
Charging & solar
- AC recharge speed
1,400 W. Show source
claimed sourcemanuals.ecoflow.com ↗- Max solar input
500 W. Show source
claimed sourcemanuals.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
10 ms. Show source
claimed sourcemanuals.ecoflow.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
12.1 kg. Show source
claimed sourcemanuals.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.
What else to consider instead of the EcoFlow DELTA 3 Classic (1024Wh)
Same or adjacent size class, ordered by the price-independent composite. Every alternative is better than the EcoFlow DELTA 3 Classic (1024Wh) 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
- The EcoFlow DELTA 3 Classic (1024Wh) reaches a full AC charge in 44 minutes against 56.
- 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
- The EcoFlow DELTA 3 Classic (1024Wh) is 14% lighter (12.1 kg vs 14 kg).
- 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
- Nothing the sourced data can show — the EcoFlow DELTA 3 Classic (1024Wh) leads on no compared dimension by a margin worth acting on.
- EcoFlow DELTA 3score 68 · same size class
- Why you would switch
- The EcoFlow DELTA 3 supports add-on batteries, so capacity can grow later.
- What you give up
- The EcoFlow DELTA 3 Classic (1024Wh) reaches a full AC charge in 44 minutes against 56.
- 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 Classic (1024Wh) reaches a full AC charge in 44 minutes against 70.
Quick answers
Each answer restates a sourced figure from elsewhere on this page — nothing new, nothing guessed.
- How much does the EcoFlow DELTA 3 Classic (1024Wh) weigh?
- 12.1 kg (26.7 lb), manufacturer-claimed, without accessories.
- What are the dimensions of the EcoFlow DELTA 3 Classic (1024Wh)?
- 398 × 200 × 283 mm (15.7 × 7.9 × 11.1 in), length × width × height, manufacturer-claimed.
- How much capacity does the EcoFlow DELTA 3 Classic (1024Wh) 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).
- How many watts can the EcoFlow DELTA 3 Classic (1024Wh) output?
- 1,800 W continuous AC output and 3,600 W surge output, manufacturer-claimed. Appliance startup demand must stay within the relevant limit.
- How much solar input can the EcoFlow DELTA 3 Classic (1024Wh) accept?
- 500 W maximum solar input, manufacturer-claimed. Actual harvest depends on panel compatibility, sun, orientation, temperature, and conversion losses.
- Can the EcoFlow DELTA 3 Classic (1024Wh) 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.