EcoFlow DELTA 2 (EFD330)
The short answer
This is a 1,024Wh battery with 1,800W of output, which means it stores about 870 watt-hours you can actually use and can run anything drawing up to 1,800 watts at once.
It runs indoors and makes no fumes. Of the 15 household loads we track, it can handle 13. It would keep a refrigerator going for 1.2–8.7 hours.
Check you have the right model
EcoFlow sells other models that can be mistaken for this one:
- EcoFlow DELTA 3 Plus. same battery size and same output as this one; peak output 3,600W instead of 2,700W.
- EcoFlow DELTA 2 Max — they differ by a single word: MAX against EFD330. peak output 4,800W instead of 2,700W.
- EcoFlow DELTA 3 Classic (1024Wh). same battery size and same output as this one; peak output 3,600W instead of 2,700W.
- EcoFlow DELTA 3. same battery size and same output as this one; peak output 3,600W instead of 2,700W.
Read the full model name off the label on the unit itself, not off the box or the listing. The figures on this page apply only to the exact name in the heading above.
Power and battery figures published by the maker. We have not yet researched the rest of this model.
Judged in: EcoFlow DELTA 3 vs DELTA 2: what changed, and which one to buy.
Specifications only
We have the maker's power and battery figures, so the planner can size it. We have not yet checked the manual, the solar and wall-charging limits, extra batteries, the warranty, the official add-ons, or safety recalls.
Treat this as a model to research, not one we vouch for. The fully researched models have all of that.
What it can run
| Load | Draw | Runtime | Verdict |
|---|---|---|---|
| Wi-Fi router and modem | 15–40W | 21.8–58.0h | Might work |
| Phone charging and small USB devices | 10–40W | 21.8–87.0h | Will work |
| A few LED lights | 15–80W | 10.9–58.0h | Will work |
| Laptop and monitor | 45–150W | 5.8–19.3h | Might work |
| CPAP | 30–100W | 8.7–29.0h | Will work |
| Refrigerator/freezer | 100–700W | 1.2–8.7h | Might work |
| Chest freezer | 80–500W | 1.7–10.9h | Might work |
| Sump pump | 700–1,500W | 0.6–1.2h | Might work |
| Microwave | 800–1,800W | 0.5–1.1h | Might work |
| Coffee maker | 700–1,500W | 0.6–1.2h | Might work |
| Television | 40–250W | 3.5–21.8h | Might work |
| Garage door opener | 300–800W | 1.1–2.9h | Will work |
| 12 V compressor fridge (camping) | 25–110W | 7.9–34.8h | Might work |
The two numbers are how long it lasts if your appliances are efficient, and if they are not. Sized over a 24-hour outage.
Living with it
What the maker’s own pages and manual say about owning this unit, and what owners report in public. Each line links to where it was read. Nothing here is our own test.
- Switchover when the grid drops
- ≈30 ms EPS/UPS switchover on grid loss (maker states this is NOT a 0ms UPS, not for servers/data equipment)websiteoss.ecoflow.com
- Pass-through charging
- Supports bypass/pass-through: while charging via AC with AC output also on, connected devices draw power directly from the grid rather than the batterywebsiteoss.ecoflow.com
- Wall recharge
- 0-80% in 50 min via X-Stream AC fast charging (maker product-page claim, likely with 1,200W input); manual states a full recharge takes ≈1.2 hrs using the included AC cableecoflow.com
- AC input
- 1,200W max AC input (X-Stream fast charging); 100-120V~ 50/60Hzwebsiteoss.ecoflow.com
- USB-C
- 100W max per USB-C port; 200W total across both USB-C portswebsiteoss.ecoflow.com
- Outlets and ports
- 6x AC outlets (1,800W total, 2,700W surge); 2x USB-A (12W each/24W total); 2x USB-A fast charge (18W each/36W total); 2x USB-C (100W each/200W total); 1x car outlet (126W max, shared with DC5521); 2x DC5521 (38W each)websiteoss.ecoflow.com
- Charges between
- 0°C to 45°C (32°F to 113°F)websiteoss.ecoflow.com
- Runs between
- -10°C to 45°C (14°F to 113°F)websiteoss.ecoflow.com
- Cycle life
- 3,000 cycles to 80%+ remaining capacity (LFP cells)websiteoss.ecoflow.com
- Low-load shutoff
- Defaults to auto-shutoff after 2 hours with no load and output buttons off (adjustable in app); AC output also auto-shuts after 12 hours with no AC loadwebsiteoss.ecoflow.com
- Size
- 15.7 x 8.3 x 11.1 in (400 x 211 x 281 mm)websiteoss.ecoflow.com
- Weight
- ≈27 lb (12 kg)websiteoss.ecoflow.com
- Warranty
- 5-year warrantyecoflow.com
What owners report, from public threads and long-term reviews; not our own testing.
- A PCWorld reviewer measured fan noise at about 57 dBA from three feet away during max 1,200W AC charging and described the fan tone as small and shrill, calling it the unit's biggest annoyance.pcworld.com
- The same reviewer noted the fans kick on at surprisingly low discharge loads (above roughly 120W), which is disruptive for use cases like powering bedroom medical equipment quietly.pcworld.com
- EcoFlow pushed two firmware updates to the reviewer's unit right out of the box and told the reviewer a future update would specifically target fan noise, which the reviewer read as a sign of active ongoing support.pcworld.com
- A 6-month long-term tester at Portable Power Lab reported no measurable capacity degradation after 150+ charge cycles, and said the unit still felt as structurally solid as day one.portablepowerlab.com
- That same long-term tester measured fan noise scaling with load, from near-silent (~20-22 dB) under light loads under 50W up to ~48-55 dB at maximum 1,000-1,800W draw, and rated it as comparatively quiet for its class at typical (non-max) loads -- a milder noise picture than the PCWorld reviewer reported at max charging.portablepowerlab.com
- Multiple review sites comparing the DELTA 2 to the newer DELTA 3 frame the upgrade as worthwhile mainly for owners who specifically need alternator charging, a higher surge ceiling, or larger battery expansion, and otherwise recommend sticking with the cheaper DELTA 2 since base AC charging speed and output are comparable between the two generations.backuppowerhub.com
- Fan noise is the most consistently cited complaint for the DELTA 2, particularly during high-power AC charging (measured as loud/shrill by one reviewer at ~57 dBA), and fans can trigger at loads as low as ~120W; EcoFlow acknowledged this and said a firmware update would target it.pcworld.com
- Compared to the newer DELTA 3, the DELTA 2 lacks alternator charging support, tops out at a lower X-Boost surge ceiling (2,200W vs the DELTA 3's 3,600W), and has a smaller maximum expansion capacity (3kWh with one extra battery vs 5kWh) -- cited by reviewers as the concrete gaps that would push a buyer toward the newer model.backuppowerhub.com
What independent testers measured
We do not test units ourselves. These are figures published by testers who did, with the maker’s claim beside them where the tester gave it.
| Measurement | Result | Tester |
|---|---|---|
| Noise under load, measured | 45-50 dB fan noise noticeable under heavy load | Power Station Advisor |
| Wall charge, to 80% | Reached 80% in roughly 48-52 minutes per the tester's own verified benchmarks (maker: EcoFlow's rated spec of 0-80% in 50 minutes) | Power Station Advisor |
| Weight, measured | 27 lb, described by the tester from hands-on handling as substantial but one-hand-carryable (maker: 27 lb manufacturer spec) | Power Station Advisor |
| Also measured | Powered an 18 cu ft refrigerator for 8-10 hours in the tester's own real-world test | Power Station Advisor |
- After 18 months of testing, named a top recommendation and 'Best Overall Portable Power Station' / 'Our Top Pick' in its class. (Best Overall Portable Power Station) Power Station Advisor
- The better choice versus the DELTA 2 Max for individuals or couples who prioritize portability and essential backup without overspending. Power Station Advisor
Specifications
- Capacity
- 1,024Wh nameplate · 870Wh assumed usable
- Continuous output
- 1,800W
- Surge output
- 2,700W
- Output voltage
- 120V
- Weight
- 12kg
- Solar input
- not captured
- AC recharge
- not captured
- Expansion battery
- not captured
- Warranty
- not captured
- Generator recharge
- not captured
Recall screen
Not screened
No recall screen recorded for this product.
No manufacturer recall-lookup URL is captured for this brand. Use the CPSC recall search.
Buying the right one
Verified listing — the bare unit
EF ECOFLOW Portable Power Station Delta 2, 1024Wh, 1800W, LiFePO4 Battery
ASIN B0B9XB57XM · $699.00 when checked on 2026-08-13 · purchasable
Title states 1024Wh and 1800W, matching our record exactly. A price is not a product attribute: treat this as the figure at capture time, not today's price.
Some links on this page are affiliate links. If you buy through one we may earn a commission, at no extra cost to you. It does not affect which products the planner recommends: rankings come from the sizing rules on our methodology page, and a product with unresolved safety identity is never ranked or linked regardless of commission.
Listings we rejected
Searching for this model returns bundles, sibling models and refurbished units alongside the bare product. These are the ones we checked and did not link, with the reason.
| Listing | Price | Why it is not this product |
|---|---|---|
| EF ECOFLOW Portable Power Station DELTA 2 Max 2048Wh, 2400W LiFePO4 Battery | $1,049 | Listing is the 'DELTA 2 Max' variant, which is a different product from the 'DELTA 2' in our record. |
| EF ECOFLOW Solar Generator Delta 2 with 220W Solar Panel, 1024Wh 1800W | $1,136 | Listing is a bundle (solar panel or kit), not the bare base unit our specifications describe. |
| EF ECOFLOW Portable Power Station Delta 3 Classic, 1024Wh 1800W AC | $559 | Listing title does not contain the model name 'DELTA 2'. |
| AC Power Cord Replacement for EF EcoFlow Delta 2 Portable Power Station Solar Ge | $16 | Listing is a bundle (solar panel or kit), not the bare base unit our specifications describe. |
| Power Station Charging Cable Cord for EF EcoFlow Delta 2,Delta 2 Max,Delta pro P | $15 | Listing is a bundle (solar panel or kit), not the bare base unit our specifications describe. |