EcoFlow DELTA 3
#16 in Mid-sizeFull review
A well-rounded 1kWh LiFePO4 station for home backup and car camping that charges from the wall in under an hour.
Amazon $629$629
The EcoFlow DELTA 3 rates 4.2 among mid-size portable power stations; the EcoFlow DELTA 3 Max rates 3.7 among large ones. The EcoFlow DELTA 3 costs $270 less ($629 vs $899).
EcoFlow DELTA 3 Max
#26 in LargeFull review
For buyers who want 2 kWh of fast-charging backup at a mid-range price and do not need heavy solar input.
Amazon $899$899
Prices were last checked October 24, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Scores side by side
These two sit in different size classes (mid-size and large), and each is scored against the reference points for its own class, so a rating says how well each does among its own size peers. How we rank explains each factor.
| Factor weight | EcoFlow DELTA 3 | EcoFlow DELTA 3 Max |
|---|---|---|
| Overall rating | 4.2/5 | 3.7/5 |
| Value 25% | 65 $0.61 per rated Wh | 79 $0.44 per rated Wh |
| Tested capacity 15% | 68 85% of rated capacity delivered (1 test) | 41 79% of rated capacity delivered (1 test) |
| Battery life 15% | 100 LiFePO4, 4,000 cycles, 5-year warranty | 70 LiFePO4, 5-year warranty |
| AC output 15% | 82 1,800 W continuous AC | 54 2,400 W continuous AC |
| Charging speed 10% | 97 0-100% on AC in 56 min | 50 full AC charge time not published (neutral score used) |
| Portability 10% | 67 82 Wh per kg (27.6 lb (12.5 kg)) | 100 101 Wh per kg (44.8 lb (20.3 kg)) |
| Solar input 5% | 40 500 W max solar input | 11 500 W max solar input |
| Features 5% | 100 UPS (10 ms), expandable, 100 W USB-C, app | 75 UPS (10 ms), 100 W USB-C, app |
Independent capacity tests
EcoFlow DELTA 3
| Tested by | Usable AC energy | Of rated | Conditions |
|---|---|---|---|
| OutdoorGearLab | 870 Wh | 85% | Light-bar load bank at roughly 80% of rated AC output, 100% to shutdown, measured at the AC outlet. |
EcoFlow DELTA 3 Max
| Tested by | Usable AC energy | Of rated | Conditions |
|---|---|---|---|
| The Solar Lab | - | 79% | Efficiency test (load not stated in the review). Measured AC recharge 0-100% in 68 min; idle draw 27W. |
Specifications
| EcoFlow DELTA 3 | EcoFlow DELTA 3 Max | |
|---|---|---|
| Battery | ||
| Rated capacity | 1,024 Wh | 2,048 Wh |
| Tested usable capacity | 870 Wh (85%) | 1,618 Wh (79%) |
| Chemistry | LiFePO4 | LiFePO4 |
| Cycle life | 4,000 to 80% | - |
| Expandable | Yes, up to 5,000 Wh | - |
| Output | ||
| AC output | 1,800 W (3,600 W surge) | 2,400 W (4,800 W surge) |
| Boost mode (resistive loads) | 2,200 W | 3,400 W |
| AC outlets | 6 total | 4 total |
| 120V 20A outlets (NEMA 5-20R) | 3 | 4 |
| 120V 2-prong outlets (NEMA 1-15R) | 3 | - |
| AC waveform | Pure sine wave | Pure sine wave |
| USB-C ports | 2 (up to 100 W each) | 3 (up to 100 W each) |
| USB-A ports | 2 | 1 |
| 12 V car outlet | Yes | Yes |
| DC5521 ports | 2 | 0 |
| UPS / pass-through | Yes (10 ms switchover) | Yes (10 ms switchover) |
| Charging | ||
| AC charging | 1,500 W | 1,800 W |
| Full AC charge time | 56 min | - |
| Max solar input | 500 W | 500 W |
| Solar input voltage | 11-60V | - |
| Car charging | 800 W | 96 W |
| Build | ||
| Weight | 27.6 lb (12.5 kg) | 44.8 lb (20.3 kg) |
| Dimensions | 15.7 x 8.0 x 11.2 in | 494 x 239 x 305 mm |
| App | EcoFlow app | Wi-Fi + Bluetooth |
| Warranty | 5 years | 5 years |
| Released | 2024-09 | 2025-09 |