EcoFlow DELTA Pro 3
#16 in Home backupFull review
For households that want a single wheeled unit able to back up 240V circuits and expand toward whole-home capacity.
Amazon $2,799$2,799
The EcoFlow DELTA Pro 3 rates 3.8 among home backup portable power stations; the EcoFlow DELTA 3 Max rates 3.7 among large ones. The EcoFlow DELTA 3 Max costs $1,900 less ($899 vs $2,799).
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 (home backup 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 Pro 3 | EcoFlow DELTA 3 Max |
|---|---|---|
| Overall rating | 3.8/5 | 3.7/5 |
| Value 25% | 41 $0.68 per rated Wh | 79 $0.44 per rated Wh |
| Tested capacity 15% | 100 93% 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% | 46 4,000 W continuous AC | 54 2,400 W continuous AC |
| Charging speed 10% | 50 full AC charge time not published (neutral score used) | 50 full AC charge time not published (neutral score used) |
| Portability 10% | 63 80 Wh per kg (113.5 lb (51.5 kg)) | 100 101 Wh per kg (44.8 lb (20.3 kg)) |
| Solar input 5% | 57 2,600 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 Pro 3
| Tested by | Usable AC energy | Of rated | Conditions |
|---|---|---|---|
| OutdoorGearLab | 3,790 Wh | 92.5% | Full-discharge AC test; OutdoorGearLab states over 93%, 3790/4096 works out to 92.5%. Recharged from empty in about 3.2 h at about 1600W peak. |
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 Pro 3 | EcoFlow DELTA 3 Max | |
|---|---|---|
| Battery | ||
| Rated capacity | 4,096 Wh | 2,048 Wh |
| Tested usable capacity | 3,790 Wh (93%) | 1,618 Wh (79%) |
| Chemistry | LiFePO4 | LiFePO4 |
| Cycle life | 4,000 to 80% | - |
| Expandable | Yes, up to 12,000 Wh | - |
| Output | ||
| AC output | 4,000 W (8,000 W surge) | 2,400 W (4,800 W surge) |
| Boost mode (resistive loads) | 6,000 W | 3,400 W |
| AC outlets | 7 total | 4 total |
| 120V 20A outlets (NEMA 5-20R) | 4 | 4 |
| RV 30A outlet (TT-30R) | 1 | - |
| 120/240V 30A twist-lock (NEMA L14-30R) | 1 | - |
| 240V 20A outlet (NEMA 6-20R) | 1 | - |
| 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 |
| DC5521 ports | 1 | 0 |
| UPS / pass-through | Yes (10 ms switchover) | Yes (10 ms switchover) |
| Charging | ||
| AC charging | 1,800 W | 1,800 W |
| Max solar input | 2,600 W | 500 W |
| Solar input voltage | HV 30-150V (1600W) + LV 11-60V (1000W) | - |
| Car charging | 96 W | 96 W |
| Build | ||
| Weight | 113.5 lb (51.5 kg) | 44.8 lb (20.3 kg) |
| Dimensions | 27.28 x 16.16 x 13.43 in | 494 x 239 x 305 mm |
| App | Wi-Fi + Bluetooth | Wi-Fi + Bluetooth |
| Warranty | 5 years | 5 years |
| Released | 2024-06 | 2025-09 |