EcoFlow DELTA Pro Ultra
#15 in Home backupFull review
A modular 6kWh home-backup system for buyers who need 240V output and plan to expand. Overkill for camping or short outages.
Amazon $4,199$4,199
The EcoFlow DELTA Pro Ultra is the better portable power station overall, rated 3.8 to 3.7. The EcoFlow DELTA Pro Ultra leads on AC output, battery life and solar input. The EcoFlow DELTA 3 Ultra wins on value and portability. The EcoFlow DELTA 3 Ultra costs $2,850 less ($1,349 vs $4,199).
EcoFlow DELTA 3 Ultra
#22 in Home backupFull review
A wheeled 3kWh station for home backup or RV use at a lower price than its expandable sibling. Buy it if 3kWh is enough and you charge mostly from the wall.
Amazon $1,699 EcoFlow $1,349$1,349
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.
Which should you buy?
- Choose the EcoFlow DELTA Pro Ultra for AC output (7,200 W continuous AC vs 3,600 W continuous AC), battery life (LiFePO4, 3,500 cycles, 5-year warranty vs LiFePO4, 5-year warranty) and solar input (5,600 W max solar input vs 800 W max solar input).
- Choose the EcoFlow DELTA 3 Ultra for value ($0.44 per rated Wh vs $0.68 per rated Wh) and portability (94 Wh per kg (72.1 lb (32.7 kg)) vs 75 Wh per kg (181.8 lb (82.4 kg))).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every home backup portable power station; a clear win is highlighted. How we rank explains each one.
| Factor weight | EcoFlow DELTA Pro Ultra | EcoFlow DELTA 3 Ultra |
|---|---|---|
| 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% | 50 not yet independently tested (neutral score used) | 55 82% of rated capacity delivered (1 test) |
| Battery life 15% | 96 LiFePO4, 3,500 cycles, 5-year warranty | 70 LiFePO4, 5-year warranty |
| AC output 15% | 100 7,200 W continuous AC | 37 3,600 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% | 54 75 Wh per kg (181.8 lb (82.4 kg)) | 89 94 Wh per kg (72.1 lb (32.7 kg)) |
| Solar input 5% | 90 5,600 W max solar input | 13 800 W max solar input |
| Features 5% | 100 UPS (0 ms), expandable, 100 W USB-C, app | 75 UPS (10 ms), 140 W USB-C, app |
Independent capacity tests
EcoFlow DELTA Pro Ultra
No independent test published yet.
EcoFlow DELTA 3 Ultra
| Tested by | Usable AC energy | Of rated | Conditions |
|---|---|---|---|
| The Solar Lab | - | 82% | Efficiency test (load not stated in the review). Measured AC recharge 0-100% in 2 h from a standard household outlet. |
Specifications
| EcoFlow DELTA Pro Ultra | EcoFlow DELTA 3 Ultra | |
|---|---|---|
| Battery | ||
| Rated capacity | 6,144 Wh | 3,072 Wh |
| Tested usable capacity | - | 2,519 Wh (82%) |
| Chemistry | LiFePO4 | LiFePO4 |
| Cycle life | 3,500 to 80% | - |
| Expandable | Yes, up to 30,000 Wh | No |
| Output | ||
| AC output | 7,200 W (10,800 W surge) | 3,600 W (7,200 W surge) |
| Boost mode (resistive loads) | - | 4,600 W |
| AC outlets | 6 total | 5 total |
| 120V 20A outlets (NEMA 5-20R) | 4 | 4 |
| RV 30A outlet (TT-30R) | 1 | 1 |
| 120/240V 30A twist-lock (NEMA L14-30R) | 1 | - |
| AC waveform | Pure sine wave, 120/240V split phase | Pure sine wave |
| USB-C ports | 2 (up to 100 W each) | 3 (up to 140 W each) |
| USB-A ports | 2 | 1 |
| 12 V car outlet | - | Yes |
| DC5521 ports | 0 | 0 |
| UPS / pass-through | Yes (0 ms switchover) | Yes (10 ms switchover) |
| Charging | ||
| AC charging | - | 1,800 W |
| Max solar input | 5,600 W | 800 W |
| Solar input voltage | High-voltage 80-450V (4000W) and low-voltage 30-150V (1600W) | - |
| Build | ||
| Weight | 181.8 lb (82.4 kg) | 72.1 lb (32.7 kg) |
| Dimensions | Inverter 27.2 x 18.9 x 8.4 in; battery 26 x 18 x 8 in | 626 x 328 x 395 mm |
| App | EcoFlow app (Bluetooth, Wi-Fi and 4G) | EcoFlow app (Wi-Fi and Bluetooth) |
| Warranty | 5 years | 5 years |
| Released | 2024-01 | 2025-09 |