EcoFlow DELTA 3 Ultra Plus
#20 in Home backupFull review
A wheeled 3kWh home-backup station that can grow to 11 kWh and charge fast from solar. The pick in this line for off-grid cabins and longer outages.
Amazon $1,599 EcoFlow $1,599$1,599
The EcoFlow DELTA 3 Ultra Plus and the EcoFlow DELTA 3 Ultra are evenly matched, rated 3.7 and 3.7. The EcoFlow DELTA 3 Ultra Plus leads on solar input and features. The EcoFlow DELTA 3 Ultra wins on value. The EcoFlow DELTA 3 Ultra costs $250 less ($1,349 vs $1,599).
EcoFlow DELTA 3 Ultra
#23 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 $1,349 EcoFlow $1,349$1,349
Prices were last checked October 20, 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 3 Ultra Plus for solar input (1,600 W max solar input vs 800 W max solar input) and features (UPS (10 ms), expandable, 140 W USB-C, app vs UPS (10 ms), 140 W USB-C, app).
- Choose the EcoFlow DELTA 3 Ultra for value ($0.44 per rated Wh vs $0.52 per rated Wh).
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 3 Ultra Plus | EcoFlow DELTA 3 Ultra |
|---|---|---|
| Overall rating | 3.7/5 | 3.7/5 |
| Value 25% | 66 $0.52 per rated Wh | 79 $0.44 per rated Wh |
| Tested capacity 15% | 68 85% of rated capacity delivered (1 test) | 50 not yet independently tested (neutral score used) |
| Battery life 15% | 70 LiFePO4, 5-year warranty | 70 LiFePO4, 5-year warranty |
| AC output 15% | 37 3,600 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% | 84 91 Wh per kg (74.3 lb (33.7 kg)) | 89 94 Wh per kg (72.1 lb (32.7 kg)) |
| Solar input 5% | 44 1,600 W max solar input | 13 800 W max solar input |
| Features 5% | 100 UPS (10 ms), expandable, 140 W USB-C, app | 75 UPS (10 ms), 140 W USB-C, app |
Independent capacity tests
EcoFlow DELTA 3 Ultra Plus
| Tested by | Usable AC energy | Of rated | Conditions |
|---|---|---|---|
| StorageReview | 2,610 Wh | 85% | Full 100%-to-0% AC discharge; load not specified. Recharge took 3.54 kWh from the wall. Measured UPS switchover: 8.25 ms. |
EcoFlow DELTA 3 Ultra
No independent test published yet.
Specifications
| EcoFlow DELTA 3 Ultra Plus | EcoFlow DELTA 3 Ultra | |
|---|---|---|
| Battery | ||
| Rated capacity | 3,072 Wh | 3,072 Wh |
| Tested usable capacity | 2,610 Wh (85%) | - |
| Chemistry | LiFePO4 | LiFePO4 |
| Expandable | Yes, up to 11,000 Wh | No |
| Output | ||
| AC output | 3,600 W (7,200 W surge) | 3,600 W (7,200 W surge) |
| Boost mode (resistive loads) | 4,600 W | 4,600 W |
| AC outlets | 5 total | 5 total |
| 120V 20A outlets (NEMA 5-20R) | 4 | 4 |
| RV 30A outlet (TT-30R) | 1 | 1 |
| USB-C ports | 3 (up to 140 W each) | 3 (up to 140 W each) |
| USB-A ports | 1 | 1 |
| 12 V car outlet | Yes | Yes |
| UPS / pass-through | Yes (10 ms switchover) | Yes (10 ms switchover) |
| Charging | ||
| AC charging | 1,800 W | 1,800 W |
| Max solar input | 1,600 W | 800 W |
| Solar input voltage | 11-60V (2 inputs) | - |
| Build | ||
| Weight | 74.3 lb (33.7 kg) | 72.1 lb (32.7 kg) |
| Dimensions | 613 x 328 x 395 mm | 626 x 328 x 395 mm |
| App | EcoFlow app (Wi-Fi and Bluetooth) | EcoFlow app (Wi-Fi and Bluetooth) |
| Warranty | 5 years | 5 years |