The EcoFlow DELTA 3 Max Plus rates 3.7 among large portable power stations; the EcoFlow DELTA 3 Ultra rates 3.7 among home backup ones. The EcoFlow DELTA 3 Max Plus costs $150 less ($1,199 vs $1,349).
A 2kWh home-backup station with enough output for most household circuits and room to expand to 10 kWh. A good fit for buyers who want to start mid-size and grow later.
Amazon $1,199 EcoFlow $1,199A 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 $1,349Prices 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.
These two sit in different size classes (large and home backup), 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 Max Plus | EcoFlow DELTA 3 Ultra |
|---|---|---|
| Overall rating | 3.7/5 | 3.7/5 |
| Value 25% | 56 $0.59 per rated Wh | 79 $0.44 per rated Wh |
| Tested capacity 15% | 46 80% 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% | 79 3,000 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% | 87 93 Wh per kg (48.7 lb (22.1 kg)) | 89 94 Wh per kg (72.1 lb (32.7 kg)) |
| Solar input 5% | 40 1,000 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 |
| Tested by | Usable AC energy | Of rated | Conditions |
|---|---|---|---|
| StorageReview | 1,640 Wh | 80% | Full 100%-to-0% AC discharge; load not specified. Recharge took 2.33 kWh from the wall. Measured UPS switchover: 8 ms. |
No independent test published yet.
| EcoFlow DELTA 3 Max Plus | EcoFlow DELTA 3 Ultra | |
|---|---|---|
| Battery | ||
| Rated capacity | 2,048 Wh | 3,072 Wh |
| Tested usable capacity | 1,640 Wh (80%) | - |
| Chemistry | LiFePO4 | LiFePO4 |
| Expandable | Yes, up to 10,000 Wh | No |
| Output | ||
| AC output | 3,000 W (6,000 W surge) | 3,600 W (7,200 W surge) |
| Boost mode (resistive loads) | 3,800 W | 4,600 W |
| AC outlets | 4 total | 5 total |
| 120V 20A outlets (NEMA 5-20R) | 4 | 4 |
| RV 30A outlet (TT-30R) | - | 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 |
| DC5521 ports | 0 | - |
| UPS / pass-through | Yes (10 ms switchover) | Yes (10 ms switchover) |
| Charging | ||
| AC charging | 1,800 W | 1,800 W |
| Max solar input | 1,000 W | 800 W |
| Solar input voltage | 11-60V, 18A max (2 XT60i inputs) | - |
| Build | ||
| Weight | 48.7 lb (22.1 kg) | 72.1 lb (32.7 kg) |
| Dimensions | 19.4 x 9.5 x 12.0 in | 626 x 328 x 395 mm |
| App | EcoFlow app (Wi-Fi and Bluetooth) | EcoFlow app (Wi-Fi and Bluetooth) |
| Warranty | 5 years | 5 years |
