EcoFlow DELTA Pro Ultra
#13 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 EcoFlow $4,199$4,199
3.8/5
For households that want a single wheeled unit able to back up 240V circuits and expand toward whole-home capacity.
- 4,096 WhCapacity
- 4,000 WAC output
- 113.5 lbWeight
- LiFePO4Battery
- $0.68Price / Wh
Check price at Amazon$2,799Check price at EcoFlow$2,799
Price checked October 20, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- 4000W continuous with native 120/240V output via L14-30R, suitable for transfer-switch home backup
- Measured about 3790 Wh usable AC from 4096 Wh rated (92.5%)
- Up to 2600W solar input across high- and low-voltage ports
- Expands with extra batteries to about 12 kWh per unit
Cons
- About 114 lb; wheeled, but not practical to lift alone
- One of the most expensive units in the category
How it scores
The rating comes from 8 measured or published factors, each scored 0-100 against fixed reference points for its size. How we rank explains each one.
Independent capacity tests
Usable energy delivered from a full charge through the AC outlets, as measured by independent reviewers. Inverter losses mean no station delivers its full rated capacity.
| 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. |
Specifications
| Battery | |
|---|---|
| Rated capacity | 4,096 Wh |
| Tested usable capacity | 3,790 Wh (93%) |
| Chemistry | LiFePO4 |
| Cycle life | 4,000 to 80% |
| Expandable | Yes, up to 12,000 Wh |
| Output | |
| AC output | 4,000 W (8,000 W surge) |
| Boost mode (resistive loads) | 6,000 W |
| AC outlets | 7 total |
| 120V 20A outlets (NEMA 5-20R) | 4 |
| RV 30A outlet (TT-30R) | 1 |
| 120/240V 30A twist-lock (NEMA L14-30R) | 1 |
| 240V 20A outlet (NEMA 6-20R) | 1 |
| USB-C ports | 2 (up to 100 W each) |
| USB-A ports | 2 |
| DC5521 ports | 1 |
| UPS / pass-through | Yes (10 ms switchover) |
| Charging | |
| AC charging | 1,800 W |
| Max solar input | 2,600 W |
| Solar input voltage | HV 30-150V (1600W) + LV 11-60V (1000W) |
| Build | |
| Weight | 113.5 lb (51.5 kg) |
| Dimensions | 27.28 x 16.16 x 13.43 in |
| App | Wi-Fi + Bluetooth |
| Warranty | 5 years |
Alternatives in this size
Dabbsson DBS3500
#14 in Home backupFull review
For homeowners building a whole-circuit backup system who want 3.4 kWh now, fast solar charging and a path to 240V. It is too heavy to treat as a camping unit.
Amazon $2,537.88 Dabbsson $1,599$1,599
Anker SOLIX F3000
#16 in Home backupFull review
For RV and home-backup users who want 3 kWh and a TT-30R outlet at a lower price than the F3800 Plus.
Amazon $1,398.98 Anker $1,398.98$1,398.98
Compare
Compare the EcoFlow DELTA Pro 3 with any other portable power station →
More from EcoFlow: every EcoFlow product ranked.
Reviews
- OutdoorGearLab: EcoFlow DELTA Pro 3 Review
- TechRadar: EcoFlow DELTA Pro 3 portable power station review
- Bob Vila: EcoFlow DELTA Pro 3 Review
- CleanTechnica: EcoFlow DELTA Pro 3 Long-Term Review