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
3.7/5
For homeowners who want 240V backup that can grow into a whole-home battery, and who do not need the extra solar input of the F3800 Plus.
- 3,840 WhCapacity
- 6,000 WAC output
- 132.3 lbWeight
- LiFePO4Battery
- $0.57Price / Wh
Check price at AmazonCheck price at Anker$2,199.99
Price checked October 20, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Native 120/240V output runs well pumps, dryers and other 240V loads
- NEMA 14-50 outlet can plug straight into an RV or an EV charging cable
- Expands to about 27 kWh with add-on batteries, or 53.8 kWh with two units
- Usually several hundred dollars cheaper than the F3800 Plus
Cons
- 132.3 lb, so it moves on its wheels rather than by hand
- Delivered about 78% of rated capacity in the StorageReview test
- 1,800W AC charging means hours to refill 3.84 kWh from the wall
- Less solar input (2,400W) and no generator bypass, unlike the F3800 Plus
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 |
|---|---|---|---|
| StorageReview | 2,980 Wh | 78% | Full discharge until the inverter cut off; load not stated. Recharge from 0 to 100% took 4,930 Wh from the wall. |
Specifications
| Battery | |
|---|---|
| Rated capacity | 3,840 Wh |
| Tested usable capacity | 2,980 Wh (78%) |
| Chemistry | LiFePO4 |
| Cycle life | 3,000 to 80% |
| Expandable | Yes, up to 26,880 Wh |
| Output | |
| AC output | 6,000 W (9,000 W surge) |
| AC outlets | 8 total |
| 120V 20A outlets (NEMA 5-20R) | 6 |
| 120/240V 30A twist-lock (NEMA L14-30R) | 1 |
| 120/240V 50A outlet (NEMA 14-50R) | 1 |
| USB-C ports | 3 (up to 100 W each) |
| USB-A ports | 2 |
| 12 V car outlet | Yes |
| UPS / pass-through | Yes (20 ms switchover) |
| Charging | |
| AC charging | 1,800 W |
| Max solar input | 2,400 W |
| Solar input voltage | 11-60V, 2 inputs at 1200W each |
| Build | |
| Weight | 132.3 lb (60 kg) |
| Dimensions | 27.6 x 15.3 x 15.6 in |
| App | Anker app |
| Warranty | 5 years |
Alternatives in this size
EcoFlow DELTA Pro
#21 in Home backupFull review
A heavy 3.6kWh station built for home backup that can grow into a 25 kWh system. It still makes sense if you want that expansion path, but newer models give similar capacity for less.
Amazon $1,799 EcoFlow $1,799$1,799
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
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Reviews
- StorageReview: Anker SOLIX F3800
- The Solar Lab: Anker SOLIX F3800 Review
- Notebookcheck: Anker Solix F3800 hands-on review