EcoFlow DELTA 3 Max
#22 in LargeFull review
For buyers who want 2 kWh of fast-charging backup at a mid-range price and do not need heavy solar input.
Amazon $899 EcoFlow $899$899
3.6/5
A 1.5kWh LiFePO4 station with fast AC charging at a low price, good for home backup and RV use if you mostly recharge from the wall.
- 1,548 WhCapacity
- 1,500 WAC output
- 41.4 lbWeight
- LiFePO4Battery
- 1 hFull charge
- $0.38Price / Wh
Check price at VTOMAN$589
Price checked October 20, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Full recharge from the wall in about an hour with the built-in 1500W charger
- Delivered about 78% of rated capacity in an independent test, normal for this class
- Expands to 3,096Wh with an extra battery
- UPS mode for home office or network gear
Cons
- Solar input limited to 400W, low for a 1.5kWh battery
- Heavy at over 41 lb
- Sold mainly through VTOMAN’s own store; no Amazon listing for the base unit
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 |
|---|---|---|---|
| Techno-Science | 1,210 Wh | 78% | About 1,210Wh delivered into a ~1,040W hair-dryer load on the 230V EU version; recharge drew about 1,560Wh in roughly an hour. |
Specifications
| Battery | |
|---|---|
| Rated capacity | 1,548 Wh |
| Tested usable capacity | 1,210 Wh (78%) |
| Chemistry | LiFePO4 |
| Cycle life | 3,000 to 80% |
| Expandable | Yes, up to 3,096 Wh |
| Output | |
| AC output | 1,500 W (3,000 W surge) |
| AC outlets | 3 total |
| 120V 15A outlets (NEMA 5-15R) | 3 |
| USB-C ports | 2 (up to 100 W each) |
| USB-A ports | 4 |
| 12 V car outlet | Yes |
| DC5521 ports | 2 |
| UPS / pass-through | Yes (20 ms switchover) |
| Charging | |
| AC charging | 1,500 W |
| Full AC charge time | 1 h |
| Max solar input | 400 W |
| Solar input voltage | 30-60V (Anderson) |
| Car charging | 200 W |
| Build | |
| Weight | 41.4 lb (18.8 kg) |
| Dimensions | 15.5 x 11 x 10.6 in |
| Warranty | 2 years |
Alternatives in this size
EcoFlow DELTA 3 Max Plus
#23 in LargeFull review
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 $1,199$1,199
Anker SOLIX F1500
#25 in LargeFull review
For campers and RV owners who want a lot of LiFePO4 capacity for the money and can live with slower charging and extra weight.
Amazon $599.99 Anker SOLIX $599.99$599.99
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