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ecoflow
EcoFlow DELTA 3 Ultra
9.2/10 Excellent
In-depth EcoFlow DELTA 3 Ultra review. 4,096Wh LiFePO4 capacity, 4,000W output, 56-min fast charge. Real-world testing for RV, cabin, and home backup.
$2,999
Check Price on EcoFlow $3,699
Save $700
Last updated: 2026-04-08
Score Breakdown
Power 9.5/10
Portability 7.0/10
Value 8.5/10
Features 9.0/10
Build Quality 9.0/10
Pros & Cons
What We Like
- Massive 4,096Wh capacity with LiFePO4 longevity
- 56-minute fast charging to 80%
- Expandable up to 46kWh for whole-home backup
- 4,000W continuous / 8,000W surge handles any appliance
- Smart app control with real-time monitoring
Watch Out For
- 75 lbs — requires two people to move
- Premium price point at $3,699 MSRP
- Large footprint takes significant floor space
Full Specifications
| Capacity | 4,096Wh |
| AC Output | 4,000W |
| Surge Output | 8,000W |
| Weight | 75lbs |
| Dimensions | 25.6 x 11.4 x 13.4 in |
| Battery Type | LiFePO4 |
| Cycle Life | 4,000 cycles |
| AC Charge Time | 56 min (0-80%) |
| Max Solar Input | 2400W |
| AC Outlets | 6 |
| USB-C Ports | 2 |
| USB-A Ports | 2 |
| DC Outlets | 2 |
| Expandable | Yes |
| Max Expanded | 46,080Wh |
| Operating Temp | 32-113F |
| Warranty | 5 years |
| App Control | Yes |
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