BatteryRank scores the EcoFlow DELTA Pro Ultra X higher overall — 80 vs 59, though the other unit leads on livability.
- Best for Home backup: EcoFlow DELTA Pro Ultra X
- Best for Camping & RV: EcoFlow DELTA Pro Ultra
How they score
Computed from sourced data with a published, price-independent formula. Scores are relative to each model's size class.
Capacity truth
The watt-hours on the box aren't what reaches your devices. Same scale, both units.
The marketing number — total cell capacity.
What reaches an AC outlet — about 15% is lost turning battery power into household AC. How we estimate.
The marketing number — total cell capacity.
What reaches an AC outlet — about 15% is lost turning battery power into household AC. How we estimate.
Key specs, side by side
| Spec | EcoFlow DELTA Pro Ultra | EcoFlow DELTA Pro Ultra X |
|---|---|---|
| Usable capacity | 6,144 Wh | 12,288 Wh |
| Continuous power output | 7,200 W | 12,000 W |
| Surge power output | 10,800 W | — |
| Max solar input | 5,600 W | 10,000 W |
| Weight | 82.4 kg | 135.5 kg |
| Rated cycle life | 3,500 cycles | — |
Manufacturer-claimed unless marked verified (FCC/UL/DOE/lab). Hover any figure for its source.
Price & fair-price verdict
Each verdict compares today's price against that model's own tracked history — never MSRP theater.
Where these rank
- EcoFlow DELTA Pro Ultra X #1 XL / home backup in Best Portable Power Stations · #1 of 8 in Best for Home Backup