EcoFlow DELTA 3 Ultra vs Bluetti AC70
Side-by-side on the specs that decide it — surge, capacity, runtime and price.
Both models' specs verified against manufacturer listings · Last updated
The short answer
Bluetti AC70 costs $1300 less. Whether that gap is worth closing depends on what you need to run.
- EcoFlow DELTA 3 Ultra holds 300% more energy (3072Wh vs 768Wh), so it runs the same load proportionally longer.
- EcoFlow DELTA 3 Ultra has 5200W more surge headroom (7200W vs 2000W) — that decides whether a fridge, pump or AC compressor will actually start.
- Bluetti AC70 is 61.8 lb lighter (22 lb vs 83.8 lb).
- EcoFlow DELTA 3 Ultra is rated for 4,000 cycles vs 3,000 — meaningful if you cycle it daily.
EcoFlow DELTA 3 Ultra
3kWh with 7200W surge at $1799 — this is whole-home territory at a mid-range price. The catch is the 800W solar input.
Best for: Grid-tied home backup where you recharge from the wall, not the sun.
Where it falls short:
- 800W solar input is low for 3kWh — slow off-grid refills
- 83.8 lb
Bluetti AC70
768Wh with 1000W output at $499 — it does what the EcoFlow River 2 Pro does, with more output and more weight.
Best for: Campers who need to run a small fridge, not just charge devices.
Where it falls short:
- 22 lb — 5 lb heavier than the River 2 Pro
- Not expandable
| Spec | EcoFlow DELTA 3 Ultra | Bluetti AC70 |
|---|---|---|
| Price | $1799 | $499 |
| Capacity | 3072 Wh | 768 Wh |
| Continuous output | 3600 W | 1000 W |
| Surge output | 7200 W | 2000 W |
| Battery | LiFePO4 | LiFePO4 |
| Rated cycles | 4,000 | 3,000 |
| Weight (lighter wins) | 83.8 lb | 22 lb |
| Max solar | 800 W | 500 W |
| Recharge time (faster wins) | 1h 30m | 1h 15m |
Runtime head-to-head
| Appliance | EcoFlow DELTA 3 Ultra | Bluetti AC70 |
|---|---|---|
| Refrigerator | 43.5 hrs | 10.9 hrs |
| Mini fridge | 82.9 hrs | 20.7 hrs |
| Chest freezer | 32.6 hrs | 8.2 hrs |
| CPAP machine | 65.3 hrs | 16.3 hrs |
| Sump pump | 3.3 hrs | ❌ |