EcoFlow DELTA 2 Max vs EcoFlow DELTA 3 Ultra
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
EcoFlow DELTA 2 Max costs $200 less. Whether that gap is worth closing depends on what you need to run.
- EcoFlow DELTA 3 Ultra holds 50% more energy (3072Wh vs 2048Wh), so it runs the same load proportionally longer.
- EcoFlow DELTA 3 Ultra has 2400W more surge headroom (7200W vs 4800W) — that decides whether a fridge, pump or AC compressor will actually start.
- EcoFlow DELTA 2 Max is 33.8 lb lighter (50 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 2 Max
The surge sleeper. At 4800W it starts loads that stations twice its price can't — and most spec sheets bury that number behind the X-Boost figure.
Best for: Home backup where something with a compressor — fridge, freezer, window AC — has to start reliably.
Where it falls short:
- 50 lb is heavy for its capacity
- Marketing leads with the 3400W X-Boost number, which understates it
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
| Spec | EcoFlow DELTA 2 Max | EcoFlow DELTA 3 Ultra |
|---|---|---|
| Price | $1599 | $1799 |
| Capacity | 2048 Wh | 3072 Wh |
| Continuous output | 2400 W | 3600 W |
| Surge output | 4800 W | 7200 W |
| Battery | LiFePO4 | LiFePO4 |
| Rated cycles | 3,000 | 4,000 |
| Weight (lighter wins) | 50 lb | 83.8 lb |
| Max solar | 1000 W | 800 W |
| Recharge time (faster wins) | 1h 30m | 1h 30m |
Runtime head-to-head
| Appliance | EcoFlow DELTA 2 Max | EcoFlow DELTA 3 Ultra |
|---|---|---|
| Refrigerator | 29.0 hrs | 43.5 hrs |
| Mini fridge | 55.3 hrs | 82.9 hrs |
| Chest freezer | 21.8 hrs | 32.6 hrs |
| CPAP machine | 43.5 hrs | 65.3 hrs |
| Sump pump | 2.2 hrs | 3.3 hrs |