EcoFlow RIVER 2 Pro 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 RIVER 2 Pro costs $1200 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 5600W more surge headroom (7200W vs 1600W) — that decides whether a fridge, pump or AC compressor will actually start.
- EcoFlow RIVER 2 Pro is 66.8 lb lighter (17 lb vs 83.8 lb).
- EcoFlow DELTA 3 Ultra is rated for 4,000 cycles vs 3,000 — meaningful if you cycle it daily.
The one you actually carry. At 17 lb it is light enough for one hand, yet unlike the true pocket units it has the 800W of output needed to run small appliances rather than just charge devices.
Best for: Backpackers, photographers and festival-goers who care about weight above all.
Where it falls short:
- 800W output limits you to electronics and small loads
- 220W solar input means slow off-grid top-ups
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 RIVER 2 Pro | EcoFlow DELTA 3 Ultra |
|---|---|---|
| Price | $599 | $1799 |
| Capacity | 768 Wh | 3072 Wh |
| Continuous output | 800 W | 3600 W |
| Surge output | 1600 W | 7200 W |
| Battery | LiFePO4 | LiFePO4 |
| Rated cycles | 3,000 | 4,000 |
| Weight (lighter wins) | 17 lb | 83.8 lb |
| Max solar | 220 W | 800 W |
| Recharge time (faster wins) | 1h 10m | 1h 30m |
Runtime head-to-head
| Appliance | EcoFlow RIVER 2 Pro | EcoFlow DELTA 3 Ultra |
|---|---|---|
| Refrigerator | 10.9 hrs | 43.5 hrs |
| Mini fridge | 20.7 hrs | 82.9 hrs |
| Chest freezer | 8.2 hrs | 32.6 hrs |
| CPAP machine | 16.3 hrs | 65.3 hrs |
| Sump pump | ❌ | 3.3 hrs |