EcoFlow DELTA 3 vs EcoFlow RIVER 2 Max
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 Max costs $350 less. Whether that gap is worth closing depends on what you need to run.
- EcoFlow DELTA 3 holds 100% more energy (1024Wh vs 512Wh), so it runs the same load proportionally longer.
- EcoFlow DELTA 3 has 2600W more surge headroom (3600W vs 1000W) — that decides whether a fridge, pump or AC compressor will actually start.
- EcoFlow RIVER 2 Max is 15.5 lb lighter (13.2 lb vs 28.7 lb).
- EcoFlow DELTA 3 is rated for 4,000 cycles vs 3,000 — meaningful if you cycle it daily.
EcoFlow DELTA 3
The 1kWh class got a serious upgrade here. 3600W surge at $649 beats the older DELTA 2 on every axis that matters.
Best for: Anyone about to buy a DELTA 2 — this is the same money for materially better specs.
Where it falls short:
- Still only 1024Wh
- Solar input unchanged at 500W
EcoFlow RIVER 2 Max
Double the River 2's capacity and output for $100 more. The sweet spot of EcoFlow's small line for anyone eyeing the occasional small appliance.
Best for: Campers who want headroom over a pure device charger without the size of a 1kWh unit.
Where it falls short:
- Still not enough output for heaters or compressors
- 220W solar input is modest
| Spec | EcoFlow DELTA 3 | EcoFlow RIVER 2 Max |
|---|---|---|
| Price | $649 | $299 |
| Capacity | 1024 Wh | 512 Wh |
| Continuous output | 1800 W | 500 W |
| Surge output | 3600 W | 1000 W |
| Battery | LiFePO4 | LiFePO4 |
| Rated cycles | 4,000 | 3,000 |
| Weight (lighter wins) | 28.7 lb | 13.2 lb |
| Max solar | 500 W | 220 W |
| Recharge time (faster wins) | 56 min | 1h |
Runtime head-to-head
| Appliance | EcoFlow DELTA 3 | EcoFlow RIVER 2 Max |
|---|---|---|
| Refrigerator | 14.5 hrs | 7.3 hrs |
| Mini fridge | 27.6 hrs | 13.8 hrs |
| Chest freezer | 10.9 hrs | 5.4 hrs |
| CPAP machine | 21.8 hrs | 10.9 hrs |
| Sump pump | 1.1 hrs | ❌ |