EcoFlow RIVER 2 vs Anker 521 PowerHouse
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 costs $50 less. Whether that gap is worth closing depends on what you need to run.
- EcoFlow RIVER 2 has 300W more surge headroom (600W vs 300W) — that decides whether a fridge, pump or AC compressor will actually start.
- EcoFlow RIVER 2 is 0.5 lb lighter (7.7 lb vs 8.2 lb).
We'd skip the Anker 521 PowerHouse in this matchup. It costs $50 more than the EcoFlow RIVER 2 while matching or trailing it on capacity, surge and cycle life — there's no spec here that justifies the premium.
The cheapest way into LiFePO4. 256Wh is a device charger, but at under $200 with a 60-minute recharge it's hard to argue with.
Best for: Budget campers who just need to keep phones, cameras and a laptop alive.
Where it falls short:
- 300W output runs devices only
- 256Wh is a single evening of real use
A pocket-scale LiFePO4 unit for keeping devices alive. 200W of output means it's a charger, not an appliance station.
Best for: Travelers and campers topping up phones, cameras and a laptop.
Where it falls short:
- 200W output runs devices only
- 256Wh is small
| Spec | EcoFlow RIVER 2 | Anker 521 PowerHouse |
|---|---|---|
| Price | $199 | $249 |
| Capacity | 256 Wh | 256 Wh |
| Continuous output | 300 W | 200 W |
| Surge output | 600 W | 300 W |
| Battery | LiFePO4 | LiFePO4 |
| Rated cycles | 3,000 | 3,000 |
| Weight (lighter wins) | 7.7 lb | 8.2 lb |
| Max solar | 110 W | 100 W |
| Recharge time (faster wins) | 1h | 2h 30m |
Runtime head-to-head
| Appliance | EcoFlow RIVER 2 | Anker 521 PowerHouse |
|---|---|---|
| Refrigerator | ❌ | ❌ |
| Mini fridge | 6.9 hrs | ❌ |
| Chest freezer | ❌ | ❌ |
| CPAP machine | 5.4 hrs | 5.4 hrs |
| Sump pump | ❌ | ❌ |