EcoFlow RIVER 2 Pro 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
Anker 521 PowerHouse costs $350 less. Whether that gap is worth closing depends on what you need to run.
- EcoFlow RIVER 2 Pro holds 200% more energy (768Wh vs 256Wh), so it runs the same load proportionally longer.
- EcoFlow RIVER 2 Pro has 1300W more surge headroom (1600W vs 300W) — that decides whether a fridge, pump or AC compressor will actually start.
- Anker 521 PowerHouse is 8.8 lb lighter (8.2 lb vs 17 lb).
Neither of these will start a sump pump or well pump — both surge below the ~3,400W those motors need. If home backup with pumps is your use case, look at higher-surge models instead of either of these.
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
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 Pro | Anker 521 PowerHouse |
|---|---|---|
| Price | $599 | $249 |
| Capacity | 768 Wh | 256 Wh |
| Continuous output | 800 W | 200 W |
| Surge output | 1600 W | 300 W |
| Battery | LiFePO4 | LiFePO4 |
| Rated cycles | 3,000 | 3,000 |
| Weight (lighter wins) | 17 lb | 8.2 lb |
| Max solar | 220 W | 100 W |
| Recharge time (faster wins) | 1h 10m | 2h 30m |
Runtime head-to-head
| Appliance | EcoFlow RIVER 2 Pro | Anker 521 PowerHouse |
|---|---|---|
| Refrigerator | 10.9 hrs | ❌ |
| Mini fridge | 20.7 hrs | ❌ |
| Chest freezer | 8.2 hrs | ❌ |
| CPAP machine | 16.3 hrs | 5.4 hrs |
| Sump pump | ❌ | ❌ |