EcoFlow River 3 vs Anker 521 PowerHouse
A spec-by-spec breakdown to settle it. Prices and value metric (cost per usable Wh) included.
| EcoFlow River 3 |
Anker 521 PowerHouse |
|
|---|---|---|
| Price | — | $186 |
| Battery capacity | 245 Wh | 256 Wh |
| Usable capacity | 221 Wh | 230 Wh |
| Real usable at outlet (AC) | 188 Wh | 196 Wh |
| AC output (continuous) | 300 W | 200 W |
| Surge output | 600 W | 400 W |
| Battery chemistry | LiFePO4 | LiFePO4 |
| Rated cycle life | 3000 cycles | 3000 cycles |
| Max solar input | 110 W | 100 W |
| Expandable | No | No |
| Weight | 7.7 lb | 8.2 lb |
| Warranty | 5 yrs | 5 yrs |
| Cost per usable Wh | — | $0.813/Wh |
| Check price → | Check price → |
Bottom line
For pure value, the Anker 521 PowerHouse wins on cost per usable Wh. Need the most capacity? The Anker 521 PowerHouse holds 256 Wh. Prioritizing portability? The EcoFlow River 3 is lighter at 7.7 lb. Match the choice to how you scored on the sizing calculator.
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