Anker 757 PowerHouse 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 $750 less. Whether that gap is worth closing depends on what you need to run.
- Anker 757 PowerHouse holds 380% more energy (1229Wh vs 256Wh), so it runs the same load proportionally longer.
- Anker 757 PowerHouse has 2100W more surge headroom (2400W vs 300W) — that decides whether a fridge, pump or AC compressor will actually start.
- Anker 521 PowerHouse is 35.7 lb lighter (8.2 lb vs 43.9 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.
Anker's older flagship, now a discount play. Solid and durable, but heavy for its capacity and outclassed on charge speed by the newer C-series.
Best for: Buyers who find it discounted below the newer Anker C1000.
Where it falls short:
- 43.9 lb for 1.2kWh is heavy
- 300W solar input is low
- Outclassed by the newer C1000
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 | Anker 757 PowerHouse | Anker 521 PowerHouse |
|---|---|---|
| Price | $999 | $249 |
| Capacity | 1229 Wh | 256 Wh |
| Continuous output | 1500 W | 200 W |
| Surge output | 2400 W | 300 W |
| Battery | LiFePO4 | LiFePO4 |
| Rated cycles | 3,000 | 3,000 |
| Weight (lighter wins) | 43.9 lb | 8.2 lb |
| Max solar | 300 W | 100 W |
| Recharge time (faster wins) | 1h 30m | 2h 30m |
Runtime head-to-head
| Appliance | Anker 757 PowerHouse | Anker 521 PowerHouse |
|---|---|---|
| Refrigerator | 17.4 hrs | ❌ |
| Mini fridge | 33.2 hrs | ❌ |
| Chest freezer | 13.1 hrs | ❌ |
| CPAP machine | 26.1 hrs | 5.4 hrs |
| Sump pump | ❌ | ❌ |