Anker SOLIX C800 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.
- Anker SOLIX C800 holds 200% more energy (768Wh vs 256Wh), so it runs the same load proportionally longer.
- Anker SOLIX C800 has 1300W more surge headroom (1600W vs 300W) — that decides whether a fridge, pump or AC compressor will actually start.
- Anker 521 PowerHouse is 16.7 lb lighter (8.2 lb vs 24.9 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.
The C1000's smaller sibling. Same fast-charging DNA at a lower price, but the 768Wh capacity puts it firmly in weekend-trip territory.
Best for: Campers and van-lifers powering electronics, lights and a mini fridge — not home backup.
Where it falls short:
- 300W solar input is low — slow to top off off-grid
- 1600W surge rules out most motor-driven appliances
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 SOLIX C800 | Anker 521 PowerHouse |
|---|---|---|
| Price | $599 | $249 |
| Capacity | 768 Wh | 256 Wh |
| Continuous output | 1200 W | 200 W |
| Surge output | 1600 W | 300 W |
| Battery | LiFePO4 | LiFePO4 |
| Rated cycles | 3,000 | 3,000 |
| Weight (lighter wins) | 24.9 lb | 8.2 lb |
| Max solar | 300 W | 100 W |
| Recharge time (faster wins) | 58 min | 2h 30m |
Runtime head-to-head
| Appliance | Anker SOLIX C800 | 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 | ❌ | ❌ |