Anker 521 PowerHouse vs EcoFlow DELTA mini
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 DELTA mini holds 245% more energy (882Wh vs 256Wh), so it runs the same load proportionally longer.
- EcoFlow DELTA mini has 1800W more surge headroom (2100W vs 300W) — that decides whether a fridge, pump or AC compressor will actually start.
- Anker 521 PowerHouse is 15.4 lb lighter (8.2 lb vs 23.6 lb).
- Anker 521 PowerHouse uses LiFePO4 while the other uses NMC — roughly double the usable cycle life.
- Anker 521 PowerHouse is rated for 3,000 cycles vs 800 — meaningful if you cycle it daily.
If you plan to cycle the battery daily, think twice about the EcoFlow DELTA mini. Its NMC cells are rated for 800 cycles against the LiFePO4 rival's longer life — over years of regular use that's the more expensive unit, whatever the sticker says.
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
A compact NMC unit with a surprisingly strong 1,400W output for its size — but the 800-cycle battery means it won't age like the LiFePO4 field.
Best for: Buyers who want strong output in a light unit and won’t cycle it daily.
Where it falls short:
- NMC — ~800 cycles
- 2-year warranty, 300W solar input
| Spec | Anker 521 PowerHouse | EcoFlow DELTA mini |
|---|---|---|
| Price | $249 | $599 |
| Capacity | 256 Wh | 882 Wh |
| Continuous output | 200 W | 1400 W |
| Surge output | 300 W | 2100 W |
| Battery | LiFePO4 | NMC |
| Rated cycles | 3,000 | 800 |
| Weight (lighter wins) | 8.2 lb | 23.6 lb |
| Max solar | 100 W | 300 W |
| Recharge time (faster wins) | 2h 30m | 1h 36m |
Runtime head-to-head
| Appliance | Anker 521 PowerHouse | EcoFlow DELTA mini |
|---|---|---|
| Refrigerator | ❌ | 12.5 hrs |
| Mini fridge | ❌ | 23.8 hrs |
| Chest freezer | ❌ | 9.4 hrs |
| CPAP machine | 5.4 hrs | 18.7 hrs |
| Sump pump | ❌ | ❌ |