Anker 521 PowerHouse vs EcoFlow DELTA Max 2000
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 $850 less. Whether that gap is worth closing depends on what you need to run.
- EcoFlow DELTA Max 2000 holds 688% more energy (2016Wh vs 256Wh), so it runs the same load proportionally longer.
- EcoFlow DELTA Max 2000 has 3100W more surge headroom (3400W vs 300W) — that decides whether a fridge, pump or AC compressor will actually start.
- Anker 521 PowerHouse is 39.8 lb lighter (8.2 lb vs 48 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 Max 2000. 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
The previous-generation 2kWh EcoFlow. Still capable and expandable, but its NMC cells and 800-cycle rating are a real step below the LiFePO4 DELTA 3 that replaced it.
Best for: Only at a steep discount against the DELTA 3 Max.
Where it falls short:
- NMC — roughly 800 cycles vs 4,000 for the DELTA 3 Max
- 2-year warranty
| Spec | Anker 521 PowerHouse | EcoFlow DELTA Max 2000 |
|---|---|---|
| Price | $249 | $1099 |
| Capacity | 256 Wh | 2016 Wh |
| Continuous output | 200 W | 2400 W |
| Surge output | 300 W | 3400 W |
| Battery | LiFePO4 | NMC |
| Rated cycles | 3,000 | 800 |
| Weight (lighter wins) | 8.2 lb | 48 lb |
| Max solar | 100 W | 800 W |
| Recharge time (faster wins) | 2h 30m | 1h 48m |
Runtime head-to-head
| Appliance | Anker 521 PowerHouse | EcoFlow DELTA Max 2000 |
|---|---|---|
| Refrigerator | ❌ | 28.6 hrs |
| Mini fridge | ❌ | 54.4 hrs |
| Chest freezer | ❌ | 21.4 hrs |
| CPAP machine | 5.4 hrs | 42.8 hrs |
| Sump pump | ❌ | 2.1 hrs |