Anker 521 PowerHouse vs EcoFlow DELTA 1300
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.
- EcoFlow DELTA 1300 holds 392% more energy (1260Wh vs 256Wh), so it runs the same load proportionally longer.
- EcoFlow DELTA 1300 has 3000W more surge headroom (3300W vs 300W) — that decides whether a fridge, pump or AC compressor will actually start.
- Anker 521 PowerHouse is 22.7 lb lighter (8.2 lb vs 30.9 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 1300. 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 original DELTA that put EcoFlow on the map. Fast-charging and high-surge for its day, but the NMC battery and lack of USB-C now show its age.
Best for: Bargain hunters who find it heavily discounted.
Where it falls short:
- NMC — ~800 cycles
- No USB-C PD
- 2-year warranty
| Spec | Anker 521 PowerHouse | EcoFlow DELTA 1300 |
|---|---|---|
| Price | $249 | $999 |
| Capacity | 256 Wh | 1260 Wh |
| Continuous output | 200 W | 1800 W |
| Surge output | 300 W | 3300 W |
| Battery | LiFePO4 | NMC |
| Rated cycles | 3,000 | 800 |
| Weight (lighter wins) | 8.2 lb | 30.9 lb |
| Max solar | 100 W | 400 W |
| Recharge time (faster wins) | 2h 30m | 1h 36m |
Runtime head-to-head
| Appliance | Anker 521 PowerHouse | EcoFlow DELTA 1300 |
|---|---|---|
| Refrigerator | ❌ | 17.9 hrs |
| Mini fridge | ❌ | 34.0 hrs |
| Chest freezer | ❌ | 13.4 hrs |
| CPAP machine | 5.4 hrs | 26.8 hrs |
| Sump pump | ❌ | ❌ |