EcoFlow DELTA Pro 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 $2950 less. Whether that gap is worth closing depends on what you need to run.
- EcoFlow DELTA Pro holds 1306% more energy (3600Wh vs 256Wh), so it runs the same load proportionally longer.
- EcoFlow DELTA Pro has 6900W more surge headroom (7200W vs 300W) — that decides whether a fridge, pump or AC compressor will actually start.
- Anker 521 PowerHouse is 90.8 lb lighter (8.2 lb vs 99 lb).
- EcoFlow DELTA Pro is rated for 3,500 cycles vs 3,000 — meaningful if you cycle it daily.
EcoFlow DELTA Pro
The previous-generation flagship, now mostly worth buying on discount. The Pro 3 beats it on nearly every axis.
Best for: Bargain hunters who find it steeply discounted against the Pro 3.
Where it falls short:
- 99 lb and 165-minute recharge — both beaten by the Pro 3
- Aging platform; expect it to be phased out
Anker 521 PowerHouse
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 | EcoFlow DELTA Pro | Anker 521 PowerHouse |
|---|---|---|
| Price | $3199 | $249 |
| Capacity | 3600 Wh | 256 Wh |
| Continuous output | 3600 W | 200 W |
| Surge output | 7200 W | 300 W |
| Battery | LiFePO4 | LiFePO4 |
| Rated cycles | 3,500 | 3,000 |
| Weight (lighter wins) | 99 lb | 8.2 lb |
| Max solar | 1600 W | 100 W |
| Recharge time (faster wins) | 2h 45m | 2h 30m |
Runtime head-to-head
| Appliance | EcoFlow DELTA Pro | Anker 521 PowerHouse |
|---|---|---|
| Refrigerator | 51.0 hrs | ❌ |
| Mini fridge | 97.1 hrs | ❌ |
| Chest freezer | 38.3 hrs | ❌ |
| CPAP machine | 76.5 hrs | 5.4 hrs |
| Sump pump | 3.8 hrs | ❌ |