Anker 555 PowerHouse vs Growatt VITA 550
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
Growatt VITA 550 costs $300 less. Whether that gap is worth closing depends on what you need to run.
- Anker 555 PowerHouse holds 90% more energy (1024Wh vs 538Wh), so it runs the same load proportionally longer.
- Anker 555 PowerHouse has 300W more surge headroom (1500W vs 1200W) — that decides whether a fridge, pump or AC compressor will actually start.
- Growatt VITA 550 is 12.3 lb lighter (17.6 lb vs 29.9 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.
A 1kWh unit whose 1,000W output and slow charging show its age — the newer, cheaper Anker C1000 beats it on nearly every axis.
Best for: Only worth it steeply discounted against the C1000.
Where it falls short:
- 1,500W surge is low
- 200W solar input and a slow 138-minute recharge
A tidy half-kWh unit with fast charging and a 1,200W surge that lets it start small appliances a 600W rating wouldn't suggest.
Best for: Campers who want fast charging and a bit of surge headroom at half a kWh.
Where it falls short:
- 538Wh is weekend-scale
- 3-year warranty
| Spec | Anker 555 PowerHouse | Growatt VITA 550 |
|---|---|---|
| Price | $699 | $399 |
| Capacity | 1024 Wh | 538 Wh |
| Continuous output | 1000 W | 600 W |
| Surge output | 1500 W | 1200 W |
| Battery | LiFePO4 | LiFePO4 |
| Rated cycles | 3,000 | 3,000 |
| Weight (lighter wins) | 29.9 lb | 17.6 lb |
| Max solar | 200 W | 300 W |
| Recharge time (faster wins) | 2h 18m | 1h |
Runtime head-to-head
| Appliance | Anker 555 PowerHouse | Growatt VITA 550 |
|---|---|---|
| Refrigerator | 14.5 hrs | 7.6 hrs |
| Mini fridge | 27.6 hrs | 14.5 hrs |
| Chest freezer | 10.9 hrs | 5.7 hrs |
| CPAP machine | 21.8 hrs | 11.4 hrs |
| Sump pump | ❌ | ❌ |