EcoFlow DELTA Max 2000 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 $700 less. Whether that gap is worth closing depends on what you need to run.
- EcoFlow DELTA Max 2000 holds 275% more energy (2016Wh vs 538Wh), so it runs the same load proportionally longer.
- EcoFlow DELTA Max 2000 has 2200W more surge headroom (3400W vs 1200W) — that decides whether a fridge, pump or AC compressor will actually start.
- Growatt VITA 550 is 30.4 lb lighter (17.6 lb vs 48 lb).
- Growatt VITA 550 uses LiFePO4 while the other uses NMC — roughly double the usable cycle life.
- Growatt VITA 550 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.
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
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 | EcoFlow DELTA Max 2000 | Growatt VITA 550 |
|---|---|---|
| Price | $1099 | $399 |
| Capacity | 2016 Wh | 538 Wh |
| Continuous output | 2400 W | 600 W |
| Surge output | 3400 W | 1200 W |
| Battery | NMC | LiFePO4 |
| Rated cycles | 800 | 3,000 |
| Weight (lighter wins) | 48 lb | 17.6 lb |
| Max solar | 800 W | 300 W |
| Recharge time (faster wins) | 1h 48m | 1h |
Runtime head-to-head
| Appliance | EcoFlow DELTA Max 2000 | Growatt VITA 550 |
|---|---|---|
| Refrigerator | 28.6 hrs | 7.6 hrs |
| Mini fridge | 54.4 hrs | 14.5 hrs |
| Chest freezer | 21.4 hrs | 5.7 hrs |
| CPAP machine | 42.8 hrs | 11.4 hrs |
| Sump pump | 2.1 hrs | ❌ |