EcoFlow DELTA 3 Ultra vs Bluetti AC500
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
EcoFlow DELTA 3 Ultra costs $200 less. Whether that gap is worth closing depends on what you need to run.
- Bluetti AC500 has 2800W more surge headroom (10000W vs 7200W) — that decides whether a fridge, pump or AC compressor will actually start.
- Bluetti AC500 is 17.7 lb lighter (66.1 lb vs 83.8 lb).
- EcoFlow DELTA 3 Ultra is rated for 4,000 cycles vs 3,500 — meaningful if you cycle it daily.
EcoFlow DELTA 3 Ultra
3kWh with 7200W surge at $1799 — this is whole-home territory at a mid-range price. The catch is the 800W solar input.
Best for: Grid-tied home backup where you recharge from the wall, not the sun.
Where it falls short:
- 800W solar input is low for 3kWh — slow off-grid refills
- 83.8 lb
Bluetti AC500
A modular home-backup system, not a portable unit — the AC500 has no internal battery at all until you add B300K packs.
Best for: Serious home-backup builds where you're designing a system, not buying an appliance.
Where it falls short:
- Requires separate battery packs to function at all — budget accordingly
- Total system cost climbs fast
| Spec | EcoFlow DELTA 3 Ultra | Bluetti AC500 |
|---|---|---|
| Price | $1799 | $1999 |
| Capacity | 3072 Wh | 3072 Wh |
| Continuous output | 3600 W | 5000 W |
| Surge output | 7200 W | 10000 W |
| Battery | LiFePO4 | LiFePO4 |
| Rated cycles | 4,000 | 3,500 |
| Weight (lighter wins) | 83.8 lb | 66.1 lb |
| Max solar | 800 W | 3000 W |
| Recharge time (faster wins) | 1h 30m | 1h 45m |
Runtime head-to-head
| Appliance | EcoFlow DELTA 3 Ultra | Bluetti AC500 |
|---|---|---|
| Refrigerator | 43.5 hrs | 43.5 hrs |
| Mini fridge | 82.9 hrs | 82.9 hrs |
| Chest freezer | 32.6 hrs | 32.6 hrs |
| CPAP machine | 65.3 hrs | 65.3 hrs |
| Sump pump | 3.3 hrs | 3.3 hrs |