EcoFlow DELTA 3 Ultra Plus 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
These two cost the same, so the decision comes down to what you're powering.
- 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 19.4 lb lighter (66.1 lb vs 85.5 lb).
- EcoFlow DELTA 3 Ultra Plus is rated for 4,000 cycles vs 3,500 — meaningful if you cycle it daily.
EcoFlow DELTA 3 Ultra Plus
The Ultra's solar problem solved: same everything, but 1600W of PV input instead of 800W. That doubles your off-grid refill speed for $200.
Best for: Off-grid cabins and van builds that actually recharge from panels.
Where it falls short:
- $1999 approaches DELTA Pro 3 pricing
- 85.5 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 Plus | Bluetti AC500 |
|---|---|---|
| Price | $1999 | $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) | 85.5 lb | 66.1 lb |
| Max solar | 1600 W | 3000 W |
| Recharge time (faster wins) | 1h 30m | 1h 45m |
Runtime head-to-head
| Appliance | EcoFlow DELTA 3 Ultra Plus | 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 |