Bluetti AC500 vs EcoFlow RIVER 2 Max
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 RIVER 2 Max costs $1700 less. Whether that gap is worth closing depends on what you need to run.
- Bluetti AC500 holds 500% more energy (3072Wh vs 512Wh), so it runs the same load proportionally longer.
- Bluetti AC500 has 9000W more surge headroom (10000W vs 1000W) — that decides whether a fridge, pump or AC compressor will actually start.
- EcoFlow RIVER 2 Max is 52.9 lb lighter (13.2 lb vs 66.1 lb).
- Bluetti AC500 is rated for 3,500 cycles vs 3,000 — meaningful if you cycle it daily.
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
Double the River 2's capacity and output for $100 more. The sweet spot of EcoFlow's small line for anyone eyeing the occasional small appliance.
Best for: Campers who want headroom over a pure device charger without the size of a 1kWh unit.
Where it falls short:
- Still not enough output for heaters or compressors
- 220W solar input is modest
| Spec | Bluetti AC500 | EcoFlow RIVER 2 Max |
|---|---|---|
| Price | $1999 | $299 |
| Capacity | 3072 Wh | 512 Wh |
| Continuous output | 5000 W | 500 W |
| Surge output | 10000 W | 1000 W |
| Battery | LiFePO4 | LiFePO4 |
| Rated cycles | 3,500 | 3,000 |
| Weight (lighter wins) | 66.1 lb | 13.2 lb |
| Max solar | 3000 W | 220 W |
| Recharge time (faster wins) | 1h 45m | 1h |
Runtime head-to-head
| Appliance | Bluetti AC500 | EcoFlow RIVER 2 Max |
|---|---|---|
| Refrigerator | 43.5 hrs | 7.3 hrs |
| Mini fridge | 82.9 hrs | 13.8 hrs |
| Chest freezer | 32.6 hrs | 5.4 hrs |
| CPAP machine | 65.3 hrs | 10.9 hrs |
| Sump pump | 3.3 hrs | ❌ |