EcoFlow RIVER 2 Max
512 Wh · 500 W output · LiFePO4 · $299
✅ Specs verified against the manufacturer's official listing — source · Last checked
Our verdict
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.
What we like
- 512Wh with 500W output
- 60-minute recharge
- LiFePO4 at a mid-entry price
Where it falls short
- Still not enough output for heaters or compressors
- 220W solar input is modest
Full specifications
| Capacity | 512 Wh |
|---|---|
| Continuous output | 500 W |
| Surge output | 1000 W |
| Battery chemistry | LiFePO4 |
| Rated cycles | 3,000 |
| Weight | 13.2 lb |
| Max solar input | 220 W |
| Recharge (AC) | 1h |
| Expandable | No |
| Warranty | 5 years |
What can the EcoFlow RIVER 2 Max run?
| Appliance | Can start it? | Est. runtime |
|---|---|---|
| Refrigerator | ✅ Yes | 7.3 hrs |
| Mini fridge | ✅ Yes | 13.8 hrs |
| Chest freezer | ✅ Yes | 5.4 hrs |
| CPAP machine | ✅ Yes | 10.9 hrs |
| Sump pump | ❌ Surge too high | — |
| Well pump (1/2 HP) | ❌ Surge too high | — |
| Space heater | ❌ Surge too high | — |
| Window AC (8k BTU) | ❌ Surge too high | — |
| Microwave | ❌ Surge too high | — |
| Coffee maker | ❌ Surge too high | — |
| TV (55" LED) | ✅ Yes | 4.4 hrs |
| Laptop | ✅ Yes | 6.7 hrs |
| Phone charger | ✅ Yes | 21.8 hrs |
| CPAP + humidifier | ✅ Yes | 4.8 hrs |
| Fridge plus essentials | ✅ Yes | 4.4 hrs |
| 12V RV fridge | ✅ Yes | 24.2 hrs |
| Starlink | ✅ Yes | 7.3 hrs |
| Electric blanket | ✅ Yes | 14.5 hrs |
Runtime = (capacity × 0.85 inverter efficiency) ÷ appliance watts. Refrigerator assumes a 40% compressor duty cycle. Real-world results vary.