At a glance
Full specs ↓- Capacity
- 512 Wh
- Usable energy
- 461 Wh
- AC output
- 500 W
- Surge
- 1000 W
- Chemistry
- LiFePO4
- Cycle life
- 3000 cycles
- Max solar
- 220 W
- Weight
- 13.4 lb
Best for
CPAP overnight
Camping & vanlife
Mini fridge
Estimated usable capacity
Estimate
392 Wh
at the outlet · ~77% of the 512 Wh rating
An estimate, not a measurement: we derate the 512 Wh rating for a safe depth-of-discharge and ~15% inverter loss (DC→AC). We haven't bench-tested this unit yet, so treat it as a solid approximation.
EcoFlow
EcoFlow River 2 Max
★ 4.6 / 5
The EcoFlow River 2 Max is a 512Wh LiFePO4 portable power station delivering 500W continuous (1000W surge). Rated for ~3000 cycles and up to 220W of solar input.
$309
$0.67/Wh
Check current price →
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Where to buy
1 retailer
Prices refresh daily and may change — confirm on the retailer's site.
Full specifications
| Battery capacity | 512 Wh |
| Usable capacity | 461 Wh |
| AC output | 500 W |
| Surge output | 1000 W |
| Chemistry | LiFePO4 |
| Cycle life | 3000 cycles |
| Max solar input | 220 W |
| Expandable | No |
| Weight | 13.4 lb |
| Warranty | 5 yrs |
| Ports | 4x AC | 1x USB-C | 3x USB-A | 1x car |
Video review
We recommend watching a real-world test before buying. Here's a hands-on review of the River 2 Max:
Channels we trust for hands-on testing
Independent reviewers who bench-test capacity, inverters and real-world runtime.
Hobotech
Rigorous real-world capacity & inverter testing.
DIY Solar Power with Will Prowse
The go-to for DIY off-grid and teardown reviews.
The Solar Lab
Real world testing of solar panels and power stations.
How long will the River 2 Max run…
Estimated runtime per full charge for common loads.
Phone charge (about 1.6 days (~39 hours))
Laptop (about 7 hours)
Wi-Fi router / modem (about 1.1 days (~26 hours))
LED lights (per bulb) (about 1.6 days (~39 hours))
CPAP machine (about 10 hours)
Mini fridge (about 7 hours)
Full-size fridge (about 2.6 hours)
12V cooler / fridge (about 9 hours)
Microwave (1000W) (under an hour)
Coffee maker (under an hour)
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