EcoFlow RIVER 2 Max: what it runs and for how long
The EcoFlow RIVER 2 Max is a 512 Wh LiFePO4 portable power station with a 500 W inverter (1,000 W surge). Compared with the EcoFlow RIVER 2 Pro, it has 512 Wh of capacity instead of 768 Wh and 500 W of AC output instead of 800 W. It is the lightest of the 6 500–999 Wh models we track (13.4 lb), and the most capacity per dollar in the 500–999 Wh class (1.71 Wh per list dollar). It meets our requirements for camping, carrying a CPAP on trips (light enough to pack) and UPS use with computers and routers, plus 1 more use.
What can the EcoFlow RIVER 2 Max run, and for how long?
Combine loads in the EcoFlow RIVER 2 Max runtime calculatorOn a full charge it runs a 12V compressor fridge for about 41 h and a CPAP machine for about 7.8 h.
What can’t the EcoFlow RIVER 2 Max run?
The EcoFlow RIVER 2 Max can't run a refrigerator or a chest freezer (start-up ~2,200 W, limit 1,000 W); a microwave or a well pump (needs 1,000 W, inverter is 500 W); a space heater or an electric kettle (needs 1,500 W, inverter is 500 W).
Who is the EcoFlow RIVER 2 Max a good fit for?
The EcoFlow RIVER 2 Max meets every requirement for 4 of the 12 uses we filter for.
- ✓Camping
- ✓Carrying a CPAP on trips (light enough to pack)
- ✓UPS use with computers and routers
- ✓A LiFePO4 station under $500
- ✕Fast solar charging · needs solar input ≥ 800 W; the EcoFlow RIVER 2 Max has 220 W
- ✕Balcony solar and apartments · needs solar input ≥ 400 W; the EcoFlow RIVER 2 Max has 220 W
Can the EcoFlow RIVER 2 Max work as a UPS?
EcoFlow lists a switchover time of 30 ms for the EcoFlow RIVER 2 Max, outside the 20 ms gap that the ITI (CBEMA) reference says typical computer equipment should ride through.
How fast does the EcoFlow RIVER 2 Max recharge?
From a wall outlet it recharges in about 60 minutes in its fastest mode, per EcoFlow. From solar it needs about 3.1 hours of strong sun at its 220 W solar limit, with panels delivering 75% of their rating.
What are the EcoFlow RIVER 2 Max's full specifications?
These figures come from EcoFlow's official US page, checked 2026-10-12. "Not published" marks specs EcoFlow doesn't publish.
| Capacity | 512 Wh |
|---|---|
| Battery chemistry | LiFePO4 |
| Rated cycles | 3,000 Cycle life is rated to 80% capacity or more. |
| AC output (continuous) | 500 W |
| AC surge | 1,000 W |
| AC outlets | Not published EcoFlow does not state the AC outlet count. |
| Max USB-C output | 100 W |
| Max solar input | 220 W |
| Max AC charging input | 660 W |
| AC charge time (fastest mode) | 60 min |
| Expandable | Not published |
| Max with extra batteries | Not published |
| UPS switchover | 30 ms Under 30 ms EPS auto-switch, not described as true UPS. |
| Weight | 13.4 lb |
| Dimensions | 10.6 × 10.2 × 7.7 in |
| List price | $299 |
How does the EcoFlow RIVER 2 Max rank against other 500–999 Wh power stations?
Among the 6 current 500–999 Wh models, the EcoFlow RIVER 2 Max is in the top third for weight and Wh per list dollar and in the bottom third for capacity, AC output and rated cycles.
| Spec | EcoFlow RIVER 2 Max | Rank in band | vs band median | vs band leader |
|---|---|---|---|---|
| Capacity | 512 Wh | 5th of 6 | -29% | -49% vs Goal Zero Yeti 1000 |
| AC output | 500 W | 6th of 6 | -44% | -75% vs Goal Zero Yeti 1000 |
| Surge | 1,000 W | 3rd of 4 | -23% | -72% vs Goal Zero Yeti 1000 |
| Solar input | 220 W | 3rd of 5 | level | -76% vs Goal Zero Yeti 1000 |
| AC charging | 660 W | 4th of 6 | -18% | -53% vs BLUETTI Pioneer Na |
| Rated cycles | 3,000 | 5th of 6 | -25% | -25% vs DJI Power 500 |
| Weight | 13.4 lb | 1st of 6 | -30% | leads the band |
| UPS switchover | 30 ms | 4th of 5 | +50% | +100% vs Goal Zero Yeti 1000 |
| Wh per list $ | 1.71 | 1st of 6 | +69% | leads the band |
Who should not buy the EcoFlow RIVER 2 Max?
Skip the EcoFlow RIVER 2 Max if any of these describe you; each comes from its published specs.
- You want to keep a desktop running through outages. Its 30 ms switchover is slower than the 20 ms many computer power supplies are designed to ride through. The DJI Power 500 is rated at 20 ms.
- You may want more battery later. The EcoFlow RIVER 2 Max isn't listed as expandable. The EcoFlow RIVER 3 Plus (286 Wh) accepts extra batteries.
- You want to run a kettle, microwave or space heater. Its 500 W inverter is below the 1,000 W or more our cited figures give for each of them. The BLUETTI Pioneer Na delivers 1,500 W.
How long does the EcoFlow RIVER 2 Max last at different loads?
About 435 Wh reaches the AC outlets, so a steady 100 W load runs for about 4.4 h and a load at its full 500 W rating for about 52 minutes.
| Steady AC load | Runtime from full |
|---|---|
| 25 W | 17 h |
| 50 W | 8.7 h |
| 100 W | 4.4 h |
| 200 W | 2.2 h |
| 300 W | 1.5 h |
| 500 W | 52 min |
What does the EcoFlow RIVER 2 Max cost per kWh over its rated life?
About $0.19 per kWh of storage at list price, if you use all 3,000 rated cycles. The median for 500–999 Wh models is $0.25 per kWh, so the EcoFlow RIVER 2 Max is cheaper over its rated life.
Rated life energy = 512 Wh × 3,000 cycles ≈ 1,536 kWh. List price $299 ÷ 1,536 kWh ≈ $0.19.
How many hours of sun does the EcoFlow RIVER 2 Max need to refill?
With panels delivering 75% of their rating (our calculator's default), the EcoFlow RIVER 2 Max needs the hours of strong sun below. Its 220 W solar limit caps the charge rate, so panels beyond about 293 W add nothing in strong sun.
| Panels | Charge rate | Sun hours to refill |
|---|---|---|
| 100 W of panels | 75 W | 6.8 h |
| 200 W of panels | 150 W | 3.4 h |
| 400 W of panels | 220 W | 2.3 h |
| 800 W of panels | 220 W | 2.3 h |
What can the EcoFlow RIVER 2 Max run at the same time?
The EcoFlow RIVER 2 Max can carry 2 of the 10 common pairs we check at once, with the runtimes below. It can't carry refrigerator + wi-Fi router / modem, refrigerator + chest freezer, refrigerator + microwave oven, refrigerator + electric kettle, window air conditioner + refrigerator, sump pump + refrigerator, space heater + wi-Fi router / modem and microwave oven + electric kettle: together they pass its running or start-up limit.
| Together | Runtime from full |
|---|---|
| CPAP with heated humidifier + wi-Fi router / modem | 5.7 h |
| TV + wi-Fi router / modem | 3.1 h |
Which EcoFlow RIVER 2 Max specs are unpublished or conditional?
EcoFlow publishes every spec we track for the EcoFlow RIVER 2 Max.
3 published figures come with conditions, shown under the spec table: AC outlets, UPS switchover and rated cycles.
How does the EcoFlow RIVER 2 Max compare with similar power stations?
By capacity, the nearest models from other brands are DJI Power 500 and Goal Zero Yeti 500.
How is the EcoFlow RIVER 2 Max different from the EcoFlow RIVER 2 Pro?
The EcoFlow RIVER 2 Pro is the closest EcoFlow model. Pick the EcoFlow RIVER 2 Max if you want a lower list price and less weight; otherwise the EcoFlow RIVER 2 Pro gives you the opposite trade-off.
| EcoFlow RIVER 2 Max | EcoFlow RIVER 2 Pro | |
|---|---|---|
| Capacity | 512 Wh | 768 Wh |
| AC output | 500 W | 800 W |
| Surge | 1,000 W | 1,600 W |
| Weight | 13.4 lb | 18.2 lb |
| List price | $299 | $529 |
Which models from other brands are closest in size?
Which other EcoFlow models are similar?
How this page was made. Specs come from each manufacturer's official US spec page or manual, checked on the date shown; specs a manufacturer doesn't publish are marked "Not published". Runtimes are calculated (capacity × 85% inverter efficiency ÷ appliance draw), not measured. We haven't hands-on tested these units. Method and sources · Affiliate disclosure