Specifications checked against manufacturer pages on 2026-08-24.
EcoFlow RIVER 2 Pro: 768 Wh of LiFePO4 (LFP) cells behind an 800 W continuous inverter, in the 1 kWh-class size. Checked against the maker’s page on 2026-08-24: every published figure, the runtimes those figures imply, and the specifications EcoFlow does not publish at all. Nothing here is a bench result, and each calculated number says so on its own row.
In short. 768 Wh in the 1 kWh-class band: $0.69/Wh at the list price we recorded; 42.2 Wh per pound; 3,000 rated cycles to 80%+. On our assumptions a full-size refrigerator calculates to 12–13 hr (start-up not assessed), and a 40 W CPAP calculates to 15–17 hr. EcoFlow leaves 2 of the rows we track unstated, and we name them rather than filling in a guess. The 1,600 W the maker publishes is a boost mode rather than a motor-start surge, and we treat the two differently. The runtime figures are calculated, not measured.
Check the current price
That link points at the base unit we transcribed, not a kit with panels. Amazon prices change daily.
Who it is for, and who should skip it
The published figures answer this before any opinion does.
It fits if
- A refrigerator through a short outage. It carries a typical full-size unit through most of a working day on our assumptions, but not a whole one.
- One night of uninterrupted medical equipment. A 40 W machine without a humidifier runs the night with margin, and the maker states under 30 ms on the grid handover. A heated humidifier changes that arithmetic.
- The unit has to move. 18.2 lb is a two-hands lift rather than a cart job, so car to porch to basement is realistic.
Skip it if
- You want resistive heat. A 1,500 W heater is above the 800 W continuous rating; it will not run.
- A hard-starting motor is the point. EcoFlow publishes no motor-start surge rating here, so published figures cannot confirm it spins up a pump or a compressor with an unusual inrush.
- You own a large array already. It takes at most 220 W of solar; panels past that ceiling idle rather than charge it faster.
Every published specification
Numbered notes give the source location or a caveat where a figure needs one. “Manufacturer does not state” marks an absence on the maker’s page; “Not yet verified by CalmWatt” marks one of ours.
| Specification | EcoFlow RIVER 2 Pro |
|---|---|
| Rated capacity | 768 Wh1 |
| Usable capacity (calculated)* | 653–691 Wh |
| Continuous AC output | 800 W2 |
| Surge output | No conventional surge stated (1,600 W boost mode)3 |
| Full recharge from wall | 70 min4 |
| Cell chemistry | LiFePO4 (LFP)5 |
| Rated cycle life | 3,000 cycles to 80%+6,7 |
| UPS switchover | <30 ms8 |
| Expandable | Manufacturer does not state |
| Max solar input | 220 W9 |
| Max AC charging input | 940 W10 |
| AC outlets | Manufacturer does not state |
| Highest USB-C port | 100 W11 |
| App control | Yes12 |
| Stated noise | 62 dB13 |
| Warranty | 5 years14 |
| Weight | 18.2 lb15 |
| Manufacturer list price when checked | $52916 |
* Rated capacity × an assumed 85–90% conversion efficiency. Ours, because nobody publishes one.
Notes on the figures
- RIVER 2 Pro, rated capacity: Rated capacity as stated by the manufacturer; the spec sheet lists Capacity as 768Wh.
- RIVER 2 Pro, continuous output: Total continuous AC output across all outlets combined.
- RIVER 2 Pro, surge: The stated surge figure equals the X-Boost figure the page markets for running high-wattage resistive appliances such as hair dryers, microwaves, and electric kettles. It is not a conventional motor-start surge rating and should not be read as one.
- RIVER 2 Pro, full recharge: Full 0-100% recharge from a wall outlet.
- RIVER 2 Pro, cell chemistry: The spec sheet lists the cell chemistry as LFP.
- RIVER 2 Pro, cycle life: The manufacturer states this equals roughly 10 years of everyday use.
- RIVER 2 Pro, cycle life: The battery is rated to retain at least 80 percent of its original capacity after 3,000 charge cycles.
- RIVER 2 Pro, UPS switchover: Upper bound. The manufacturer markets this as an EPS auto-switch for essential devices during outages rather than a full UPS.
- RIVER 2 Pro, solar input: Maximum solar input, with an accepted voltage range of 11-50 V at up to 13 A.
- RIVER 2 Pro, AC input: Maximum AC wall-charging input power.
- RIVER 2 Pro, USB-C: The USB-C port is a shared input/output port rated at 100 W maximum in either direction.
- RIVER 2 Pro, app: Controlled through the EcoFlow app over Wi-Fi or Bluetooth.
- RIVER 2 Pro, noise: Upper bound, occurring when charging and discharging at high wattage.
- RIVER 2 Pro, warranty: Stated on the product page as one of the most extended warranties in the industry.
- RIVER 2 Pro, weight: The spec sheet lists net weight as approximately 18.2 lb.
- RIVER 2 Pro, price: List price; a sale price of $349.00 was shown at the time of capture.
What EcoFlow does not state
What a maker leaves out is a fact about the product too. Every gap on this unit’s page, named rather than quietly filled in. Of the 34 units we have transcribed, 29 omit at least one figure; this one omits 2 figures.
- Expandable combo. Absent from EcoFlow’s specifications for this unit when we checked.
- The number of ac outlets. Absent from EcoFlow’s specifications for this unit when we checked.
- A motor-start surge rating. The 1,600 W figure EcoFlow publishes is a boost mode for resistive loads, so it does not answer whether a compressor starts. We do not treat it as if it did.
- Usable capacity. Nobody states this, here or elsewhere. The rating describes the cells, not the outlet, and the difference depends on what you plug in.
Omissions are the industry norm rather than this maker’s failing. The point is that a confident figure for any of them, anywhere, came from somebody’s guess.
What it runs, and for how long
The appliance set is fixed across the site, which is what makes these hours comparable with any other page here.
| Appliance | RIVER 2 Pro |
|---|---|
| Full-size refrigerator 150 W, 900 W start, 35% duty · eff. 80%–87% |
12–13 hr (start-up not assessed) |
| Mini fridge 70 W, 400 W start, 30% duty · eff. 80%–87% |
29–32 hr |
| CPAP without humidifier 40 W · eff. 80%–87% |
15–17 hr |
| CPAP with heated humidifier 95 W · eff. 80%–87% |
6.5–7.0 hr |
| Gas furnace blower 400 W, 1600 W start, 40% duty · eff. 85%–90% |
4.1–4.3 hr (start-up not assessed) |
| 1/3 hp sump pump 500 W, 1800 W start, 15% duty · eff. 85%–90% |
8.7–9.2 hr (start-up not assessed) |
| Router and modem 20 W · eff. 70%–82% |
27–31 hr |
| Laptop 60 W · eff. 80%–87% |
10–11 hr |
| 1500W space heater 1500 W |
Will not run |
Calculated, not measured: hours = rated Wh × efficiency ÷ (appliance W × duty). Assumptions: How we verify. “Unlikely to start” means the start-up surge exceeds the stated surge rating. Where a row says start-up was not assessed, the maker states no surge rating and the draw is at or above the continuous figure; those hours assume the motor turns.
The same specs, normalized
| Measure | RIVER 2 Pro |
|---|---|
| Cost per watt-hour | $0.69/Wh |
| Watt-hours per pound | 42.2 Wh/lb |
| Surge headroom | Not applicable — the stated figure is a boost-mode rating, not a motor-start surge. |
| Recharge rate | 11.0 Wh/min |
| Rated cycle life | 3,000 cycles to 80%+ |
| Continuous watts per dollar | 1.51 W/$ |
A ratio means something only against another unit’s, so pair these with the head-to-head pages below. Definitions: How we verify.
What those figures actually mean
Cost per watt-hour: $0.69/Wh. The $529 list price we recorded over 768 Wh of rated capacity. Capacity alone tells you nothing about value. This does, and it moves every time the price does.
Watt-hours per pound: 42.2 Wh/lb. 768 Wh in 18.2 lb makes this a two-hands lift. These cells are heavier per watt-hour than the ones they replaced, and last far longer. That is the trade the cycle rating prices.
Surge headroom: not applicable. Dividing a resistive-load boost figure by the continuous rating produces a number that reads as motor-start margin and is not one. The row stays blank.
Recharge rate: 11.0 Wh/min. A full wall charge in 70 minutes. Over a long outage, refill speed decides how long an engine runs or a cord stays borrowed.
Rated cycle life: 3,000 cycles to 80%+ capacity. At one cycle a week that is roughly 58 years away, which is another way of saying something else will retire this unit first unless you cycle it daily. The percentage matters as much as the count: two ratings only compare when they name the same remaining capacity.
Continuous watts per dollar: 1.51 W/$. This one moves opposite to cost per watt-hour on most units, so a unit can look good on exactly one of them.
Where it sits in our database
Read against our own database rather than against the maker’s marketing, the figures place like this.
| Measure | RIVER 2 Pro | Among verified units |
|---|---|---|
| Rated capacity | 768 Wh | 28th largest of 34 |
| Continuous AC output | 800 W | 28th highest of 34 |
| Cost per watt-hour | $0.69/Wh | 19th cheapest of 32 |
| Watt-hours per pound | 42.2 Wh/lb | 8th densest of 34 |
| Weight | 18.2 lb | 7th lightest of 34 |
These positions describe size and price, not fitness for your outage. The row built on price uses the manufacturer list price recorded on 2026-08-24; the retail price behind our link moves independently, so recompute that row against what you are shown.
Three outages, and the figure that decides each
- One night, one CPAP. A 40 W CPAP without a humidifier calculates to 15–17 hr. The stated under 30 ms handover is what decides whether the machine notices the outage.
- Twelve hours, one refrigerator. The roughly 900 W start is at or above what published figures can confirm, so the 12–13 hr (start-up not assessed) below assumes the compressor does start.
- The loads people forget. A gas furnace blower calculates to 4.1–4.3 hr (start-up not assessed) and a one-third horsepower sump pump calculates to 8.7–9.2 hr (start-up not assessed). Both are hard-wired in most houses, which makes this an electrician’s question before it is a battery one. A router and modem, meanwhile, calculates to 27–31 hr.
- Three days, with something to recharge from. A full wall recharge takes 70 minutes, and it accepts up to 220 W of solar, so day two turns on your panels and your sky.
The RIVER 2 Pro against other units
A single unit’s ratios mean little alone. These 4 head-to-head pages put the RIVER 2 Pro against another unit on the same figures.
- Anker SOLIX C800 vs EcoFlow RIVER 2 Pro
- Bluetti AC180 vs EcoFlow RIVER 2 Pro
- Bluetti AC70 vs EcoFlow RIVER 2 Pro
- EcoFlow DELTA 3 vs EcoFlow RIVER 2 Pro
Questions people ask about the RIVER 2 Pro
Every answer below comes from the tables above.
How long will the RIVER 2 Pro run a refrigerator?
12–13 hr (start-up not assessed) on our assumptions for a typical full-size unit at 150 W running and a 35% duty cycle. Start-up is the check that comes before hours. Substitute the wattage from the label inside your door.
Can the RIVER 2 Pro run a CPAP all night?
Yes on capacity: a 40 W machine without a humidifier calculates to 15–17 hr against the eight hours a night usually needs. The maker states under 30 ms on the handover. Add a heated humidifier and the hours roughly halve.
How long does the RIVER 2 Pro take to recharge?
70 minutes from a wall outlet on the maker’s figure, with up to 220 W accepted from solar. That is the figure that matters once the outage passes a day.
How much does the RIVER 2 Pro weigh?
18.2 lb on the maker’s figure, or 42.2 Wh of rated capacity carried per pound. That is a two-hands lift, which is why units this size tend to stay where you put them.
How many cycles is the RIVER 2 Pro rated for?
3,000 cycles to 80%+ of original capacity, on LiFePO4 (LFP) cells, which is roughly 58 years at one cycle a week. A figure quoted to a different retention level is a different promise, not a better one.
Will the RIVER 2 Pro run a space heater?
No. A 1,500 W heater is above the 800 W continuous rating.
Check the current price
That link points at the base unit we transcribed, not a kit with panels. Amazon prices change daily.
Related reading
The honest comparison is not with a bigger battery but with an engine: its continuous rating does not cover a 1,500 W space heater at all, yet nothing here vents carbon monoxide into a garage. How often gasoline generators kill indoors — and how the official count keeps being revised — is documented in our CPSC revision matrix, while our refrigerator hub ranks every unit we have verified on the same twelve hours.
Ordering before a storm? Check the arrival date at checkout — a unit that ships tomorrow can beat a better one that ships next week. Amazon Prime includes fast delivery on eligible items and starts with a free trial; we earn a commission if you join.
Sources and method
- EcoFlow RIVER 2 Pro: manufacturer product page, checked 2026-08-24.
Every quoted number comes from the maker’s page with its source sentence recorded. Every calculated number is marked as such and uses the formula above. Method: How we verify. More: Comparisons.