EcoFlow RIVER 3 Plus: Runtime & Specs

By Hicham M. · Specs from EcoFlow's published documents, as of September 2026 · How we calculate

The EcoFlow RIVER 3 Plus is a 286 Wh LiFePO4 power station with 600 W of continuous AC output and a 1,200 W surge rating. It runs a typical full-size fridge for about 4.2 hours.

Capacity286 WhLiFePO4

Output600 W1,200 W surge

Solar input220 W

Weight10.4 lbexpands to 858 Wh

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Simulated runtimes (not measured)

Nobody tested this unit for this page. These figures come from a computer simulation of the RIVER 3 Plus, and they are estimates. The plain runtime table below divides energy by average draw at 85% efficiency. The simulation also charges the battery for the power the inverter burns just by being switched on, which is why small loads come out shorter. Where we have measured a unit, the measurement is shown separately and labeled as measured.

Simulated runtimes for the EcoFlow RIVER 3 Plus
Device	Spec-sheet math	Simulated, typical	Likely range	Simulated at 0 °C
Wi-Fi router + modem	16 hours	9.8 hours	8.5 hours to 11 hours	8.3 hours
CPAP (no humidifier)	8.1 hours	6.2 hours	5.7 hours to 6.8 hours	5.2 hours
Starlink Standard	2.7 hours	2.5 hours	2.4 hours to 2.6 hours	2.2 hours
Refrigerator (full-size, ENERGY STAR)	4.2 hours	3.7 hours	3.4 hours to 4 hours	3.2 hours

Nonstop runtime from full to battery cutoff. Likely range = middle 80% of 200 simulated runs with the uncertain inputs varied. The inverter idle draw is assumed, not published: we assumed about 12 W for this model, varied from 7 to 17 W. If the real figure is lower, real runtimes land closer to the spec-sheet column.

How this was simulated

The battery is stepped down every 2 minutes until it reaches cutoff, for 200 runs per device. Results are seeded, so the page shows the same numbers on every build.
Battery draw = load + inverter idle draw + 4–8% of the load + a loss that rises with load squared (4% at full output).
Usable capacity = 92–98% of rated Wh, for protection cutoff and aging.
At 0 °C, 80–90% of that capacity is assumed available.
Fridges cycle on and off every 30–50 minutes at the share of the time set by their average draw. The inverter idle draw continues while the compressor is off.
Devices that exceed this model's output or surge rating are left out. Loads are US 120 V devices.

These ranges are assumptions about a typical unit. They are not manufacturer figures for the EcoFlow RIVER 3 Plus. How we calculate · How we use AI

How long will the RIVER 3 Plus run your appliances?

Nonstop runtime for one device at a time, using typical US wattages and 85% inverter efficiency. Devices marked ✕ can't run on this model.

Estimated runtime by appliance for the EcoFlow RIVER 3 Plus
Device	Avg draw	Runtime
LED light bulb	9 W	27 hours
Phone charging	10 W	26 hours
Wi-Fi router + modem	15 W	16 hours
Laptop	50 W	4.9 hours
CPAP (no humidifier)	30 W	8.1 hours
CPAP with heated humidifier	60 W	4.1 hours
Starlink Standard	90 W	2.7 hours
TV	100 W	2.4 hours
Mini fridge	29 W	8.4 hours
Refrigerator	58 W	4.2 hours
Chest freezer	29 W	8.4 hours
Sump pump (1/3 HP)	160 W	Not enough output
Sump pump (1/2 HP)	210 W	Not enough output
Window AC	225 W	1.1 hours
Drip coffee maker	1,000 W	Not enough output
Microwave	1,500 W	Not enough output
Space heater	750 W	Not enough output
Well pump	33 W	Needs 240 V

Fridges, freezers, pumps and AC units cycle on and off, so we use their average draw. Want a mix of devices on a schedule? Use the runtime calculator.

What the RIVER 3 Plus can't power

Refrigerator (older full-size, 1990s–early 2000s): needs about 1,600 W to start
Microwave (1,000 W cooking power): needs 1,500 W running
Drip coffee maker (10–12 cup): needs 1,000 W running
Electric kettle (1.7 L): needs 1,500 W running
Toaster (2–4 slice): needs 1,000 W running
Induction burner (single, portable): needs 1,500 W running
Electric pressure cooker (6 qt, Instant Pot type): needs 1,000 W running
Window AC (8,000 BTU): needs 700 W running
Space heater (portable, 1,500 W): needs 1,500 W running
Gas furnace blower fan: needs about 1,400 W to start
Sump pump (1/3 HP): needs 800 W running
Sump pump (1/2 HP): needs 1,050 W running
Well pump (1/2 HP submersible): needs 240 V
Garage door opener: needs 720 W running
Circular saw (7-1/4 in.): needs 1,400 W running
EV Level 1 charging (120 V, 12 A): needs 1,440 W running

Solar charging time

Hours of good sun to charge from empty, assuming panels deliver 75% of their rating.

Panels	Power in	Hours of sun
100 W of panels	75 W	3.8 hours
200 W of panels	150 W	1.9 hours
220 W of panels	165 W	1.7 hours

Check panel voltage and wiring with the solar charging calculator.

Full specifications

Battery capacity	286 Wh
Amp-hours at 12 V (converted) How we convert	23.8 Ah (22.3 Ah at 12.8 V)
Battery chemistry LFP vs NMC	LiFePO4 (LFP)
Continuous AC output	600 W
Surge (peak) output	1,200 W
X-Boost (heating devices)	1,200 W
AC voltage	120V
AC outlets	3
USB-C ports	1 (up to 100 W)
USB-A ports	2
12 V car outlet	Yes
Max solar input	220 W
Solar voltage range	—
Solar max current	—
Max AC charging power	380 W
AC charging time (maker claim)	0–100% in 60 min
Expandable	Yes, up to 858 Wh
UPS / EPS switchover What this means	10 ms
Cycle life What this means	3,000 cycles (to 80%)
Weight	10.4 lb
Warranty	5 years

Notes: Expands to 858Wh with RIVER 3 Plus Smart Extra Battery EB300 (286Wh) or EB600 (572Wh). Car outlet per REI listing. Solar V/A not on EcoFlow US page. Warranty 5 years per the US warranty policy table.

Specs from EcoFlow's published documents, as of September 2026. Found an error? Tell us.

Sources

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Questions

How long will the EcoFlow RIVER 3 Plus run a refrigerator?

About 4.2 hours for a typical ENERGY STAR full-size fridge averaging 58 W, assuming 85% inverter efficiency. Older or larger fridges use more. Try your own numbers.

Can the EcoFlow RIVER 3 Plus run a microwave?

Not a full-size one. A typical 1,000 W microwave pulls about 1,500 W from the outlet, more than its 600 W continuous output. Its X-Boost mode is meant for simple heating devices, and microwaves may not work properly with it.

How many amp-hours is the EcoFlow RIVER 3 Plus?

The EcoFlow RIVER 3 Plus works out to about 23.8 Ah at 12 V, or 22.3 Ah at 12.8 V, the nominal voltage of a 12 V LiFePO4 battery. Both are our conversion of EcoFlow's 286 Wh rating: amp-hours = watt-hours ÷ volts. The battery inside may run at a different voltage, so an amp-hour figure in a manual or on a product listing can look very different for the same energy. For scale, a 12 V 100 Ah LiFePO4 battery holds 1,280 Wh, so this model holds about 22% as much as one. How we convert amp-hours.

How long does the EcoFlow RIVER 3 Plus take to charge?

EcoFlow's published charging claim: “0–100% in 60 min”. Max AC charging power is 380 W. With solar, it accepts up to 220 W. With 220 W of panels that's roughly 1.7 hours of good sun from empty.

Is the EcoFlow RIVER 3 Plus expandable?

Yes, up to 858 Wh with EcoFlow's extra batteries.

Does the EcoFlow RIVER 3 Plus work as a UPS?

EcoFlow lists a 10 ms switchover time, so it can keep devices like routers and computers running when the power drops. Check that your specific device tolerates the switch before relying on it for anything critical.