Buying Decision · Updated October 20, 2026

EcoFlow River 3 vs River 3 Plus vs River 3 Max Plus

For most people, the River 3 Plus. It doubles the River 3’s output and solar input, switches over faster as a desk UPS, and can take an extra battery later. The River 3 Max Plus is not a different station — it is a River 3 Plus bundled with a 572 Wh extra battery for 858 Wh total, which is the one to buy if you need a CPAP for about two nights. The base River 3 is the smallest and lightest, for phones, laptops and lights. One thing to know before you compare listings: the big wattage figure on River boxes is X-Boost, not continuous output.

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By Jordan Park Reviewed & approved by Juhi Sahni | Updated: October 20, 2026

River 3 Models Side by Side

Spec	River 3	River 3 Plus	River 3 Max Plus
Capacity	245 Wh	286 Wh	858 Wh
Continuous AC output	300W	600W	600W
X-Boost (resistive loads only)	600W	1,200W	1,200W
Max solar input	110W	220W	220W
UPS switchover (advertised)	under 20 ms	under 10 ms	under 10 ms
Expandable	No	Yes, to 858 Wh	Already at 858 Wh
Weight	7.8 lb	10.4 lb	23.2 lb (combined, approx.)
Our rating	84/100	86/100	86/100
Price now	$249.00	Check price at Amazon →	Check price at Amazon →

Specs checked against EcoFlow's published figures plus independent retailer and review data. EcoFlow also sells a River 3 Max (River 3 Plus plus a smaller extra battery, 572 Wh total), which we do not track separately. The Max Plus weight is the sum of the two components' listed weights.

X-Boost Is Not Continuous Output

River boxes and listings lead with the X-Boost figure — 600W on the River 3, 1,200W on the River 3 Plus. X-Boost lets a heating appliance such as a kettle, hair dryer or small heater run on the station by lowering the voltage it receives, so it runs slower or cooler rather than tripping the inverter. It does not let the station start or run a motor, compressor or electronics above its continuous rating.

So plan on 300W (River 3) or 600W (River 3 Plus and Max Plus) of real output. That covers a CPAP, a laptop, a mini fridge, lights and a router — and rules out a full-size microwave, coffee maker or blender at full power. If those matter, step up to a 1 kWh class station; see the best 1000 watt solar generators.

How Long Each River Runs Common Loads

Continuous-draw estimates with about 15% lost to conversion. A CPAP's draw depends heavily on whether the heated humidifier is on.

Load	River 3	River 3 Plus	River 3 Max Plus
Router and modem (~15W)	~13.9 hrs	~16.2 hrs	~48.6 hrs
CPAP without humidifier (~40W)	~5.2 hrs	~6.1 hrs	~18.2 hrs
Laptop (~60W)	~3.5 hrs	~4.1 hrs	~12.2 hrs
Mini fridge (average while cycling) (~50W)	~4.2 hrs	~4.9 hrs	~14.6 hrs
Desk setup: monitor, PC, router (~150W)	~1.4 hrs	~1.6 hrs	~4.9 hrs

For CPAP use without the humidifier, the Max Plus covers about two nights between charges; the River 3 and River 3 Plus cover about one night. See our CPAP runtime guide.

Using a River 3 Plus as a UPS

All three can sit between the wall and your equipment and take over when the power drops. The River 3 Plus advertises a switchover under 10 milliseconds, against under 20 ms for the River 3 — the faster figure is the one that keeps more desktop PCs and network storage from rebooting. Owners have reported that some sensitive loads still notice the switch, so test your own setup before relying on it. Our power station vs UPS guide explains when a dedicated UPS is still the better tool.

Which River Should You Buy?

River 3

You want the smallest, lightest unit for phones, laptops, lights and a router, and will never add capacity.

River 3 Plus

You want the best all-rounder: 600W, 220W solar, the fastest UPS switchover, and the option to add a battery later.

River 3 Max Plus

You need about two nights of CPAP or a long weekend off-grid, and want it in two carryable pieces.

The Three EcoFlow River 3 Models, With Live Prices

Ordered by how well each suits most buyers. Specs come from our product database and prices are live from Amazon.

Best River for most people

EcoFlow River 3 Plus

86/100

286 Wh 600W output 1,200W surge 220W solar in 10.4 lb

Twice the River 3’s output and solar input, a faster UPS switchover, and the option to add an extra battery later. The best-balanced of the three. Read our full River 3 Plus review →

See today’s price on Amazon

Check Price on Amazon →

Lowest we’ve logged: $246.05 (Oct 6) · our log since Sep 18

Best for a CPAP or long weekends

EcoFlow River 3 Max Plus

86/100

858 Wh 600W output 220W solar in 23.2 lb

The River 3 Plus bundled with the 572 Wh Extra Battery 600 for 858 Wh total. Three times the capacity of a River 3 Plus alone, and the two pieces separate so you only carry the battery when you need it.

See today’s price on Amazon

Check Price on Amazon →

Smallest and lightest

EcoFlow River 3

84/100

245 Wh 300W output 110W solar in 7.8 lb

Good for phones, laptops, lights and a router. Not expandable, with half the River 3 Plus’s output. EcoFlow’s US store has started steering shoppers to the River 3 Plus, so check availability.

$249.00Current price on Amazon

Check Price on Amazon →

At our lowest logged price — $249.00 · our log since Oct 19

Prices shown are the current Amazon price. Badges come from our own daily price log — see the solar generator price tracker; they describe what we observed on the listing, not a manufacturer claim or a prediction.

Related Guides

EcoFlow River 3 Plus Review

Our full review of the pick of the range

EcoFlow Brand Guide

River, Delta and Delta Pro compared

Best Solar Generators Under $500

The River 3 family against its rivals

All Solar Generator Reviews

Every model we rate, in one sortable chart

EcoFlow River 3 FAQ

What is the difference between the EcoFlow River 3 and River 3 Plus?

The River 3 Plus has 286 Wh against 245 Wh, twice the continuous output (600W vs 300W), twice the solar input (220W vs 110W), a faster advertised UPS switchover (under 10 ms vs under 20 ms), and it can take an extra battery. The River 3 is lighter at 7.8 lb against 10.4 lb.

What is the EcoFlow River 3 Max Plus?

It is a River 3 Plus bundled with EcoFlow's 572 Wh Extra Battery 600, for 858 Wh in total. Output and solar input are the same as the River 3 Plus; the extra battery triples the capacity, and the two pieces separate.

How many watts can the River 3 Plus really run?

600W continuous. The 1,200W figure is X-Boost, which lets heating appliances like a kettle or hair dryer run at reduced voltage. It does not let the station run motors, compressors or electronics above 600W.

Can the EcoFlow River 3 Plus work as a UPS?

Yes. EcoFlow advertises a switchover under 10 ms, fast enough for most routers and many desktop PCs. Some owners report that very sensitive equipment still notices the switch, so test it with your own setup.

Which EcoFlow River is best for a CPAP?

The River 3 Max Plus. At 858 Wh it runs a CPAP without the heated humidifier for about two nights. The River 3 and River 3 Plus manage about one night (5 to 6 hours) at a similar draw.

Can I add a battery to a River 3?

Not to the base River 3. The River 3 Plus accepts EcoFlow's extra batteries; with the 572 Wh Extra Battery 600 it becomes the 858 Wh River 3 Max Plus configuration.