EcoFlow RIVER 3 EFR705

Photo from the manufacturer

Ultraportable F1 · Outlet-sized (up to 1 kWh)

EcoFlow EcoFlow RIVER 3

Name: EcoFlow RIVER 3
Brand: EcoFlow
SKU: EFR705
Author: JouleSpecs

Estimated price range

200–450 € ≈ $216–$486

An editorial estimate, not a selling price

JouleSpecs does not sell and does not show shop prices: check the price where you buy.

Where to buy

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Sheet on the EcoFlow website →

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Data from official source

Sheet curated by JouleSpecs — We check every spec sheet against the manufacturer's own documentation: each value carries its source and the date we read it. Published Sept. 21, 2026 · Last updated Sept. 21, 2026 · Data verified Sept. 21, 2026

EcoFlow RIVER 3 is an ultraportable lithium iron phosphate power station that fits in a backpack or on a car seat. There's only one AC outlet, and the power is that of a laptop, a modem, a few lights: its measure is a day out, not a home.

Left connected to the grid it acts as backup, and when power is missing the switch to the battery is fast enough that work on a computer doesn't get interrupted; as long as the grid is there, current passes straight to the appliances and the charge stays where it is. To start a small motor or a heating element that needs more than it gives continuously, a dedicated function raises the power ceiling for a moment.

It charges from the outlet, a portable panel or the car's cigarette lighter socket, and works quietly enough to stay on in a room where someone's sleeping. It suits anyone who travels often and wants a light reserve for the computer, the modem or the lights; anyone thinking of a fridge needs a larger size.

01 · Verified data

Technical specifications

Cell chemistry LFP (lithium iron phosphate)

Continuous output 300 W

Cost per kWh 1057,14 €/kWh

official manufacturer list price — on nominal capacity

Round-trip efficiency EcoFlow does not state it.

where we looked

Standby consumption EcoFlow does not state it.

where we looked

Parameter	Value	Source
Dimensions	25.5 × 21.2 × 11.3 cm (10.0 × 8.3 × 4.4 in)	manufacturer website
Weight	3.5 kg (7.7 lb)	manufacturer website
Nominal capacity	0.245 kWh	Declared by the brand
Cell chemistry	LFP (lithium iron phosphate)	Declared by the brand
Continuous output	300 W	Declared by the brand
Peak output	600 W	Declared by the brand
AC outlets	1	Declared by the brand
Fastest USB-C	100 W	Declared by the brand
Maximum charge power	0.305 kW	Declared by the brand
Maximum solar input	110 W	Declared by the brand
Backup power	UPS	Declared by the brand
Switchover time	10 ms	Declared by the brand
Rated cycles	3000 cicli	Declared by the brand
Capacity at end of cycle life	80 %	Declared by the brand
Warranty	2 anni	Declared by the brand
Mounting	Portable	Declared by the brand
Noise level	30 dB	Declared by the brand
Official list price	259 €	Declared by the brand
Usable capacity	—	Not declared
Depth of discharge	—	Not declared
Cell supplier	—	Not declared
Expandable	—	Not declared
Maximum expanded capacity	—	Not declared
Peak duration	—	Not declared
0–80% charge time	—	Not declared
Guaranteed throughput	—	Not declared
Guaranteed remaining capacity	—	Not declared
Round-trip efficiency	—	Not declared
Standby consumption	—	Not declared
Ingress protection	—	Not declared
Minimum temperature	—	Not declared
Maximum temperature	—	Not declared
Cell heating	—	Not declared
Wheels and handle	—	Not declared
Works without internet	—	Not declared
Local control	—	Not declared
Open protocols	—	Not declared
Home Assistant integration	—	Not declared
Where the data is hosted	—	Not declared
Remote updates	—	Not declared
App required for setup	—	Not declared
Declared standards	—	Not declared

Which documents this page rests on

EcoFlow RIVER 3 Portable Power Station User Manual en 20240911-20241112-1 32 rows of the table · file hosted on cdn.solarpowersupply.eu

The rest of the data comes from 2 pages on the manufacturer's site, cited row by row in the table above.

A manual or a datasheet counts as a source even when the original file is hosted elsewhere: what matters is the document, not the server. Where that happens, it is stated above.

02 · The numbers

What it really costs

Cost per kWh 1057.140 €/kWh official manufacturer list price — on nominal capacity

How we worked it out

price: 259
nominal capacity: 0.245

Battery life cycles 730 cycles warranty years

the manufacturer does not state the guaranteed total energy throughput, which for heavy users is often the limit that runs out first

How we worked it out

stated cycles: 3000
warranty years: 730

Cost of stored energy 1.448 €/kWh warranty years

the manufacturer does not state the guaranteed total energy throughput, which for heavy users is often the limit that runs out first
on nominal capacity: the manufacturer does not state the usable figure, so the real cost is higher
without conversion losses, which the manufacturer does not state: the real cost is higher

How we worked it out

price: 259
nominal capacity: 0.245
battery life cycles: 730
round-trip efficiency: 100
energy delivered over the whole life: 179

Energy density 70 Wh/kg

on nominal capacity: the manufacturer does not state the usable figure, so the true number is lower

How we worked it out

nominal capacity: 0.245
weight: 3.500

Power-to-capacity ratio 1.220 C

on nominal capacity: the manufacturer does not state the usable figure, so the true number is lower

How we worked it out

continuous power: 300
nominal capacity: 0.245

These numbers are calculated, not stated: they have no source to cite, they have a formula you can redo. The price used is the manufacturer's list price, which is stable and the same in every country — not a shop's price on the day.

03 · Summary

Pros and cons

In favour

Power goes missing and work on the computer continues: the switch to the battery is invisible.
As long as the grid is there, current passes straight to the appliances, and the charge stays where it is.
It starts a small motor that at startup needs more than it gives continuously.
Under thirty decibels: it stays on in a room where someone's sleeping.

Worth knowing

Only one AC outlet: for two plug-in appliances together, a power strip is needed.
The capacity covers a modem and a few lights for a few hours, not a fridge running continuously.
Two years of warranty: it's the promise that runs out first, well before the stated cycles.

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