EcoFlow RIVER 3 Plus vs Anker SOLIX C300X

Q: Can either run a small appliance during a power cut?

The EcoFlow RIVER 3 Plus lists 600W continuous and a 1200W X-Boost figure. The Anker SOLIX C300X lists 300W. Check the wattage label on your appliance before counting on either. Lights and a mobile phone fit both. Anything above 300W rules out the Anker on paper.

Q: Which one keeps a router running longer?

Both hold about the same energy at 286Wh and 288Wh so runtime on a small load is similar. The EcoFlow RIVER 3 Plus adds a stated UPS switchover under 10 ms and two rear AC outlets for UPS cabling. The Anker SOLIX C300X data gives no UPS figure. For a router that must not drop the EcoFlow states the feature.

The EcoFlow RIVER 3 Plus and the Anker SOLIX C300X both hold about 287Wh. The duel is about output and expansion against a listed 140W two-way USB-C port and a 5-year warranty.

Updated October 6, 2026

Our pick

EcoFlow RIVER 3 Plus

7.9/10

A 286 Wh LiFePO4 unit at 4.7 kg rated for 600 W with a UPS under 10 ms.

EcoFlow UK Search Amazon.co.uk

Full specs, pros and cons

Anker SOLIX C300X

7.3/10

A 288 Wh LFP unit rated for 300 W with 140 W two way USB-C and seven ports.

Search Amazon.co.uk

Full specs, pros and cons

The short answer

The EcoFlow RIVER 3 Plus fits more buyers. It doubles the output at 600W against 300W and takes an extra battery. Its solar input is rated at 220W against 100W. The Anker SOLIX C300X answers with a listed 140W two-way USB-C port and a 5-year warranty.

Choose the EcoFlow RIVER 3 Plus if

you want 600W of output rather than 300W
you want to expand to 858Wh with an extra battery
you want a stated UPS switchover under 10 ms

Choose the Anker SOLIX C300X if

a stated 5-year warranty matters to you
you want a listed 140W two-way USB-C port

Specs side by side

EcoFlow RIVER 3 PlusAnker SOLIX C300X

Shortlist score7.97.3

Capacity286 Wh288 Wh

AC output600 W300 W

BatteryLiFePO4LFP

Cycle lifemaker's rating3000 to 80%-

Solar input220 W100 W

UPS switchover<10-

Weight4.7 kg (10.4 lb)-

Wall charge timemaker's claim0-100% in 60 min (360W AC input)80% in 50 min

EcoFlow RIVER 3 Plus

Pros

A UPS under 10 ms is listed with two rear AC outlets meant for UPS cabling.
An extra battery takes it to 858 Wh without wires per the maker.
Noise is listed under 30 dB.

Cons

With 286 Wh it holds far less than the 1 kWh units here.
Its 600 W continuous rating sits well below the 1,500 W and up listed for most units here.

Anker SOLIX C300X

Pros

A 140 W USB-C port charges a laptop and refills the unit.
The maker lists a five year warranty.
Noise is listed at 25 dB at 1 m.

Cons

A 100 W solar input is modest so a refill from panels takes time.
With 288 Wh and 300 W it suits phones and a router rather than mains appliances.

Frequently asked questions

Can either run a small appliance during a power cut?

The EcoFlow RIVER 3 Plus lists 600W continuous and a 1200W X-Boost figure. The Anker SOLIX C300X lists 300W. Check the wattage label on your appliance before counting on either. Lights and a mobile phone fit both. Anything above 300W rules out the Anker on paper.

Which one keeps a router running longer?

Both hold about the same energy at 286Wh and 288Wh so runtime on a small load is similar. The EcoFlow RIVER 3 Plus adds a stated UPS switchover under 10 ms and two rear AC outlets for UPS cabling. The Anker SOLIX C300X data gives no UPS figure. For a router that must not drop the EcoFlow states the feature.

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