How long will the EcoFlow RIVER 3 Plus run a Wi-Fi router + cable modem?

About 9.5 hours from a full charge. A Wi-Fi router + cable modem averages about 25 W, and the 286 Wh battery gives about 243 Wh after inverter losses. That is 10% of the battery an hour.

Can I run other things at the same time?

Yes, up to about 575 W more of the 600 W output. Each thing you add shares the same battery, so the 9.5 hours for a Wi-Fi router + cable modem gets shorter.

How much of the battery does a Wi-Fi router + cable modem use in a day?

About 600 Wh a day (25 W × 24 hours), more than the 243 Wh the EcoFlow RIVER 3 Plus can deliver, so plan to recharge every 9.5 hours.

EcoFlow · Will it run?

Can the EcoFlow RIVER 3 Plus run a Wi-Fi router + cable modem?

Published October 11, 2026

Short answerYes

Yes. The EcoFlow RIVER 3 Plus runs a Wi-Fi router + cable modem for about 9.5 hours from a full charge. At about 25 W on average it uses 10% of the battery an hour, and the 600 W output leaves plenty of room for more.

Add your other devices

Key numbers

Runtime: 9.5 hrs; from a full charge
Battery used per hour: 10%; at 25 W average

Wi-Fi router + cable modem

Running: 25 W; 10–66 W range
Start-up: 25 W
Average: 25 W; runs all the time

EcoFlow RIVER 3 Plus

Battery: 286 Wh; about 243 Wh usable
Output: 600 W; continuous
Surge: 1,200 W; start-up peak

How we worked it out: 286 Wh × 0.85 ÷ 25 W = about 9.5 hours. The 0.85 covers inverter and battery losses. We do not test units ourselves; the numbers come from the official spec sheets and typical device draws. How we pick

EcoFlow RIVER 3 Plus

286 Wh · 600 W output · 1,200 W surge · 10.4 lb

Full specs and runtimes

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What else the EcoFlow RIVER 3 Plus runs

One device at a time, from a full charge.

Other power stations for a Wi-Fi router + cable modem

The nearest sizes that also run it.

Keep going

Real runtime depends on the model you own, room temperature and battery age. The 9.5 hours above is an estimate, not a measured result.

Common questions

How long will the EcoFlow RIVER 3 Plus run a Wi-Fi router + cable modem?: About 9.5 hours from a full charge. A Wi-Fi router + cable modem averages about 25 W, and the 286 Wh battery gives about 243 Wh after inverter losses. That is 10% of the battery an hour.
Can I run other things at the same time?: Yes, up to about 575 W more of the 600 W output. Each thing you add shares the same battery, so the 9.5 hours for a Wi-Fi router + cable modem gets shorter.
How much of the battery does a Wi-Fi router + cable modem use in a day?: About 600 Wh a day (25 W × 24 hours), more than the 243 Wh the EcoFlow RIVER 3 Plus can deliver, so plan to recharge every 9.5 hours.