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

About 35 hours from a full charge. A Wi-Fi router + cable modem averages about 25 W, and the 1,024 Wh battery gives about 870 Wh after inverter losses. That is 2.9% of the battery an hour.

Can I run other things at the same time?

Yes, up to about 1,775 W more of the 1,800 W output. Each thing you add shares the same battery, so the 35 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), 69% of the 870 Wh the EcoFlow DELTA 3 Plus can deliver.

EcoFlow · Will it run?

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

Published October 11, 2026

Short answerYes

Yes. The EcoFlow DELTA 3 Plus runs a Wi-Fi router + cable modem for about 35 hours from a full charge. At about 25 W on average it uses 2.9% of the battery an hour, and the 1,800 W output leaves plenty of room for more.

Add your other devices

Key numbers

Runtime: 35 hrs; from a full charge
Battery used per hour: 2.9%; 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 DELTA 3 Plus

Battery: 1,024 Wh; about 870 Wh usable
Output: 1,800 W; continuous
Surge: 3,600 W; start-up peak

How we worked it out: 1,024 Wh × 0.85 ÷ 25 W = about 35 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 DELTA 3 Plus

1,024 Wh · 1,800 W output · 3,600 W surge · 27.6 lb

Full specs and runtimes

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What else the EcoFlow DELTA 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 35 hours above is an estimate, not a measured result.

Common questions

How long will the EcoFlow DELTA 3 Plus run a Wi-Fi router + cable modem?: About 35 hours from a full charge. A Wi-Fi router + cable modem averages about 25 W, and the 1,024 Wh battery gives about 870 Wh after inverter losses. That is 2.9% of the battery an hour.
Can I run other things at the same time?: Yes, up to about 1,775 W more of the 1,800 W output. Each thing you add shares the same battery, so the 35 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), 69% of the 870 Wh the EcoFlow DELTA 3 Plus can deliver.