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

About 6 days from a full charge. A Wi-Fi router + cable modem averages about 25 W, and the 4,096 Wh battery gives about 3,482 Wh after inverter losses. That is 0.7% of the battery an hour.

Can I run other things at the same time?

Yes, up to about 3,975 W more of the 4,000 W output. Each thing you add shares the same battery, so the 6 days 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), 17% of the 3,482 Wh the EcoFlow DELTA Pro 3 can deliver.

EcoFlow · Will it run?

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

Published October 11, 2026

Short answerYes

Yes. The EcoFlow DELTA Pro 3 runs a Wi-Fi router + cable modem for about 6 days from a full charge. At about 25 W on average it uses 0.7% of the battery an hour, and the 4,000 W output leaves plenty of room for more.

Add your other devices

Key numbers

Runtime: 6 days; from a full charge
Battery used per hour: 0.7%; 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 Pro 3

Battery: 4,096 Wh; about 3,482 Wh usable
Output: 4,000 W; continuous
Surge: 8,000 W; start-up peak

How we worked it out: 4,096 Wh × 0.85 ÷ 25 W = about 6 days. 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 Pro 3

4,096 Wh · 4,000 W output · 8,000 W surge · 113.5 lb

Full specs and runtimes

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What else the EcoFlow DELTA Pro 3 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 6 days above is an estimate, not a measured result.

Common questions

How long will the EcoFlow DELTA Pro 3 run a Wi-Fi router + cable modem?: About 6 days from a full charge. A Wi-Fi router + cable modem averages about 25 W, and the 4,096 Wh battery gives about 3,482 Wh after inverter losses. That is 0.7% of the battery an hour.
Can I run other things at the same time?: Yes, up to about 3,975 W more of the 4,000 W output. Each thing you add shares the same battery, so the 6 days 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), 17% of the 3,482 Wh the EcoFlow DELTA Pro 3 can deliver.