How many watts does a Wi-Fi router + modem use?
Updated
Running watts
20 W
Starting watts
20 W
Energy per day
480 Wh
A Wi-Fi router + modem typically draws about 20 watts while running. At about 24 h of use a day, that is roughly 480 Wh per day. These are typical values from generator wattage charts: the label on your own appliance (or its EnergyGuide sticker) gives the exact figure.
What size generator do I need for a Wi-Fi router + modem?
Plan for at least 24 W: 20 W to get through the start-up surge, plus a 20% margin so the generator never runs flat out. Of the common sizes, a 2,000 W generator is the smallest that fits.
| Generator | Can it run a Wi-Fi router + modem? |
|---|---|
| 2,000 W | Yes |
| 3,500 W | Yes |
| 5,000 W | Yes |
| 7,500 W | Yes |
| 10,000 W | Yes |
| 15,000 W | Yes |
How long will a power station run a Wi-Fi router + modem?
Running continuously at 20 W, assuming 85% of the battery is usable. The station's AC output must also handle the 20 W start-up surge.
| Battery capacity | Runtime |
|---|---|
| 1,000 Wh | about 43 h |
| 2,000 Wh | about 3.5 days |
| 3,600 Wh | about 6.4 days |
Running more than one appliance?
Starting surges don't add up the way running watts do. Pick everything you want to power to get your real number.
Open the Generator Size Calculator for Your HomeFrequently asked questions
What size generator do I need to run a Wi-Fi router + modem?
At least 24 W: 20 W to cover the start-up surge, plus a 20% safety margin.
Can a 2,000 watt generator run a Wi-Fi router + modem?
Yes. 2,000 W covers its 20 W starting surge with room to spare.
Can a 3,500 watt generator run a Wi-Fi router + modem?
Yes. 3,500 W covers its 20 W starting surge with room to spare.
How long will a 1,000 Wh power station run a Wi-Fi router + modem?
About 43 h, assuming 85% usable capacity, as long as the station's AC output is rated for 20 W of surge.
Never run a generator indoors or in a garage: see the CPSC safety guide.