Device wattage guides
How Many Watts Does a Wi-Fi Router Use?
A router and modem are small loads, but keeping them online can be useful during short outages if the internet service remains active. The total depends on whether you have a separate modem, router, mesh nodes, or fiber terminal.
Typical wattage ranges
| Load | Watts | Planning note |
|---|---|---|
| Wi-Fi router | 6-20 W | Mesh routers and high-performance models may be toward the upper end. |
| Cable modem or fiber ONT | 6-25 W | Internet equipment often needs both the router and provider device powered. |
| Router plus modem | 15-45 W | Use this combined estimate when planning UPS runtime. |
Runtime example
With a 300 Wh battery, a 30 W load, 85% efficiency, and a 15% reserve, the planning estimate is about about 7.2 hours.
Internet availability also depends on your provider's network staying powered.
Planning tips
- Include modem, router, mesh nodes, switches, and fiber terminals that must stay on.
- Use a UPS for seamless short outage coverage if you need internet continuity.
- Avoid backing up nonessential network gear to stretch runtime.
- Check DC barrel connector voltage before using any direct-DC backup cable.
Safety and limits
- Use power adapters that match the equipment voltage and polarity.
- Do not overload a small UPS with printers, heaters, or other high-wattage loads.
- Backup power cannot guarantee internet service if upstream equipment is offline.
FAQ
Will a UPS keep my internet working?
It can keep your local equipment powered, but service also depends on the cable, fiber, or wireless provider network.
How many watts should I use for router backup planning?
For a modem and router together, 15 to 45 watts is a practical planning range for many homes.
Should I plug a printer into the same UPS?
Usually no for runtime planning. Printers can draw much higher power and may shorten backup time significantly.