What size power station do I need for Wi-Fi router / modem?
Wi-Fi router / modem
Default appliance profile before model-specific measurements.
At the default 15 W load running 24 hours per day, a Wi‑Fi router/modem uses about 360 Wh daily. Applying the stated inverter-efficiency, usable-capacity and reserve assumptions gives a nominal battery target of about 523 Wh.
The load’s listed startup demand is 15 W. Actual consumption may vary by about ±15% and by appliance model, settings and conditions; model-specific measurements are not provided, so a plug-in power meter or manufacturer energy label is preferable when available.
- Minimum sizing: Look for about 523 Wh nominal capacity and an inverter rated to cover at least 15 W of startup demand.
- Runtime reference: A 500 Wh station is listed at 26.4 hours of continuous draw, or about 1.1 days under the default profile.
- Decision note: This sizing covers only the router/modem profile; evidence is insufficient to size a complete household backup setup without the other loads and their simultaneous wattage.
Using the default load profile, wi-fi router / modem consumes about 360 Wh/day. A conservative one-day battery target is about 522 Wh nominal capacity, while the inverter should cover at least 15 W of startup demand.
Assumptions behind the calculation
- Running draw: 15 W
- Startup/surge: 15 W
- Default use: 24 h/day
- Duty cycle: 100%
- Usage uncertainty: ±15% before model-specific measurements
Actual energy use varies by appliance model, ambient conditions, settings and load. A plug-in power meter or manufacturer energy label is preferable when available.
Runtime by battery size
| Station capacity | Continuous-draw runtime | Default usage profile |
|---|---|---|
| 300 Wh | 15.8 h at continuous draw | 0.7 default-profile days |
| 500 Wh | 26.4 h at continuous draw | 1.1 default-profile days |
| 1000 Wh | 52.8 h at continuous draw | 2.2 default-profile days |
| 1500 Wh | 79.2 h at continuous draw | 3.3 default-profile days |
| 2000 Wh | 105.6 h at continuous draw | 4.4 default-profile days |
| 3000 Wh | 158.4 h at continuous draw | 6.6 default-profile days |
Use your actual household loads
The calculator combines this appliance with refrigerators, networking, pumps, medical equipment and other essentials so simultaneous wattage and motor startup are not ignored.