Count every powered box
Your connection may depend on a router, modem, fiber terminal or additional equipment. Add each device that needs local power. Use its measured consumption where possible; a power-adapter rating can be a maximum rather than a typical load.
Small loads still have overhead
The default calculation adds 10W for power-station idle consumption. That is a planning allowance, not a measured specification for every model. It can be a large part of a small network load. Direct DC output may behave differently and needs the correct voltage, polarity and connector.
Backup power is only part of connectivity
A provider outage can interrupt service even while your router remains powered. If uninterrupted operation matters, verify the power station’s transfer behavior and your equipment’s tolerance; this runtime estimate does not certify UPS performance.
Example prepared October 11, 2026. No hands-on product tests are claimed.