Rock-Solid Internet, Even When You're Away

The problem

Home internet usually fails in one of two ways. The power blips, so the modem and router restart and sometimes come back confused. Or the provider has a hiccup, and the modem never fully reconnects until someone unplugs it and plugs it back in.

That's a small annoyance at home. Away from home, it's a real problem: cameras, thermostats, alarms and smart locks go offline, and there's nobody there to "turn it off and on again."

What you need

• A pure sine wave UPS (battery backup). It keeps the modem and router running through power blips and short outages. "Pure sine wave" models produce clean power, like the wall outlet, which some electronics' power adapters handle better than the cheaper "simulated" kind.
• An automatic router rebooter. This is a small smart plug your modem plugs into. It checks the internet every few minutes, and if the connection stays down, it power-cycles the modem for you, just like unplugging it. Good ones can text or email you when they step in.

How it works

Plug the router straight into one of the UPS's battery-backed outlets. Plug the rebooter into another battery-backed outlet, and the modem (or fiber box) into the rebooter. That way the rebooter only ever restarts the modem, and your Wi-Fi stays up the whole time. If your provider gave you a single box that does both jobs, plug that box into the rebooter.

Now:

• Power blinks: the UPS covers it. Nothing restarts, and nothing notices. My UPS's display once showed it had handled 86 power events.
• Longer power outage: the UPS keeps the internet up for a while. Mine carried the modem and router through a 30-minute outage without a single internet blip.
• The provider has a problem: the rebooter notices the internet is gone, waits, and power-cycles the modem. If the service is still down, it waits and tries again later.
• Service comes back: the modem reconnects cleanly, without anyone touching it.

Setting it up

1. Size the UPS for your equipment. A modem and router use very little power, so a mid-size unit runs them a long time. Check the maker's runtime chart.
2. Use the battery-backed outlets, not the "surge only" ones.
3. Set up the rebooter using its instructions: how often it checks, how long it waits before restarting, and where to send alerts.
4. Test it. Unplug the internet cable from the wall, wait, and watch the rebooter do its job. Then unplug the UPS's own cord from the wall and confirm the internet stays up.

One thing to know: during a long provider outage, a rebooter keeps trying periodically until service returns. That's harmless, but set its timing so it waits a few minutes between tries rather than restarting the modem over and over.

Upkeep

• UPS batteries wear out, usually every 3–6 years. Most units beep or show a warning when it's time. I replaced mine after almost five years; the replacement battery cost about $55 and took about 20 minutes.
• Read the rebooter's alerts. An occasional restart is the system doing its job. Frequent ones are worth a call to your provider.

Keep Connect also offers an optional online service. I use it to get a text when my freezer or sump pump loses power, even when the whole house is dark. See Know Right Away When the Freezer or Sump Pump Loses Power.

What it doesn't fix

• A long provider outage: it reconnects when service returns, but can't create service.
• Weak Wi-Fi in parts of the house. That's a different project.
• A power outage longer than the UPS's battery lasts.

The result: an internet connection that mostly takes care of itself, and one less thing to worry about.

Products named here are ones I bought and use myself. No sponsorships, no affiliate links.
I'm not a licensed electrician or other professional. Follow the product instructions and local codes, and call a qualified pro if you're unsure. Full disclaimer.