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Router DC UPS

Bench build · Systems and capstones · Intermediate · about 20 minutes

Keeps a 12 V router running through a power cut. A DC UPS module sits between the 12 V adapter and the router. With mains present it feeds the router and charges a 3S Li-ion pack; when the mains fails it switches to the pack within milliseconds, so the internet stays up through a brownout.

Router DC UPS: the finished build running on the simulator's bench

Build it in the labGuided build, test sheet and fault finding, free in your browser.

Parts list

Test procedure

Each test has an expected value and a pass range, like a factory test sheet:

  1. Mains on: router running
  2. Mains on: output
  3. Power cut: router keeps running

How it works

What it does: Keeps a 12 V router running through a power cut.

Build it (guided or ready-made), then run its test procedure below. Every test has an expected value and a pass range, just like a factory test sheet.

Background

The single most popular upgrade for home internet in the Philippines during rotating outages.