detect if the power grid is down

Questions & Help
1

if I use a UPS to secure the operation of my system how do I get info that the power grid is down in my house

3

Look for an App to monitor your UPS,
there are multiple topic on the forum: Search results for 'ups' - Homey Community Forum

fe, [APP][Pro] Network UPS Tools (NUT)

4

If you can’t get a feed from your UPS, how about a light powered from a circuit next to a battery-powered light sensor. You could put both in an opaque box to improve sensitivity and hide the light.

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