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Home Assistant.
Move your Google Home Mini into the room with the freezer and put it on the same circuit, and set up an Automation that triggers on the state moving to "Unavailable".
The only potential hard bit is figuring out how you want it to notify you. Most of the built-in ways assume notifying some other device, i.e. play media, flash lights, etc.
If you want it to do something like "send me a text message" or "page me", then you'd need to add things like a Prometheus export to Grafana Cloud (free tier) and then use Grafana Alerting to notify yourself, or to trigger Grafana On-Call so that you actually get paged when the power in your outbuilding has been tripped.
I would probably go the overkill way as I like Grafana (and work for them)... but hey, you can achieve the basics with just Home Assistant.
Velocio-
Home Assistant
Sorry if this is a stupid question, but when putting Home Assistant on a pi - am I right in understanding that the whole pi needs a dedicated Home Assistant OS and that it will be exclusively operate as a Home Assistant?
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The only potential hard bit is figuring out how you want it to notify you
Nah easy - if you have the Home Assistant app on your phone you can receive a notification triggered by the automation.
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If you want it to do something like "send me a text message" or "page me", then you'd need to add things like a Prometheus export to Grafana Cloud (free tier) and then use Grafana Alerting to notify yourself, or to trigger Grafana On-Call so that you actually get paged when the power in your outbuilding has been tripped.
I used to use Pushbullet for this which was pretty nice.
Home Assistant app can also do it but obviously you need a bit more setup if you want it to work away from home.
hugo7
Fox
aggi
We have a freezer in an outbuilding plugged into a wall socket. Recently the power is being tripped to the building. When this happens there is no impact to my house or the home Internet. Sometimes it trips the fuse for the out building circuit in the house fuse box, sometimes in the fuse box for the outbuilding.
I want to be alerted when there is no power to the freezer. I don't want any sort of subscription plan.
What do I need?
Google seems to thow too many ads to be useful.
If it makes a difference I have a Google Home Mini and we have android phones. I don't have tonnes of free time, but I do have a spare raspberry pi zero if there is a simple solution there.