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Late 2014 Mac mini running Sierra connected to an APC BackUPS Pro 900. No special software has been installed to support the UPS.

At the moment I run pmset every minute to determine the power source, and trigger actions based on the results.

However, a dialog window pops up as soon as the Mac switches to backup power. I'm wondering if there is any way I can trigger based on anything else, given that macOS seems to be able to do so.

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Yes, using third party tools, like Power Manager, you can trigger scripts based on your UPS state.

Power Manager used to script a shut down when 30% of UPS left

Thirty party tools can monitor the UPS state through the IOKit and receive callbacks on state changes; thus avoiding polling.

If you are comfortable with shell script or AppleScript, Power Manager provides hooks for scripting your UPS in these languages.

I wrote Power Manager, so feel free to ask technical questions.

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    That is some serious scripting support. Appreciate the recommendation. However, it's not worth it for me to make this investment in software. I might see if I can build a simple command line tool using IOKit, thanks for that recommendation. – Rob de Jonge Feb 7 '17 at 16:52
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In System Preferences > Energy Saver, you will find an additional tab labeled UPS, which allows you to set specific Shutdown Options...

enter image description here

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  • Using that, thanks. But I want to run custom scripts that trigger when power switches to UPS and back to grid. – Rob de Jonge Feb 8 '17 at 2:42

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