> what software do you recommend for gnu/linux to take input from the UPS to tell the laptop to shutdown? https://networkupstools.org/. - Source: Hacker News / 8 months ago

The Synology software is based on N.U.T. https://networkupstools.org and the Plus 1100 (listed on NUT as the Easy Power 1200) is supported in the native package with the 'blazer' driver. If you have the skills, I would SSH into the NAS and see if the device is 'noticed' or better yet recognised by the USB sub-system when you plug it it. (Normal Linux would use the lsusb command to see devices but I have no NAS... Source: 11 months ago

Others have answered the hardware part of your question. I have not seen much mention about the software to control graceful shutdowns. For this I suggest you look at the ”Network UPS Tool” (NUT for short) project (https://networkupstools.org/). It is mostly manufacturer agnostic with clients for a vast array of hardware components. Source: 11 months ago

Network UPS Tools is one option: https://networkupstools.org/. Source: 11 months ago

So no, the NAS does not monitor the battery level. The UPS does that. The NAS just acts on the messages it receives from the UPS via Synology's version of NUT - Network UPS Tools (https://networkupstools.org/). The NAS will first receive the ON_BATTERY/POWERFAIL signal. Then, eventually the BATTERY_LOW signal at which time the UPS will shutdown. So you really need to set a time for it to shut down *BEFORE* you get... Source: 12 months ago

Maybe try some better Battery APPS BetterBatty Stats https://forum.xda-developers.com/t/app-2-2-05-oct-v2-4-betterbatterystats.1179809/ Gsam battery Monitor ( the "app sucker" stats are best) https://gsamlabs.com/ AccuBattery (very nice to look at) https://accubatteryapp.com/. Source: about 3 years ago