https://vb.net/en/uninterruptible-power-supplies-upss-?p=2
Uninterruptible Power Supplies (UPSs)
power suppliesupss
https://alioth-lists.debian.net/pipermail/nut-upsuser/2017-October/010955.html
[Nut-upsuser] Email Alerts for Multiple UPSs with upssched
email alertsnutmultipleupss