Uninterruptible Power Supply

Synology DSM has already built in UPS support.

In DSM using an administrative account open Control Panel - Hardware & Power - UPS.

In the configuration you have the choice between “Synology UPS server” and “SNMP UPS”.

The bad news is, that “SNMP UPS” are mostly very expensive. Professional UPS devices from APC have a so called “smart slot” where a proprietary optional network card from APC can be installed. While these are available for the higher-priced devices, the cards alone sometimes cost more then the UPS device itself.

The good news is, “Synology UPS server” is nothing else then a hidden installation of Network UPS Tools (NUT). The same software we already use in our other devices, like server and Uninterruptible Power Supply.

This makes it easy to use “Synology UPS server” with non-Synology masters. The only thing to keep in mind, is that Synology uses a hard-coded values for UPS device name, the user and the password. This makes it easy for all Synology devices to connect to each other. The user just needs to provide the IP address.

The values are:

UPS device name


slave user name


slave password


On the NAS these are found in the file /usr/syno/etc/ups/upsmon.conf.

So any NUT master server can be used as “Synology UPS server”, as long as its UPS device is called “ups” and a slave user “monuser” with the matching password is present.

On the master this is set up in the /etc/nut/ups.conf by adding a section explicatively called [ups] as follows:

driver = usbhid-ups
port = auto

“Driver” and “port” values may vary according to your UPS device.

And in the file /usr/syno/etc/ups/upsd.users:

password = secret
upsmon = slave