The first step towards discovering potential savings involves measurement of power consumption.

The DC wattmeter is a smart meter for training facilities with a
24 V DC power supply and up to 120 W power consumption.
All measured values can be read out via data transmission with
the integrated Ethernet port. Power consumption is read out as
an analogue signal within a range of either 0 to 10 V DC
or 4 to 20 mA.