Reactive power can be recorded using a formula register.


First, create a power register for the equipment monitored:


Next, click the power sub-type selector box to the right of the "P" box:

Choose "* Record apparent power" and press OK:



Finally, add a new register, change the "P" box to an equals sign for a formula register, choose "react. power [var]" as the unit, and enter a formula of:


VAr($"registername", $"registername*") 

where registername is the name of the power register. Note the asterisk (*) on the end of the second register name, this references the apparent power register.