OH3 Rules DSL Calculation for kWh - UoM?

[rossko57]

@Mark_VG

ShellyEM_MAINS_TotalEnergy.state as Number

It’s the “as Number” that caused your issue, by treating the Quantity Type values as plain Number values you lost the magic units-of-measurement handling capability.

More about this here, tips’n’tricks for Quantity types -

Working with Number:Temperature Items in rules

openHAB provides Quantity Type features, which can seem baffling. On top of that, Temperature type Quantities have a few quirks all of their own. These notes intend to guide the rules author. I’ve shown work examples in DSL rules language, see below for other scripts examples. All have similar features, if different syntax. Knowing what can be done is half the battle. What is a Quantity Type? Simply, Item states and rule variables may contain Quantities - that just means a number AND a unit …