kWh are not recognized as Energy values

[kaikreuzer]

The recently introduced unit support has an "Energy" dimension defined, which uses by default the SI unit "J" (Joule).
In practice, the alternative "Wh" are used much more frequently and thus I would expect this unit to be usable for items with Energy dimension.

I defined an Item like this:

Number:Energy Energie			"Energie [%.1f kWh]"

Sending a value on the console

smarthome send Energie 123.456

results in

2018-04-03 13:27:05.491 [DEBUG] [.e.s.core.types.util.UnitUtils:108  ] - Unknown unit from pattern: kWh

and no unit being assigned to the item state.

As energy is likely the most common use case besides weather for units, I'd consider this a rather critical issue that needs to be addressed quickly. See also https://github.com/openhab/openhab2-addons/pull/2167#discussion_r178578851.

[J-N-K]

I have created a patch for that. Please note, that kW·h is the correct notation, not kWh.

[ggzengel]

https://de.wikipedia.org/wiki/Wattstunde

[ggzengel]

I was a little bit more searching and found here https://en.wikipedia.org/wiki/Kilowatt_hour:

The symbol "kWh" is commonly used in commercial, educational, scientific and media publications,[5][6] and is the usual practice in electrical power engineering.[7]

The main usage in OH2 is for reference of electrical power, so I would like to see (k)Wh.

[ggzengel]

Now the last one:
http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=131-11-58

[kaikreuzer]

Please note, that kW·h is the correct notation, not kWh

kWh, just like Wh and Ws must be supported. As @ggzengel rightly pointed out, these are also the officially used unit identifiers.

[J-N-K]

I‘ll see what can be done about that.

[ggzengel]

Does this help?
https://www.programcreek.com/java-api-examples/?code=unitsofmeasurement/uom-demos/uom-demos-master/domain/energy-se/src/main/java/tec/uom/demo/energy/se/HeatRequirementDemo.java

[J-N-K]

Thanks. I already found a solution.