Figured it out in the mean time, Domoticz only accepts counter information, no net energy readings.
Topic closed.

New to Domotics,so not sure is this is an old or off topic question. I got a MySensors interface from my Arduino to Domoticz working for a couple of days. For the Electrical energy usage and delivery , S_POWER type devices were created in Domoticz. These are then populated with V-WATT and V_KWH ...