That wont work you only measure the shelly EM. You have to put the clamp on the left live wire or right to your bulb
Many thanks for the pictures!
Unfortunately, the current to the lamp doesn’t flow through the current clamp! Only the (very small) current to supply the Shelly is measured. Pleas arrange the current clamp at the red wire leading to the lamp! Here’s a diagram to connect the Shelly EM correctly:
[Blockierte Grafik: https://smarthome-forum.eu/media/451-ar768-leistungsmessung-png/]
A bit more complicated due to the contactor used. But the contactor may be omitted…
Second issue: The graphs for Voltage and Power are stored in the cloud. Hence, it is shown after an hour accumulated data available.
Now it works perfectly. Thank you both. Much thanks.