Thank you much. I saw that post and it seemed to be that if you already have a 12 digit identifier, then that post does not apply. If you have a 12.digit identifier and the board is actually registered, then it seems you are stuck with a board you cannot register. I’m waiting for a response from technical support to see if there is a way to de-register a board.
How accurate do you find the Shelly EM, as it uses CTs?
Their documentation says it’s B class. (IEC 62053-21)
1%.
I stumbled on the Eastron SDM230-WiFi which potentially avoids the need for something to decode the m-bus/modbus data when using it with Home Assistant.