Home Assistant Modbus Integration:
https://www.home-assistant.io/integra...

Modbus explenation material:
https://www.overdigit.com/data/Blog/R...

Elfin-EW11 manual:
https://eniris.be/wp-content/uploads/...

Merlin Gerin Shneider PM9C Energy Meter manual:
https://shmmetershop.co.uk/wp-content...