Changes 2023/10/18:
New: Attribute maxToday stores maximum power of the day.
New: Attribute maxTotal stores maximum power since last reset.
New: Command resetMaxTotal sets maxTotal to current power.
Changed: Power [W] is stored as Integer (instead of Float).
Your inverter has a web interface; You can view this by entering the IP address in your web browser. (Take a look at your router settings if you don't remember the IP of your inverter.)
Of course all this works only after installing the Deye inverter (look at the docs).
Then simply enter the inverters IP address (something like "192.168.178.111") in my device driver.