Just a quick update. The Power Monitor works almost a year without severe issues. As I expected, the OLED started to fade, so switching the display off base on a light sensor (or whatever) is essential (but won't be implemented in this hardware version).

As I'm playing with Home Assistant, I decided to add auto-discovery to the device to simplify integration. New options on the settings page:

And this is how HA displays it:

Additionally, many bug fixes were added recently to improve stability and code quality. BTW, the charts were entirely removed.

That's all for now.