ESP32   Smart Meter.
Each program has a :
Access Point version >> ESP32 has it's own network
Station Mode version >> ESP32 integrated in your home WiFi network

First program
measuring data available on webpage

Second program
measuring data available on website
data also available on LCD screen if wanted
3 programmable digital outputs in function of available power from solar panels or on time base.
1 PWM output sends power to a boiler in function of available power from solar panels or on a time base

Third program
measuring data available on website
data also available on LCD screen if wanted
3 programmable digital outputs in function of available KW from solar panels or on time base.
1 PWM output sends power to a boiler in function of available power from solar panels or on a time base
Stores data on a SD card and displays them on a webpage.
data is stored on a hour, day, month and year base.
1 year of data is +/- 140 KB with a SD card of 16GB you can save several (hundred) years