He managed to build his own monitor using an Arduino. The trick of this build has to do with how the system works. The panel includes an LED light that blinks 1000 times for each kWh of electricity.

The brains are an Arduino glued to a large amount of solar support electronics and the online energy monitor component is covered by an ESP8266. The construction works quite well.

Read data from SRNE solar charge controllers via modbus over RS232. This repository contains several example programs for reading data from SRNE solar charge controllers using Raspberry Pi, ESP32, ...

This project aims to develop a solar and battery power management system using an Arduino Nano. The system prioritizes solar energy during daytime (in SUB mode) to power an inverter and charge a ...

I think the designers explain it better. B-Squares is a 3D modular, Arduino-compatible solar-based tool for artists, educators, inventors, and really anyone who makes things.