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.

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, ...

How the Code Works The code continuously monitors the light level through a photocell connected to LIGHT_PIN (A0). It then calculates the resistance of the photocell, which changes with light ...

CGA monitors may not be an amazing technological advance these days, but they can generally be found very cheaply. Additionally, they have a DB-9 connector and work off of TTL ranges (0-5VDC) makin… ...

If you want to DIY solution to your energy consumption, here's how modders created a home energy monitor from an Arduino, some wiring, and a little custom code.