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 small panel mount DC digital voltmeter’s red wire will be attached to the Arduino’s 5-V pin. Arduino’s ground will be wired to the small panel mount DC digital voltmeter’s black wire. Figure 2 ...