Wireless solar power meter

I own a small solar system. 2 months ago I added a battery system. I do not want to feed energy into the public power grid. I want to use all the energy from my panels by my own. Energy not used by my household should be stored in the batteries and if I need more power then my panels can deliver, the difference should come out of the batteries. To control this logic I need correct measurements of the solar production and the power consumtion of my house. The total power consumtion is taken from my central power meter. Since my panels are connected directly to the batteries (batteries have bms, charger and mppt) and my batteries have only an instable cloud service for live data, I designed my own power meter for the panels.

I used:

• ESP32-S2 Zero with Tasmota
• LM2576HV Step-Down module
• WCS1800 current sensor
• 2 resistors as voltage divider

The ESP32 uses Tasmota as software and sends the measurements via mqtt to my home automation system. Power for the ESP32 is taken directly from the solar panel.

The case is printed in ASA and after a function test the 2 parts of the case are glued together using super glue.