Energy harvest from Current Transformer and store in a Supercapacitor. Simulation and PCB. See https://www.ti.com/lit/ug/tidud59/tidud59.pdf

This is a simple charger modul that can be connected to a DC generator or solar panel at the input and a battery at the output

Ultra-Low-Power Solar CO₂ Monitor with Programmable LoRa-E5, Low-Power I²C CO₂ Sensor, MPPT Solar Input and 10-Year Battery Life #co2 #lowpower #mppt #solar #lora #stm