So I was working on a monitoring system for solar inverters , whereby I can measure the inverter output voltage and current, and also measure the Grid input voltage also, from it I can get the power consumed and also the energy used, to measure the parameters using my MCU, I used differential amp to measure the voltages, the video below is my voltage at my ADC pin, when Grid is available and the inverter is running, I used an offset to ensure the microcontroller captures the positive and negative voltage. S o at 260v the scope VMAX will be around 3.1v. currently my inverter output is 220v. The image attached is the schematic for reading the AC voltage