In order to sense the solar panel voltage a voltage divider was used to step it down, as it can be greater than the maximum voltage of 5V that the Arduino can handle and thus it can damage the board.

This is a project build for a Arduino based Solar MPPT charge controller.It has features like: LCD display,Led Indication, Wi Fi data logging and provision for charging different USB devices.It is ...

A few years ago, [Lukas Fässler] needed a solar charge controller and made his own, which he has been improving ever since. The design is now mature, and the High Efficiency MPPT Solar Charger ...