Solar based battery charging using Arduino Uno If you are planning to install an off-grid solar system with a battery bank, you’ll need a Solar Charge Controller. It is a device that is placed between the Solar Panel and the Battery Bank to control the amount of electric energy produced by Solar panels going into the batteries. The main function is to make sure that the battery is properly charged and protected from overcharging. As the input voltage from the solar panel rises, the charge controller regulates the charge to the batteries preventing any overcharging and disconnects the load when the battery is discharged. Types of solar charge controllers There are currently two types of charge controllers commonly used in PV power systems : 1. Pulse Width Modulation (PWM) controller 2. Maximum Power Point Tracking (MPPT) controller In this Instructable, I will explain to you about the PWM Solar Charge Controller. I have posted few articles on PWM charge controllers earlier too. The...