: This paper deals with the implementation of a low-cost Maximum Power Point Tracker (MPPT) solar charge controller to constantly calculate and maintain the maximum amount of power from a solar panel using a DC/DC buck converter and a microcontroller. The MPPT algorithm has been implemented using an Arduino Uno with the incremental conductance method. The voltage and current of the panel are taken to the system using voltage and current sensors to track maximum power point. When irradiance and temperature are constant or slowly vary, the incremental conductance method tracks MPP steadily and calculates the operating point at which the battery is capable of producing maximum power. In this method, the controller provides the PWM signal to adjust the duty cycle to finally adjust the voltage. Adjustment is done by Buck converter. If the power increases, further adjustments in that direction are tried until power no longer increases. More over the system protected the battery from under charge and over charge. To do that two MOSFET (IRF250) and two Optocoupler (PC817) has been used. The proto type of the system has been developed and its performance has been studied. Finally, a cost analysis has been done to show its cost effectiveness.