Solar Master is a free Android application developed by Afeef Inc. It is a comprehensive tool that facilitates the calculation of solar energy and electrical systems. With Solar Master, users can calculate the requirements of their solar system, determine the orientation and inclination of solar panels based on their geographical location, and calculate solar panels and batteries and connect them in series and parallel.

The app also helps users calculate the wire gauge used in the solar and electrical system, voltage drop, and convert between units of electricity. In addition, the app features an area calculator that calculates the number of solar panels that can be placed in a particular area, a pump calculator that calculates the required water pump based on Moody chart and Darcy's equation, a notebook that can be used to keep daily notes, and a heater calculator that calculates the heater required to heat your pool, and much more.

Overall, Solar Master is a user-friendly and comprehensive tool that turns the average user and those who do not have enough experience into a professional.