Design and simulation of an independent solar home system with battery backup

This paper presents a detailed design of an independent solar home system for a typical residential building in the southern part of Bangladesh, Khulna. The system is composed of a Photovoltaic array, Maximum Power Point Tracker (MPPT) Controller, DC-DC buck converter, charge controller, inverter and lead acid battery. The modelling is carried out by estimating the required load, selecting and determining the proper specifications of the components involved in the system. Various factors such as the geographic location, climate condition, solar irradiance and load consumption upon which the whole work depends are all considered in this work. The daily average load demand is found to as 8.730 kWh/day which can be met by an array of 17 solar panels with a backup of 12 units of the battery having a capacity of 3031.25 Ah. The system is implemented in MATLAB/SIMULINK platform with the solar radiation on a sunny and wintery day. Simulated results indicate that the proposed model meet the load demand and show satisfactory performance.