The daily electrical load used in this study is taken from the work of Og – bonna et al. . They reported in detail the domestic energy consumption patterns in Jos, northern Nigeria. From a typical daily electricity consumption profile for this location (see Fig. 3), two prominent peak demand periods can be observed in daily electricity load profile from this figure and they occur in the morning, between 06.00 and 09.00 and; late in the evening, between 19.00 and 21.00. These electrical load peaks are due to usual morning activities (e. g., cooking of breakfast, lighting), and cooking of supper, lighting, TV, reading (in the evening/night).
They also noted that there is an insignificant difference between the daily electricity demand patterns for weekdays and weekends and the daily average demand is reported to be about 1 kW h. However, the simulation analysis carried out in this study is based on assumed electrical load of 750 kW h/day for an area with reliable electricity grid access. At an average consumption rate of 2.5 kW h per day, 300 households will be benefit from this installation. For this load profile, hourly and daily variations are taken as 15% and 25% respectively.
The proposed energy system comprises of solar energy conversion system (PV) and national electricity grid system. The schematic diagram of the solar PV and grid-connected system is shown in Fig. 4. Detailed descriptions of each component with the required input data are presented in the following sections.