The renewable energy is a source of energy that does not deplete with time, because of this most of the research focused on this source of energy. Solar energy is among the renewable energy that is free in nature and clean from pollution, but harnessing this energy has limitation due to some environmental conditions. To solve this problem, solar tracking is used. This paper intended to review different solar tracking system that increases the solar power output. The result revealed the solar system with tracking is more efficient compared to that fixed solar system. Furthermore, dual axis tracking system is also more efficient than single axis tracking system due to the fact that dual axis tracking system have ability to track the solar irradiant on both axes. Finally, it is not recommended to use solar trackers with small PV arrays because of the energy consumption of the driving systems, which vary from 2% to 3% of the energy increase delivered by the solar trackers.

Renewable energy systems are becoming widespread in the future due to adverse environmental friendly and abundant in nature. Solar and wind energy resources are alternative to each other which will have the actual potential to satisfy the energy demand. But wind energy system may not be technically viable at all sites because of low wind speeds and being more unpredictable than solar energy. Due to this reason a combined utilization of these renewable energy sources are therefore becoming increasingly attractive and are being widely used as alternative of oil-produced energy and this is called "Hybrid Renewable Energy Systems. These hybrid energy systems are becoming popular in remote area power generation applications due to advancements in renewable energy technologies and substantial rise in prices of fossil fuel. This paper presents an extensive review on hybrid renewable energy systems configurations, mathematical modeling and control strategies of the system. This Paper also highlights the optimization techniques which have the potential to increase the economic attractiveness of the system.

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Energy is one of the prime mover of mankind and need of the energy is always increasing at the same time the sources of energy are depleting with respect to time. Because of these reasons, energy expert thinks of other sources of energy that are sustainable, among which solar energy is the freely renewable energy source and it is abundant in nature. This paper tend to design a stand-alone solar energy generation for a medium house in Kano state Nigeria, the results of the research revealed that a 300W solar PV array capacity of 30 modules, 22 (140Ah, 12V) batteries and 4 (90A, 202-253V) voltage regulator are needed to supply the electrical load of the house. The overall cost estimate of the system was ₦886,032 which is relatively high when compared to that of fossil fuel generator used by the house but the payback period of the system is estimated to be 2 years 4 months, which is obviously much shorter than the lifespan of the selected PV modules which is 30 years.