Renewable energy is a remarkable developing potential in Vietnam, in which Solar photovoltaic (PV) energy is rapidly invested by investors in and out of the country in recent years. Specially, the Solar radiation in Southern area is more tremendous comparing with other parts in Vietnam. Developing the PV energy is very essential and results in national economic, social and technical benefits. However, the state of uncontrollable developing rooftop PV in residential households and entrepreneurs affects national power system in the area. In this study, the potentials of rooftop PV energy in Hau Giang province – being located in Southern part and occupying about 0. 5% of total area in Vietnam (1, 608 km2)-is evaluated by statistical methods, analysist methods and online map-based applications. As a results, total rooftop suitable area and the average peak capacity PV power potential in Hau Giang province are approximately 15. 79 km2 and 1, 882. 3 MW/year, respectively. Besides, power system steady state stability is analysed via commercial software ETAP when connecting rooftop PV power station in Hau Giang province and a study case is proposed to verify economic and social effects Hau Giang provinece.

The Solar photovoltaic (PV) systems are facing serious problems due to unavoidable losses in their system, leads to more deviation of output power from the input power level. This effect is known as a mismatch effect and is available in PV systems. Many losses are encountered in PV system and it is difficult to minimize such losses. In this paper, the influence of thermal effect on the Solar PV system is considered and its influence on the performance of the operation, fill factor, open circuit voltage, and short circuit current, band gap level of various semiconductor materials, output power and efficiency are analyzed. The temperature effect of a Solar PV cell, while connecting in a 36 cells in a module is analyzed for the various connection configurations like Simple Series configuration (SS), Series- Parallel configuration (SP), Total-Cross Tied configuration (TCT), Bridge-Linked configuration (BL), and Honey Comb configuration (HC) using MATLAB software. An increase in the level of temperature for various connection configurations, correspondingly decreases their open circuit voltage and series resistance. Shunt resistance and current are may not fully affected due to temperature. Finally, this problem creates a heating effect in the Solar PV cell, so the life span of the photovoltaic panel is decreased gradually. While the temperature level increases, soldering points are affected and cell encapsulation is affects. Solar cell materials are changed their performance of operation, while there is a change in the band gap due to the effect of temperature.

The impact of Solar radiation and ambient temperature on Solar PV energy yield and its corresponding economic implication was investigated. The electrical load assessment was done by physical inspection through periodic visits to study location. Five different scenarios were investigated for two locations - Ogun and Bayelsa States: Case I considers the PV performance based on the  locations’ historical Solar radiation and temperature data, Case II considers  30 % increase in the Solar radiation data while the ambient temperature data remains fixed, Case III  focuses on when Solar radiation data is decreased by 30 % while the ambient temperature data remains constant, Case IV considers the Solar radiation data remains constant while the temperature values are  increased by 30 %, and Case V examined the same Solar radiation values with temperature data values being decreased by 30 %. The HOMER pro was used as the implementation tool, Electrical energy yield, Unmet electric load, Net present cost, Levelized cost, and Operating cost for Cases I, II, III, IV, and V in Ota, Ogun State were as follows: 28,659 kWh/y, 4.71kWh/y, $13,537, $0.166, 271.43kWh/y; 37,260 kWh/y, 1.63kWh/y, $12,417, $0.152, 290.43kWh/y; 20,058kWh/y, 3.22kWh/y, $15,663, $0.192, 293.14kWh/y; 28,659kWh/y, 4.71kWh/y, $13,537, $0.166, 271.43kWh/y; and 28,659kWh/y, 4.61kWh/y, $13,437, $0.156, 261.43kWh/y, respectively while similar trend was observed for Otuasega in Bayelsa State. The results of the analysis showed that the optimal performance of the PV module occurred at a higher Solar radiation and a lower ambient temperature.

In current study, a model is developed for a one-story building with specific dimensions, integrating photovoltaic panels and Trombe walls to generate electricity and reduce energy consumption. The location chosen for the study is Kermanshah, using real climate data from the Meteonorm software to ensure accuracy. The proposed system is constructed using the TRNSYS dynamic simulation program, supplemented by a plugin for simulating the building's physical properties. The goal is to analyze the power output of the panels, their energy efficiency, airflow velocity through the channel, and the building's exergy change resulting from the addition of the Trombe wall. Additionally, a parametric analysis is scrutinized over the previous year to examine the efficacy of duct depth on various functional aspects of the system. The findings reveal that the Solar panels reach their peak power generation during July and August, with a highest output of 207 kW. The exergy efficiency of the panels consistently exceeds their energy efficiency across different months, reaching up to 20% and 22%, respectively. Moreover, incorporating a Trombe wall leads to a 3% decrement in the building's cooling and heating load, with exergy efficiency peaking at a wall depth of 10 (cm). Increasing the channel depth is found to decrease the heating requirement while improving airflow through the channel.